In the “thin” for the beauty of today, weight loss is the theme of the times. Weight loss is inseparable from eating, how to eat, what to eat to help lose weight? This is a lot of people want to understand, but do not understand the problem. Our usual diet, the most inseparable two sources of nutrition, that is, carbohydrates and fat. Some people have to ask, in these two sources of nutrition, which one is more likely to make the body fat? Let’s first understand, what is carbohydrate? What is fat? Carbohydrates are the main components of the structure of living cells and the main energy supply substances, but also has an important role in regulating cellular activities, mainly in the formation of glucose, glycogen and sugar-containing complexes, its main food sources are sugar, cereals (such as rice, wheat, corn, barley, oats, sorghum, etc.), fruits (such as sugar cane, melon, watermelon, bananas, grapes, etc.), dried fruits, dried legumes, root vegetables ( such as carrots, sweet potatoes, etc.). Fats are triacylglycerides composed of glycerol and fatty acids, and fats come directly from the fatty tissue of animals, such as lard. Fats come directly from the oil-bearing parts of plants, such as soybean oil. Let’s compare that 1 gram of carbohydrates of the same mass produces about 4 kcal in the body, while 1 gram of fat produces 9 kcal. That means that the more calories produced nutrients at the same weight, the more likely it is to make people fat. This is a very simple truth. Both carbohydrates and fats, if consumed in excess, will become fat stored in the body. Obesity is caused by excess total energy, so it is important to consider the full range of energy in all foods during the diet. Obesity is not caused by a single factor, weight control must control the intake of total energy in all foods, maintain a balanced dietary structure, and very importantly: move. Weight loss is a systematic work, can’t ignore the role of fat on the body because it is easy to gain weight, if the lack of fat intake for a long time, it is also extremely detrimental to health.