Diets with higher percentage of proteins than normal, recommended by bodybuilders and fitness enthusiasts to build muscle and lose fat at the same time. These diets are usually low in fat, so the body uses Protein for 30%, Carbohydrates for 50% and fats for 20% of its calorific needs. Normally the body uses only 15% of proteins for calories. Brown rice and chicken is one of classic example of such diets which are high in carbohydrates and proteins. To be noted that very high protein intake without carbohydrates or fats can lead to fatal metabolic condition known as Rabbit Starvation.