Sunday, November 22, 2009

First Study to Support 1 gram of protein per pound of bodyweight when dieting?

Here's a study I came across today...looks like it might be the first study I've ever seen to support 1 gram of protein per pound of bodyweight when dieting...very interesting...I'll need to buy this one and review it...

One thing to note, they cut calories big-time, by 40%. So that would be taking a guy on 2000 calories all the way down to 1200 calories. That's a big drop.

Anyways, here's the abstract...

Med Sci Sports Exerc. 2009 Nov 13. [Epub ahead of print]

Increased Protein Intake Reduces Lean Body Mass Loss during Weight Loss in Athletes.

Mettler S, Mitchell N, Tipton KD.

1School of Sport and Exercise Sciences, University of Birmingham, Birmingham, United Kingdom 2Department of Agricultural and Food Sciences, ETH Zurich, Zurich, Switzerland 3English Institute of Sport, Sheffield, United Kingdom.

PURPOSE:: To examine the influence of dietary protein on lean body mass loss and performance during short-term hypoenergetic weight loss in athletes. METHODS:: In a parallel design, 20 healthy, young resistance trained athletes were examined for energy expenditure for one week and fed a mixed diet (15% protein, 100% energy) in the second week, followed by a hypoenergetic diet (60% of the habitual energy intake), containing either 15% ( protein (control group, n=10; CP) or 35% (~2.3 protein (high protein group, n=10; HP) for two weeks. Subjects continued their habitual training throughout the study. Total, lean body and fat mass, performance (squat jump, maximal isometric leg extension, one repetition maximum bench press, muscle endurance bench press and 30 sec wingate test) and fasting blood samples (glucose, non esterified fatty acids (NEFA), glycerol, urea, cortisol, free testosterone, free IGF-1 and growth hormone) and psychological measures were examined at the end of each of the four weeks. RESULTS:: Total (-3.0 +/- 0.4 kg and -1.5 +/- 0.3 kg for the CP and HP, respectively, p=0.036) and lean body mass loss (-1.6 +/- 0.3 kg and -0.3 +/- 0.3 kg, p=0.006) were significantly larger in the CP compared to the HP. Fat loss, performance and most blood parameters were not influenced by the diet. Urea was higher in HP and NEFA and urea showed a group*time interaction. Fatigue ratings and 'worse than normal' scores on the DALDA were higher in HP. CONCLUSION:: These results indicate that ~2.3 or ~35% protein was significantly superior to ~1.0 or ~15% energy protein for maintenance of lean body mass in healthy young athletes during short-term, hypoenergetic weight loss.

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