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Low protein diets can lead to weight gain: new studyPM - Low protein diets can lead to weight gain: new study 17/10/2011
MARK COLVIN: New research shows that low protein diets lead to overeating.
Australian researchers say they've found the first scientifically supported evidence that protein in the diet plays an important role in appetite and total food consumption.
Test subjects on a 10 per cent protein diet ate more snacks between meals and consumed significantly more calories in total than people on a 15 per cent protein diet.
The research has implications for continuing campaigns to reduce obesity in the population.
Brendan Trembath prepared this report.
BRENDAN TREMBATH: It's well known that obesity can be prevented through exercise.
(Sound of ball being hit)
Andrew Daniels and Ryo Taniguchi play a friendly game of tennis on a court at Sydney University.
And we know obesity can also be prevented by cutting calories - well not necessarily.
Dr Alison Gosby from the University of Sydney's School of Biological Sciences.
ALISON GOSBY: You can't just count the amount of calories that you're eating in a day. What you need to do is you need to actually maintain your protein intake as you would have and drop the rest of the energy intake by dropping the amount of fat and maybe simple sugars that you're eating.
BRENDAN TREMBATH: Dr Gosby and Professor Steve Simpson have published their protein research in the online journal PLoS ONE.
They began by recruiting 22 lean people.
ALISON GOSBY: We pretty much put an ad out for lean, healthy subjects. We had up to a 50-year-old but the age range was mainly from 21 through to 50, all healthy people.
BRENDAN TREMBATH: They were housed in apartments on campus.
ALISON GOSBY: So we put them in a facility that's made for doing studies such as these where they could basically go about their own thing during the day but they didn't have access to any outside food.
BRENDAN TREMBATH: The captive subjects were served three meals a day and snacks.
ALISON GOSBY: They'd have muesli and yoghurt for breakfast, a choice of muffins and often a different kind of banana bread or some kind of cake.
They'd then have a wrap for lunch with some salad and then main meals would be fairly similar - a pasta or a curry or something like that for dinner.
Then they'd also have some cakes or savoury scones or something like that, that would be available to them all day, that they could snack at if they were feeling hungry.
BRENDAN TREMBATH: Over time there were slight differences in the menus. The protein varied.
The researchers say they found the people on a 10 per cent protein diet ate more snacks between meals and consumed significantly more calories in total than the people on a 15 per cent protein diet.
ALISON GOSBY: Well they were allowed to eat as much as they want. They had so much food available to them, but they definitely ate more on the 10 per cent protein week.
BRENDAN TREMBATH: Dr Gosby says they'll do more research on protein and examine why some people don't get enough of it.
ALISON GOSBY: We're kind of being pushed to eating higher fat and carbohydrate foods rather than the protein foods.
BRENDAN TREMBATH: So do you mean for example if you look at a fast food menu the French fries might be a bit cheaper than the hamburger?
ALISON GOSBY: Yeah that's right and basically fast food is cheaper than going to make a healthy meal sometime. We're being forced to dilute the protein in our diet.
MARK COLVIN: Dr Alison Gosby from the University of Sydney with Brendan Trembath.
Low protein diets can lead to weight gain: new studyPM - Low protein diets can lead to weight gain: new study 17/10/2011
MARK COLVIN: New research shows that low protein diets lead to overeating.
Australian researchers say they've found the first scientifically supported evidence that protein in the diet plays an important role in appetite and total food consumption.
Test subjects on a 10 per cent protein diet ate more snacks between meals and consumed significantly more calories in total than people on a 15 per cent protein diet.
The research has implications for continuing campaigns to reduce obesity in the population.
Brendan Trembath prepared this report.
BRENDAN TREMBATH: It's well known that obesity can be prevented through exercise.
(Sound of ball being hit)
Andrew Daniels and Ryo Taniguchi play a friendly game of tennis on a court at Sydney University.
And we know obesity can also be prevented by cutting calories - well not necessarily.
Dr Alison Gosby from the University of Sydney's School of Biological Sciences.
ALISON GOSBY: You can't just count the amount of calories that you're eating in a day. What you need to do is you need to actually maintain your protein intake as you would have and drop the rest of the energy intake by dropping the amount of fat and maybe simple sugars that you're eating.
BRENDAN TREMBATH: Dr Gosby and Professor Steve Simpson have published their protein research in the online journal PLoS ONE.
They began by recruiting 22 lean people.
ALISON GOSBY: We pretty much put an ad out for lean, healthy subjects. We had up to a 50-year-old but the age range was mainly from 21 through to 50, all healthy people.
BRENDAN TREMBATH: They were housed in apartments on campus.
ALISON GOSBY: So we put them in a facility that's made for doing studies such as these where they could basically go about their own thing during the day but they didn't have access to any outside food.
BRENDAN TREMBATH: The captive subjects were served three meals a day and snacks.
ALISON GOSBY: They'd have muesli and yoghurt for breakfast, a choice of muffins and often a different kind of banana bread or some kind of cake.
They'd then have a wrap for lunch with some salad and then main meals would be fairly similar - a pasta or a curry or something like that for dinner.
Then they'd also have some cakes or savoury scones or something like that, that would be available to them all day, that they could snack at if they were feeling hungry.
BRENDAN TREMBATH: Over time there were slight differences in the menus. The protein varied.
The researchers say they found the people on a 10 per cent protein diet ate more snacks between meals and consumed significantly more calories in total than the people on a 15 per cent protein diet.
ALISON GOSBY: Well they were allowed to eat as much as they want. They had so much food available to them, but they definitely ate more on the 10 per cent protein week.
BRENDAN TREMBATH: Dr Gosby says they'll do more research on protein and examine why some people don't get enough of it.
ALISON GOSBY: We're kind of being pushed to eating higher fat and carbohydrate foods rather than the protein foods.
BRENDAN TREMBATH: So do you mean for example if you look at a fast food menu the French fries might be a bit cheaper than the hamburger?
ALISON GOSBY: Yeah that's right and basically fast food is cheaper than going to make a healthy meal sometime. We're being forced to dilute the protein in our diet.
MARK COLVIN: Dr Alison Gosby from the University of Sydney with Brendan Trembath.
