Ghrelin is secreted mainly in the stomach. It stimulates appetite and increases food intake. Leptin is a hormone, synthesized primarily in fat cells, that has been shown to decrease food intake and increase energy expenditure.
Propane gas does not have an effect on breathing by itself, but displaces oxygen from the air making it hard to breathe. If enough oxygen is displaced, a person could asphyxiate. If the exposure to propane gas is minimal, there are little to no symptoms if inhaled. If oxygen is displaced from the air because of high quantities of propane gas, symptoms that are present are rapid heart rate, clumsiness and fatigue. The longer the exposure occurs, the less oxygen will be present, and symptoms such as vomiting, convulsions and even death can occur.
Trapped Gas Symptoms 1  : Common signs of trapped gas are flatulence, belching and abdominal bloating. 2  Belching is quite common after taking meals which indicates stomach is full. 3  Meganblase syndrome is the condition of chronic belching which arises due to the formation of large gas bubble inside the stomach. Gas bloat syndrome is present in individuals who are operated for GERD. Flatulence is the release of gas through the rectum which is also a symptom of trapped gas.