WEBVTT
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We all have to eat, but it's becoming increasingly clear how crucial what you put on your plate is to you both in the short and long term.
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From fueling growth in childhood to optimising recovery after surgery, a well balanced diet is a cornerstone of good health.
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But what exactly makes up a good diet?
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It's more than just eating your greens.
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Today I'm bringing you the latest insights from specialist dietitian Nick Wray, who'll guide us through the components of a healthy diet and the shifts required for different stages of life.
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Whether you're managing patients or refining your own dietary advice, Nick This episode is packed full of practical insight you won't want to miss.
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Welcome to Aussie Med Ed.
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G'day and welcome to Aussie Med Ed, the Australian Medical Education Podcast.
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Designed with a pragmatic approach to medical conditions by interviewing specialists in the medical field.
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I'm Gavin Nimon, an orthopaedic surgeon based in Adelaide, and I'm broadcasting from Kaurna Land.
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I'd like to remind you that this podcast podcast players, and is also available as a video version on YouTube.
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I'd also like to remind you that if you enjoy this podcast, Please subscribe, or leave a review, or give us a thumbs up, as I really appreciate the support and it helps the channel grow.
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I'd like to start the podcast by acknowledging the traditional owners of the land on which this podcast is produced, the Kaurna people, and pay my respects to the Elders both past, present, and emerging.
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It's my pleasure now to introduce Nick Wray, a clinical dietitian with almost 30 years of experience in both hospital dietetics and private practice.
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He has extensive experience with sports teams and also in private practice.
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Wray Nutrition.
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And he specializes in gastro and obesity surgery, but also sees anyone who may need dietitian intervention.
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In the last five years, he's commenced a new business with another dietitian, Dr.
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Penny Taylor, a business called 360Me Nutrition, where they employ, mentor and train dietitians, placing them in various medical and allied health clinics around Adelaide.
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Welcome Nick, thank you very much for coming on Aussie Med Ed.
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Pleasure, Gavin.
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Good to be here.
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More and more during these podcasts, we get to interview different specialists and hear about how important the diet is to health.
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And so it's great to have you on board.
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Can you explain what the fundamental components of a well balanced diet are and why they're really important to overall health?
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Yeah, it's a tough question to start with because, you know, a well balanced diet varies enormously depending on the person's situation.
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You know, obviously, their age and their physical activity level and their Medical history, etc.
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But the basics.
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You've got to cover the macronutrients and the micronutrients.
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And that's the part that varies so much from individual to individual.
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So people who limit huge, you know, key food groups, like they cut out dairy or something like that, that does make our job as a dietitian a lot more difficult because it's, it's wiping out a lot of calcium and a lot of protein and things like that.
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So really the goal is to, I guess, provide enough Basic macronutrients to give that person their basic requirements, which is going to vary enormously from individual to individual.
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So, but as a rule, um, enough fruit and vegetables to get their vitamins and minerals, enough breads and cereals to get their carbs, enough protein foods to get their protein.
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So nothing's changed over a hundred years of this, but I think we've got better at bringing in all the variables of a person and As to how to achieve this because no two people are the same.
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Let's face, um, everyone's different.
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Perhaps you can just explain what a macronutrient is.
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Yeah.
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So your macronutrients are, are simply your, your protein and your fats and your carbohydrates.
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The basics for energy and for building blocks, blocks for protein and essential fats, et cetera.
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And then your micronutrients, of course, are your vitamins and your minerals.
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You know, the more restrictive a person's diet, the more difficult it is to achieve adequacy.
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So, basically, there's three main macronutrient groups, and you mentioned micronutrients too, what makes up those as well?
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Well, all your vitamins and minerals, you know, the basics are your iron and your vitamin D's for bone health and calcium for bone health and certainly in nutrition deficiencies we see quite a lot of these.
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Restrictive diets very often wipe out a lot of those micronutrients because, and that makes our life more difficult and then you have to rely more on.
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Nutrition supplements and things like that, which you can take a whole bunch of vitamins, but better to try and get it in your food.
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Right.
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So the two main areas are macronutrients, which provide protein, fat, and carbohydrates.
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Mm-Hmm.
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micronutrients is, are the vitamins and minerals which help you develop.
