Excessive obesity is harmful to health. Nowadays, people lose weight for many reasons. However, losing weight is not an easy task. It requires a combination of long-term exercise and a balanced diet. But losing weight may put the body at risk of nutritional deficiencies. During weight loss, the food we consume will directly affect our metabolism. Therefore, it is difficult to keep the body in perfect condition if the nutrients are insufficient. This is also the reason why people experience symptoms such as hair loss, fatigue and even constipation during weight loss.