When dieting means losing weight, the intake of various vitamins is also reduced due to the reduction of food eaten, which is easy to cause symptoms of vitamin deficiency and cause weight loss sequelae. But in fact, vitamins themselves have no calories, and some of them can help metabolize calories. For example, B 1, B2, B6 and B 12 in vitamin B group can promote the metabolism of fat, protein and sugar, and have the functions of burning fat and avoiding fat accumulation. The main sources of these vitamins are coarse grains, fruits and vegetables, milk and eggs. Especially coarse grains are low in calories and high in vitamins. People who lose weight often skip meals. In fact, they can use coarse grains instead, which will not only make them feel full, but also help them lose weight. Beer yeast, which is very popular at present, is also a holy product to lose weight because it is rich in vitamin B group. Obesity is a state of metabolic imbalance, and vitamin B is an important nutrient that affects our metabolism. Therefore, insufficient intake of vitamin B group will lead to obesity.