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What sort of levels of macronutrients are you needing in a basic diet that you wanna try and maintain?
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Like I've, I've gone pescatarian.
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How does that affect my.
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Maintenance of my general health, given the fact that I've reduced my meat intake, in fact, stopped my meat intake.
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Well, it does.
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I mean, this is where, um, you have to look at a person's, um, dietary restrictions or choices.
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Um, you know, it might just be their simple choices.
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As you said, you've chosen to go pescatarian.
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Well, that's fine.
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We can work around that easy enough.
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That's not difficult.
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Getting adequate protein is the goal and we can still achieve that.
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But if you, for example, decided to be vegan, that's more difficult again because We're very limited with how, how much protein we can get and we can pretty much cover most people's, you know, protein requirements and, and macronutrients if someone's very restrictive like a vegan would be.
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Unless they're then doing tons of exercise, um, that then becomes really difficult because their protein and energy needs are far greater.
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So, uh, N I M O N O N.
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Achieving that within the boundaries of them choosing to be vegan, um, becomes more challenging.
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So this is where you have to take every variable into account.
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What other food types can actually get protein from?
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I understand tofu is a very good source of it.
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Look, any animal product contains all the essential amino acids.
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And if you want to build new protein, you need all the essential amino acids.
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Vegetable protein will lack at least one essential amino acid, but if you combine different vegetable proteins, you can still get adequacy.
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So, It's not out of the question to be able to do that, it just makes our job as the dietitian a little trickier, but we can live with that.
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So it really boils down to how much exercise are you doing?
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What type of exercise are you doing?
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How old are you?
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What's your physical stature?
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Um, and then we can have a good feel for, right, well this person needs X grams of protein and how do we achieve that?
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Right.
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So as you exercise more, you need more protein because you're building muscle, is that correct?
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Well, particularly
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depending on the exercise, yes.
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Particularly if you're doing weight bearing type exercise, weights or running triathlons or, you know.
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Weightlifting etc.
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If you're more of an endurance athlete, well, hey, then we got to talk carbs, right?
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So then we have to talk petrol in the tank and that's what carbs are.
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So, you know, a carbohydrate requirement can vary enormously from a very sedentary arthritic person compared to a an AFL footballer saying chalk and cheese how much carbs you would need to give the AFL footballer compared to the arthritic quite immobile person.
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So generally proteins for muscle.
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Yep.
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Carbohydrates for energy.
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Yep.
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And fats, I understand, are for hormones and brain development and other aspects.
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That's right.
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And of course, we, we get careful with fats because of heart disease risk.
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So we look at the types of fats.
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Um, so we try and encourage the Mediterranean diet type fats, you know, the healthy poly and mono and saturated fats, which are not dangerous for our heart and are very good sources of essential fatty acids.
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So.
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That's why the Mediterranean diet is very popular and for good reasons.
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It's got some very good aspects.
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So while we're on the macronutrient sort of pathway, if we look at the proteins, we've mentioned obviously a standard diet with meat is the best way of producing or allowing income of protein.
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If someone was vegan, and you mentioned various vegetable products, and I presume nuts as well, how to maintain the amino acids, what in general, I know everyone's requirements vary and you need a specialist dietician advice for personal situations.
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But in general, someone who is vegan and is avoiding milk product as well as fish and meat, how would they make up the amino acids that you would like as a general generalisation for the average person?
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They'll have to pretty much eat every single vegetable source of protein to cover their bases.
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They'll need their legumes and lentils.
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They'll need their tofu and their TPP and those types of proteins.
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They'll need their nuts and their seeds, and they'll have to cover every, every sort of vegetable source of, or non meat source of protein we can get.
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We, we make sure that, uh, It's a big part of their diet and they're getting all of those essential proteins.
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So unlike, you know, I'm not vegan, so if I just one day eat a steak and the next day eat a piece of fish, well, they contain all the essential amino acids, so I don't need to worry so much about whether I've eaten nuts and whether I've eaten seeds and whether I've had tofu and things.
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It's just more difficult, but plenty of vegans out there that are very healthy.
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Excellent.
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So if we look at the.
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Scenarios where you, we took it nuts, obviously every nut varies.
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You get the almonds, which are nice and enjoyable, but then you get cashews who somehow you seem to want to eat them not until the cows come home.
