The lack of fullness may be due to the fact that the individual has a relatively large amount of food and always feels underfed when consuming an insufficient amount of food. There are also wolf swallowing when eating, eating too fast, the brain can not get a timely response to keep in the state of not yet full, resulting in the organism want to keep taking in food. There may also be certain diseases that cause under-eating, when suffering from diabetes there will be symptoms of under-eating, digestion too fast, the typical three more and one less disease. During this period, the person not only does not gain weight, but also loses weight quickly because the sugar is excreted in the urine. This can also happen when there are problems with the gastrointestinal tract. When there is chronic gastritis, the nutrients in the food cannot be fully absorbed, resulting in the organism not being satisfied and will always be in a state of not being able to eat enough.