Reducing the amount of food is easily full may be caused by physiological factors or functional indigestion, chronic gastritis, hypothyroidism and other conditions. 1. Physiological factors: if the recent past consumption is reduced, or long-term sedentary, lack of exercise will lead to metabolic slowdown, gastrointestinal peristalsis slowdown, and so on, and then appeared to reduce the amount of food is easy to satiate the situation. 2. Functional dyspepsia: mainly due to the abnormal gastrointestinal flora, digestive enzymes and other factors can cause gastrointestinal function to reduce, and then appear epigastric discomfort, early satiety, postprandial fullness and other symptoms, so such patients may appear to reduce the amount of food is also easy to satiate the symptoms. 3. Chronic gastritis: Chronic gastritis is characterized by chronic inflammation of the gastric mucosa, which can cause abnormalities in gastric motility, leading to symptoms such as abdominal distension, early satiety, loss of appetite and abdominal pain. 4. Hypothyroidism: due to the body’s thyroid hormone level decline can cause the body to appear low metabolic state, at this time the patient will appear constipation, abdominal bloating, reduced meal size and other gastrointestinal symptoms. Reduced food intake is easily satiated may also be caused by digestive tract tumors and other factors, to rule out physiological factors, it is recommended to go to the hospital for medical treatment.