Leptin is a protein produced in fat cells by the gene ob (which means obesity) and is somehow responsible for transmitting to the brain centers, the signal that reduces appetite and increases metabolism and physical activity. When we observe increased weight, we are dealing with the phenomenon of resistance to leptin, meaning the abnormal reaction of the brain to the stimulus that this particular hormone causes when comes in contact with their respective receptors. Therefore in our brain does not reach the correct signal to regulate the appetite, but completely the opposite one. To get an...