How do most people make their diet decisions? Individual choices are often based on former habits, cost and convenience, beliefs about health and nutrition, and ideas about physical beauty. Some people learn to like certain foods in childhood, and they don’t change later in life. Many people have busy lives, so they buy or prepare food and eat it as quickly as possible. Some meal-planners think only fresh and “natural” food is nutritious, so they buy vegetables, fruits, and foods without additives and prepare it in health ways. People with health problems---like high-blood pressure or diabetes--- may be on special non –salt or non-sugar diet. The nutritional requirements of very young or very old people may be different from the needs of others. Some cultures prefer a slim body to a well-rounded one, so people are always trying to lose weight. They may follow popular diets, such as a low-carb diet---an eating system high in protein but low in refined carbohydrates.