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Is that because they contain a different levels of fat that actually make you enjoy them more or they're all, each nuts exactly the same?
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Well, they're not exactly the same, but they're very similar.
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I mean, you're splitting hairs if you're worrying too much about.
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One nut versus another nut.
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You know, they contain slightly different mixes of the poly versus the monounsaturated fats.
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Slightly different nutrition profiles, but you know, at the end of the day, all nuts are pretty healthy, let's face it.
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It's just, you know, I think the ones that people like the most are the cashews and the almonds and the pistachios, probably are the ones that people enjoy the most.
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Right, so it's not because it contains more fat in it that actually is more unhealthy for you, they're basically all healthy.
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There's little, there's subtle differences, but not enough to get too concerned about.
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If we look at the carbohydrates then, with the exception of actually needing a fuel source to maintain daily life, what are the other positives of having carbohydrates, or I know that your program talks about trying to reduce carbohydrate levels to help reduce fat and obesity and the complications that go with that.
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Is there any other negatives or positives of carbohydrates that you need them for?
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Generally, you could survive with a protein and fat diet and just eat carbohydrates to the minimal amount.
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Well,
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the only thing that they, other than fuel, that they, that they do or give you, of course, is glucose for your brain to function.
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So, your brain's not very good at converting other fuel sources into glucose, so it has to run on either glucose or ketones.
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So, Keto diet, the brain will function on ketones.
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Your other organs don't have a problem.
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They'll convert other nutrients into glucose, but for the brain to work, and a lot of people who try keto diets do notice that their They're not as sharp and they get, they describe it as brain fog and things like that, um, purely and simply because that is what carbs will give you.
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They will give a fuel source to the brain and a fuel source to your body to go and do your Pilates class or your run or whatever you're doing.
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Yeah, I've looked at the intermittent fasting sort of diets, the way of maintaining health, but was always concerned about the risk of the fact that if I was intermittent fasting while I'm doing an operating list, it wasn't such a good idea.
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Yeah, I know myself.
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Where when I've haven't eaten a great breakfast, sometimes when I've been assisting when I was a medical student, I'd feel a bit more faint.
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And so I've actually been reluctant to go down that path, particularly when I'm doing operating lifts on a regular basis.
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Would you
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agree with that?
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100%.
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Um, I'm not a fan of keto diets because I just think they're too restrictive, they're too low.
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You know, they're 20 grams of carbs or less.
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You know, that's a piece of bread, right?
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That's it for the day.
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Then everything else you eat has to contain no carb.
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So I think most people, let's face it, need more carbohydrate than that just to have basic energy levels and, and brain functions.
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So I wouldn't want the operating on me.
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If you are on a keto diet and uh, and you know, your judgment might be a bit clouded.
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So I'm not a big fan of them.
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I know a lot of people try them and a lot of people get good success with weight loss with them because you're not producing much insulin, but I think for general health and having to go to work and do your job and be a normal person, I'm not sure they're sustainable.
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They're very difficult to sustain for long periods of time.
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Right.
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If we go on to the micronutrients, let's talk about the importance of that in maintaining a healthy lifestyle.
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Obviously, I'm aware of the importance of folic acid required for a pregnant lady who's developing a fetus inside them and needs that for the development of brain function.
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What other importance are there of the micronutrients?
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Well, this is a difficult question because they just about do everything.
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Huge implications in wound healing.
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So our zinc and our vitamin C as antioxidants and selenium as antioxidants.
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These are extremely important functions in the body to keep us healthy.
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We have our vitamin A and retinols that are involved in our vision.
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We have Iron, of course, to carry oxygen around our body, or we're pretty stuffed without, without that.
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Bees, of course, to help glucose metabolism and carbohydrate metabolism, so therefore energy.
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So, and, you know, things like selenium we didn't know much about until, you know, 10, 15 years ago.
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So, if you look at a multivitamin preparation now, there's a lot more in them than they used to be.
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Um, so they pretty much do everything.
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Um, and this is the problem when, when someone's on a very restrictive diet, we've got to look at what that food group they're not eating is going to wipe out of their diet.
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I'm not a fan of some of these very restrictive generic diets that are handed out by various people, you know, with a jar of expensive vitamins to take.
