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Overfeeding 40% more calories with 25% protein diet caused weight gain of 13.5 lbs
Monday, November 22, 2010 11:29 am Email this article
When people were overfed 40% more calories than necessary with a high-protein diet containing 25% protein, they gained an average of 13.5 pounds after two months according to a new study from researchers at the Pennington Biomedical Research Center at Louisiana State University in Baton Rouge, Louisiana USA.
This compares to a weight gain of 7.1 lbs on a 5% low-protein diet, and a weight gain of 13.3 lbs on a 15% medium-protein diet. Body Fat
Body Fat: +7.9 lbs
Body fat increased by an average of 7.9 lbs on the 25% high-protein diet compared to a 8.2 lbs for those fed a 5% low-protein diet, and 7.6 lbs for those fed a 15% normal-protein diet.
Notice Gain in Body Fat the Same
Notice that the gain in body fat was the same regardless of the protein content
Notice that people gained the same amount of body fat regardless of the protein content of the diet.
Muscle: +5.9 lbs
Lean body mass (muscle) increased by 5.9 lbs for those fed a 25% medium-protein diet compared to an decrease of 0.7 lbs of lean body mass (muscle) in those fed a 5% low-protein diet, and an increase of 6.3 lbs of lean body mass (muscle) for those fed a 15% medium-protein diet.
Total Energy Expenditure
Total Energy Expenditure: +422 calories
Total Energy Expenditure increased by 422 calories per day in those fed a 25% high-protein diet versus an increase of 66 calories per day in those fed a 5% low-protein diet, and an increase of 533 calories per day for those fed a 25% high-protein diet.
Subjects: 16 men and 10 women living in an inpatient ward for 2 months
The study involved “16 men and 10 women who lived on an inpatient ward for 8 weeks and received meals containing 40% more calories than estimated from a composite of 24-h energy expenditure and weight stabilization prior to overfeeding.”
Conclusion: The protein content of the diet affects weight gain and changes in lean body mass
“The protein content of the diet influences the change in body weight and changes in lean body mass and total and sleeping energy expenditure, but not the total fat storage,” the authors of the study concluded.
The study was funded by the US Department of Agriculture.
Smith S, De Jonge L, Xie H, Rood J, Brock C, Bray G. Effect on body fat of eight weeks of overfeeding with three different protein diets. Obesity Reviews. 2010 July, 11(Suppl S1):Poster T2:PO.16 (page 180).
AUTHOR’S CONTACT INFORMATION
Steve R. Smith, MD
Pennington Biomedical Research Center
Louisiana State University
Baton Rouge, Louisiana USA
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