The time for digestion after eating is around 4 hours and varies according to the type of food and individual differences in the population. Depending on the type of food eaten, the digestion time varies. Vegetables and fruits, rice porridge fluid food is generally the fastest to digest, ranging from half an hour to two hours, grains are slower, generally about three hours, protein and fat food digestion is the slowest, about four hours. In addition, the elderly, children gastrointestinal power is weak, gastrointestinal diseases will also affect the digestion and absorption of food, prolong the digestion time. Therefore, the daily diet needs to be balanced with the consumption of too much meat and fatty foods may aggravate the burden of digestion, if you only eat vegetables and fruits digestion time is fast, not only unbalanced intake of nutrients, but also poor sense of satiety, and soon hungry. The elderly, children and the weak gastrointestinal function of the crowd suitable for the choice of light and easy to digest food. After eating a meal completely digested time is about 4 hours or so, if there is a loss of appetite, bloating and other discomfort, it is recommended to consult a doctor in a timely manner to clarify the cause.