Eating grapes in moderation at night is generally not fattening, but if you often eat too many grapes at night, there is also a risk of fattening. There is less movement at night, the metabolism slows down, and the fructose content and water content in grapes are relatively high. Eating too much before bedtime will easily cause the body to consume energy incompletely thus leading to fat accumulation, or get up several times to go to the toilet, which may make you fat and affect your sleep. You should try to avoid eating grapes before bedtime to avoid tooth decay and gaining weight. Grapes contain glucose, reducing sugar, protein, cysteine, tartaric acid, citric acid, as well as many vitamins and minerals. Eating grapes in moderation at night can replenish water, strengthen the spleen and appetite, promote blood circulation, enhance physical fitness, antioxidant, and moisturize the skin. When eating grapes, you need to clean the grapes to avoid pesticide residues that can cause gastrointestinal discomfort. You can cut off the tips of the grapes near the flesh and soak them in water with flour for 5-10 minutes, the flour will absorb the dust and impurities on the grape skin, and then rinse the grapes with water.