Because: there is nothing wrong with insisting on exercise, but controlling diet is not to eat less or only coarse grains such as millet porridge, which may lead to malnutrition. The really correct way to lose weight is scientific exercise, and then control the calorie intake of each meal, because the biggest part of people's daily consumption is basal metabolism (a person will consume about1500-2,500 calories according to parameters such as height and weight, which is basal metabolism), and the calories consumed by one hour of exercise are only 200-600 calories. However, once people are hungry (for example, three to two meals will inevitably make them feel hungry), for self-protection, people will instinctively and automatically reduce their basal metabolism to protect themselves, and the wrong method of hunger and weight loss will one day be unbearable and eat a lot, and the basal metabolism will not recover soon. Therefore, controlling diet is definitely not starvation, but controlling the total calorie intake per meal. You can eat more crude fiber food during fat reduction, and at the same time ensure the nutrients needed by the human body. Because crude fiber food is easy to feel full, it will also help to lose weight.