Here is a 7-minute video of obesity researcher, George Bray, MD, talking about the results of their new study in which they overfed subjects roughly an extra 1,000 calories per day of either a low-protein diet (5% protein), a normal-protein diet (15% protein), or a high-protein diet (25% protein), and the effect that this had on body weight and body fat.

All groups gained weight. The normal- and high-protein groups gained the most weight (13-14 lbs vs 7 lbs for the low-protein group), and all groups gained roughly the same amount of body fat.

In other words, overeating caused weight gain regardless of weather they were overeating a high-protein diet or a low-protein diet.

Even though the low-protein group gained weight, they lost a small amount of lean body mass (muscle).

Dr. Bray notes that this shows that not eating enough protein—a diet containing only 5% protein—will not prevent loss of lean body mass. He notes that this finding was unexpected.

Patients eating a low-carbohydrate group lost nearly twice as much weight as those in the low-fat group. Those in the low-carb group lost an average of 26.4 pounds versus 14.3 pounds for those in the low-fat group.

After losing an average of 13.8 pounds in a month on a very low calorie diet, people given an extra 30 grams of protein per day only regained 1.8 poundsover the next six months —all of which was muscle—compared to an weight gain of 6.6 pounds in people not given the extra protein according to a study from The Netherlands.

Increasing protein intake from 12 percent to 25 percent increased weight loss by an average of 8.4 pounds in six months according to a recent study.

Women with type 2 diabetes eating a high-protein diet lost nearly twice as much body fat—11.7 pounds versus 6.2 pounds—as those eating a low-protein diet according to a recent study.

After losing 15 pounds in one month on a very-low-calorie diet, people were able to maintain this weight loss either by taking 90 mg of EGCG plus 50 mg of caffeine after each meal, or by eating a high-protein diet containing 100 grams of protein per day, which included 50 grams of a simple protein powder called calcium caseinate according to a study from Maastricht University in Maastricht, Netherlands.

People eating a diet containing adequate protein of only 50-60 grams of protein per day regained 6 pounds during the three months of intended weight maintenance.

A high-protein, low-fat, low-glycemic index diet reduces calorie intake by 25 percent compared to a high-carbohydrate, low-fat diet and reduced triglycerides by 35% according to a recent study.

Increasing protein intake from 15 percent to 30 percent caused patients to lose an average of 10.8 pounds in three months, including a loss of 8.1 pounds of body fat according to a recent study.

Increasing protein intake from 15 percent to 30 percent reduces calorie intake by an average of 441 calories per day according to a three month study.

A high protein, reduced fat diet causes 7.7 pounds more weight loss than a medium protein, reduced fat diet according to study from obesity researcher Arnie Astrup and others in Denmark.

A high protein diet does not adversely affect calcium levels, kidney function or cardiovascular risk factors according to obesity researcher Arnie Astrup.

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.

Increasing protein intake from the current 15-18 percent to 20-35 percent causes people to spontaneously eat less and lose weight according to obesity researcher Arnie Astrup.

A high-protein diet attenuates the decrease in metabolism seen following weight loss according to one study.

A high protein diet increases weight loss and reduces bone loss compared to a low protein diet with the same amount of fat according to a study from Denmark.