Increasing protein intake and reducing fat intake caused 11 lbs weight loss in 3 months

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Thursday, December 07, 2006 2:35 am Email this article
Increasing protein intake from 15 percent to 30 percent of calories and reduing fat from 35 percent to 20 percent of calories caused normal and overweight people to eat 441 fewer calories per day and lose an average of 10.8 pounds in three months according to a study from the University of Washington in Seattle, Washington, USA. Decreased intake

Calorie intake decreased from 2356 to 1884

Calorie intake decrease by an average 441 calories per day, from an average of 2356 calories to 1884 calories.

 

Weight Loss

Weight loss : 10.8 pounds

Average body weight decreased by 10.8 pounds, from 159 pounds to 148 pounds.

 

Fat Loss

Fat Loss : 8.1 lbs

Three-fourths of the weight loss—8.1 pounds of the 10.8 pounds—was body fat.

 

Metabolism

No difference in resting metabolism

There was no difference in resting metabolism while eating the higher protein diet.

The average resting metabolism while on a normal diet was 1542 calories per day compared to 1560 calories per day while eating 30 percent protein.

 

Hunger and Fullness

Less hunger and greater fullness

Subjects reported less hunger and a greater feeling of fullness. This is typical when protein is increased.

 

Diet

Diet : 30% protein, 20% fat, 50% carbohydrates

The diet consisted of 30 percent protein, 20 percent fat and 50 percent carbohydrates.

 

Subjects

Subjects : 19 people

The study involved 19 people aged 27- to 62-years-old with a body mass index (BMI) of 22 to 30—normal weight to overweight, but no obese people were included.

 

Weight Loss

Weight loss largely due to decreased fat intake, but also higher protein intake

“It is likely that a reduction in dietary fat by 15% of total energy—[decreasing from 35 percent of calorie to 20 percent of calories]—contributed to weight loss in the present study,” the researchers noted.

“However, a larger 20% reduction in dietary fat with no change in the percentages of calories from protein produced less weight loss—[8.1 pounds in our previous study versus 10.8 pounds in this study]—[suggesting] that substituting protein for fat in the diet may lead to greater weight loss than can be obtained by substituting carbohydrate for dietary fat,” the authors concluded.

REFERENCE

Weigle D, Breen P, Matthys CC, Callahan H, Meeuws K, Burden V, Purnell JQ. A high-protein diet induces sustained reductions in appetite, ad libitum caloric intake, and body weight despite compensatory changes in diurnal plasma leptin and ghrelin concentrations. Am J Clin Nutr. 2005 Jul, 82(1):41-48.

AUTHOR’S CONTACT INFORMATION

D. S. Weigle
Endocrinology
Box 359757
Harborview Medical Center
325 Ninth Avenue
Seattle, WA 98104
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Articles on the same subject can be found here:

• Fat Intake (Dietary Fat)

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