While high protein diets have been shown to improve satiety and lean body mass, researchers from the UCLA Center for Human Nutrition studied the effects of a protein-enriched meal replacement on weight loss compared to a standard protein meal replacement.
For 12 weeks, 100 obese men and women, split into two groups, consumed meal replacements twice daily (one meal, one snack), containing either a supplementary protein powder or a carbohydrate powder, both equal in calories. One additional meal was included in the meal plan designed to achieve protein intakes of either 2.2g of protein per kilogram of bodyweight per day or 1.1g of protein per kilogram of bodyweight per day.
Although weight loss was similar, the group consuming the protein-enriched meal replacement lost twice as much fat. They also experienced a significant decrease in cholesterol and LDL “bad” cholesterol, which was not seen in the standard protein meal replacement group.