Their researchers, reported in JCI, discovered a particular form of a gene, previously linked to obesity, known as FTO. FTO is a gene that increases the craving for high-fat foods. In addition to studies related to obesity and different tests, scientists have also discovered recent genes linked to obesity. The first gene linked to obesity is leptin. Leptin is considered the “obesity hormone”, leptin is produced by fat cells and is the thermostat of the body's energy needs. In each individual its own input of leptin, if for some reason leptin levels fall below the correct amount, the brain understands that the body is starving and needs more calories, if it is maintained or exceeds the correct amount, the brain knows it is. no more need for food. In obese patients, leptin levels in the blood are higher. However, researchers are convinced that obese people do not receive the signal to stop eating. Another gene is ghrelin. Ghrelin is the gene that is the appetite hormone, which makes food more desirable. Studies have shown that sleep-deprived people have increased ghrelin levels. The final gene putatively linked to obesity is neuropeptide Y. Neuropeptide Y triggers eating by manipulating appetite, leading to mood swings and high stress levels (Health). According to the bariatric surgery source, obesity