Diabetic patients with large meals can not control obesity, may lead to elevated blood glucose, exacerbating the condition; may also cause complications and other systemic diseases, it is recommended to comply with the doctor’s instructions for treatment. 1. Elevated blood sugar: controlling diet and weight plays a very important role in controlling diabetes. Failure to control diet and body weight may lead to elevated blood glucose and aggravate symptoms such as excessive drinking, eating and urination. 2. Causing complications: Poor diet and weight control over a long period of time will lead to poor blood glucose control, which in turn will induce other diseases such as diabetic foot, diabetic ophthalmopathy, hyperosmolar hyperglycemic syndrome and so on. 3. Other systemic diseases: long-term poor weight control will also increase the burden on the heart, which may lead to heart disease. And weight gain will also aggravate the burden on the lower limbs, which in turn induces arthritis and other diseases. For patients, it is important to control diet and weight, and standardize treatment under the guidance of a doctor, strict control of blood glucose stabilization.