Farts are mainly produced when carbohydrates are broken down by intestinal bacteria, producing large amounts of gas. The causes of especially smelly farts are the following: 1. Eating too fast and too quickly when eating, swallowing a lot of air. 2. Eating too much food that causes bloating, such as beans, milk, etc. On top of that, some people may have chronic gastritis, gastric ulcer, duodenal ulcer, colitis and other diseases of the digestive tract, causing food indigestion. 3, some patients constipated, residual food accumulates in the intestine for a long time, bacteria decompose these food residues, producing a lot of gas. It is recommended to eat more fresh vegetables and fruits, eat less and more meals, and try to avoid the intake of foods that produce more gas to keep the intestines open and relieve constipation.