Lean Beef
Lean beef is a source of leucine, which is one of the eight essential amino acids involved in protein synthesis and an important component of hemoglobin. A study conducted at the University of Illinois found that overweight women who ate between nine to 10 ounces of lean beef daily while maintaining a 1,700 calorie diet lost more weight, more fat and less muscle mass than the control group who consumed the same amount of calories but less protein.
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