sentences:  According to the 2010 Dietary Guidelines for Americans, healthful diets contain the amounts of essential nutrients and energy needed to prevent nutritional deficiencies and excesses.Healthful diets also provide the right balance of carbohydrates, fat, and protein to reduce risks for chronic diseases, and they are obtained from a variety of foods that are available, affordable, and enjoyable.Meat contains complete proteins, but vegetarian protein sources are incomplete proteins and therefore a variety of protein rich foods must be consumed to create a complete protein profile.