Sudden increase in meal size may be due to high consumption, diabetes, hyperthyroidism and so on. 1. Consumption: may be due to the usual amount of labor is more, resulting in physical energy consumption, the body needs a large amount of energy supply, so there will be an increase in the amount of meals is a normal phenomenon. 2. Diabetes: due to patients with elevated blood sugar, a large number of urine sugar loss, the body lacks energy needs to be supplemented, which leads to hyperphagia, increased meal size. 3. Hyperthyroidism: patients with excessive secretion of thyroid hormones, leading to hypermetabolism, energy consumption will be more, resulting in an increase in meal size. In addition to the above reasons, there are other factors that can cause a sudden increase in the amount of food, with or without other abnormal symptoms, it is recommended to consult a doctor in a timely manner to identify the causes, and then cooperate with the doctor to take treatment, so as to avoid delays in the condition.