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You sort of think, well Why am I following such a rigid regime if I need to then go and spend a lot of money on vitamins and minerals?
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It sort of doesn't make much sense to me.
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So Nick, um, obviously people's, uh, uh, dietary requirements differ during different age groups.
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I know when you see the young child who can eat as whatever they want and they seem to do really well and maintain a good healthy lifestyle.
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At my age, I've got to be extra careful what I eat, otherwise I'm feeling lousy or putting on weight easily.
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So how does the dietary requirements change between different age groups and what the activity levels as well?
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Look, age, gender and, and activity levels are the big three.
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I mean, um, in theory, Males have a bigger muscle mass than females, and that's, we know muscle mass is metabolically active and fat mass is not.
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So, but that's a generalization.
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You can have very lean, strong women who have equally large muscle masses as men.
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As some of the men, but as a rule, you know, we are built slightly differently.
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So men typically have higher energy requirements and higher protein requirements as a result of that.
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Age is another one where, you know, we can generalize sometimes about age.
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We talk about bone density reducing as we get older and muscle mass deteriorating as we get older and hence, therefore, need less calories and less protein.
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But then, you know, you see some incredibly active.
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Older people who are into their 70s and probably doing more exercise than they've ever done in their life.
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So again, that can be a little bit of a generalization, but exercise is the big one.
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If you've got a strength athlete, or even just someone who goes to the gym, you know, the weekend warrior who goes to the gym five times a week and for an hour and absolutely smashes it at the gym, you know, they need a lot more protein than, uh, than somebody who's more sedentary.
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A typical protein intake is one gram per kilogram of ideal body weight.
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But if you've got someone doing a huge amount of exercise, well, we might go up to 1.
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5 grams per kilogram of protein.
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So it's a significant increase.
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And as I said before, if you've got an endurance athlete, you know, someone who's running, you know, six times a week doing 200 kilometers a week of running, then they're going to need enormous amounts of carbohydrates.
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So you're right, those three factors are key factors, and any dietitian who sees a patient has to take them into account, as well as their medical history, of course, and their social history.
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You know, this is where we, you know, Need to know about things in the family that are influencing food choices.
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So that's another whole, whole, uh, category we could talk about for a long time.
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Excellent.
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When you're talking about increasing protein, I know there's a lot of protein powders out nowadays.
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Is that basically ground up nuts and things like that to produce a protein?
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Depends what they are, um, if they're whey protein, they'll be milk based.
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If they're pea protein, or yes, of course, they're going to be, um, there's plenty of vegan proteins around, there's rice bran protein, there's pea proteins, there's soy proteins, but all of the whey protein and whey protein isolates are milk based, so they're not vegan, but they're very good amino acids because they contain all the essential amino acids.
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What about prior to surgery?
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When I'm seeing a patient prior to surgery, is it Something I should be doing to try and increase their nutrition status prior to going down that path?
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I think this is a key area that there's no doubt in undernourished patients more likely to have post operative wound healing problems and no surgeon wants that, of course.
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But it depends on the surgery, doesn't it?
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Let's face it.
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You know, doing a knee arthroscopy and probably the nutritional status of the person's not as significant given their wound risk is, is less.
00:18:15.460 --> 00:18:34.289
But if you've got someone who's about to have a liver transplant, I used to work in the liver transplant unit at Flinders and every single patient that comes through that clinic sees a dietician because we have to assess their nutrition status and we know that pre operatively, if they're in a poor nutrition condition, we need to do something about it before they have their surgery.
00:18:34.519 --> 00:18:41.065
Um, All their outcomes and their complications post surgery, particularly with wounds, is the biggest issue.
00:18:41.315 --> 00:18:44.484
And is this purely something that can be maintained usually through a diet?
00:18:44.924 --> 00:18:50.625
Or is there anything that's needed intravenously or supplements such as the protein powders or tablets?
00:18:50.723 --> 00:18:51.515
I think it depends.
00:18:51.624 --> 00:18:56.464
For protein and carbs and fats, I think we can pretty much get them in the diet.
00:18:56.464 --> 00:19:02.545
Unless the person has reasons they can't consume those foods, you know, they're entrally fed or something like that, then obviously.
00:19:03.134 --> 00:19:05.125
We would give it to them in that format.
