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Researchers had a group of young, regularly active overweight men restrict their food intake by 40% for a period of 4 weeks.
One group consumed 116 grams of protein per day (1.2 grams per kilogram body weight), a level about 1.5 times the recommended dietary allowance (RDA). Another group consumed about twice that amount (245 grams/day), or 2.4 grams per kilogram body weight. The higher protein intake was achieved by providing participants with whey protein drinks. Both groups performed high-intensity training 6 days per week for 4 weeks.
As expected, both groups lost significant weight, however, the composition of weight loss was different. The moderate protein group saw virtually no change in lean body mass (0.2 pounds), whereas the high-protein group showed an increase of 2.6 pounds. Fat loss was also greater in the high-protein group (-10.6 vs -7.7 pounds).
Thus, higher protein intake—representing three times the RDA—was able to promote gains in muscle mass in response to a short-term but marked energy deficit combined with intense training.
Athletes, who need to cut weight over a period of several weeks, should consume more protein, especially from whey protein shakes, and eat a calorie-restricted diet. This higher protein, lower calorie diet is likely to result in better preservation of muscle mass and might even promote gains in muscle mass.
Dr. Jeff Volek is a registered dietitian and Full Professor in the Department of Human Sciences at The Ohio State University. He has published 270 articles examining health and performance effects of low-carbohydrate diets and other dietary supplements including seminal work on creatine, carnitine and whey protein.
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