Sugar is an essential nutrient for the human body, excessive abstinence from sugar will lead to insufficient sugar in the body to meet the body’s need for energy, which can lead to lack of energy, generalized fatigue, limb weakness, neurological manifestations, and may also lead to hypoglycemia. However, excessive intake of sugar other than staple foods will have an impact on the body, so you should abstain from unnecessary sugar intake. 1. Insufficient energy supply: sugar is the body’s main daily source of energy, abstaining from sugar can lead to insufficient energy, generalized weakness, limb weakness and other symptoms. 2. Neurological manifestations: sugar is the main energy-supplying substance for brain cells and tissues, and brain cells are particularly sensitive to the demand for sugar. Insufficient sugar can lead to insufficient energy and blood supply to the brain, resulting in dizziness, weakness of the limbs, and even impaired consciousness. 3. Hypoglycemia: Insufficient sugar intake may have hypoglycemic manifestations, such as panic, sweating, hunger, tremor and other manifestations, and in severe cases, coma. Excessive abstinence from sugar is all unreasonable, but one should abstain from unnecessary sugar intake, such as sweet drinks and cakes.