00:19:05.345 --> 00:19:14.164
But with vitamin deficiencies, if you had a pre operative patient who was vitamin C deficient, taking oral C might not be good enough.
00:19:14.244 --> 00:19:18.034
We might need to do that intravenously, and this is when we'd do it.
00:19:18.295 --> 00:19:27.295
Get out the intensive care team in because they, they do all of the sort of home TPN type patients and they give these vitamins and minerals, um, IV.
00:19:27.414 --> 00:19:32.054
There are some GP clinics that do that too, but we as dieticians, we can't do that.
00:19:32.055 --> 00:19:36.825
So we would be referring them on to the experts who do that type of thing.
00:19:36.835 --> 00:19:46.984
But, you know, if someone's iron deficient, let's face it, and their surgery's in a week, Taking oral iron is not going to, you don't have time, you know, you're going to, they're going to need an iron infusion.
00:19:47.125 --> 00:20:06.694
Whereas if someone was a bit low in vitamin D, it might be as simple as to give them the 100, 000 unit syringe that they just take orally and you've given them, given them a nice mega dose, um, I do that a lot in our bariatric clinic where a lot of bariatric patients are vitamin D deficient, um, pre surgery, something like two thirds of them.
00:20:06.775 --> 00:20:15.194
So it's quite a significant, um, problem and our GP will typically just give scripts for the, the oral vitamin D.
00:20:15.315 --> 00:20:18.704
But we would obviously correct that before surgery.
00:20:19.174 --> 00:20:24.105
With those sort of patients, are they having a routine blood test to assess their levels of different vitamins?
00:20:24.105 --> 00:20:26.105
Is there a vitamin screen they would generally tend to use?
00:20:26.115 --> 00:20:30.513
And what are the ones we should be thinking about ordering if we're doing a sort of particularly complex patient?
00:20:31.203 --> 00:20:38.503
So our surgeons, when they do the pre operative endoscopy, so they'll take blood off them at the endoscopy, and we measure just about everything.
00:20:38.505 --> 00:20:48.744
Yes, we measure, you know, the usuals, the LFDs and the blood glucose, and we check thiamine because post operatively thiamine deficiency is a disaster if that happens.
00:20:49.934 --> 00:20:54.585
We check their HbA1c, pick up a lot of diabetics that didn't know they were diabetic.
00:20:54.875 --> 00:20:58.535
We do zinc, we do magnesium, we do selenium.
00:20:58.845 --> 00:21:01.875
So these are not routine blood tests, as you can imagine.
00:21:01.875 --> 00:21:05.513
So, but they're the guidelines for bariatric surgery.
00:21:05.804 --> 00:21:10.163
Now, whether other types of surgeries have similar guidelines, I'm not sure, because it's not my space.
00:21:10.564 --> 00:21:26.005
But you know, you sort of think to If I've got a undernourished person who's about to have a fairly major operation, I think that's something that you should take seriously and run some bloods, and if you're concerned, you should refer them on to a dietician before they have their surgery.
00:21:26.295 --> 00:21:30.684
I know sometimes time doesn't permit because the surgery is urgent, but it's something that should be done.
00:21:31.525 --> 00:21:32.875
What about after the surgery then?
00:21:32.884 --> 00:21:43.015
Say the patient is able to eat okay, they've had surgery that allows an oral intake, what's, what are the important things that I should be considering on my menu when I've had my surgery to help me recover better?
00:21:43.375 --> 00:21:55.934
So typically, you know, again, if someone's sarcopenic or malnourished before surgery, and we might still feed them up before surgery, but they're still obviously in a relatively poor nutritional state.
00:21:55.934 --> 00:21:56.154
Okay.
00:21:57.034 --> 00:22:00.534
We would be certainly giving them oral protein supplements, without doubt.
00:22:00.664 --> 00:22:13.354
There is some evidence with using specific proteins like arginine and that, and there's some, you know, pre prepared drinks that have arginine, which are meant to be extremely good for wound healing, but the problem with them is their expense.
00:22:13.424 --> 00:22:17.244
So, not too many situations can you use those.
00:22:17.263 --> 00:22:27.565
So, just using Cheaper protein supplements is probably as good as you're going to get and multivitamins, you know There's no harm in pumping people full of a good multivitamin.