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In our studies, those people on a higher-protein diet lost the same amount of weight as those on a higher-carbohydrate diet. This is because the two diets offered an equal amount of fat. However, body composition (that is, the ratio of fat to muscle) observed greater improvement among those people on the higher-protein diet. When the participants in other studies were allowed to eat until they were no longer hungry, those on the higher-protein diet lost more weight than those on the higher carbohydrate diet, even after more than a year. The reduction in hunger and the beneficial effect on muscle provided by the higher-protein diet is mostly related to its protein content, while the enhanced fat-loss seems to be related to its lower amounts of carbohydrate. The diet is healthy because its protein comes from lean red meat fish, chicken and low-fat dairy products, all of which provide good nutrition. A high-protein diet in which the protein comes from protein powders and supplements .