Hi doctors, can you tell me what is high fructose corn syrup and leptin?

See below: Leptin is a hormone made by fat cells. It regulates stored body fat. When body fat reaches a certain level, leptin acts on the brain's arcuate nucleus to increase energy expenditure and limit additional fat storage. High fructose corn syrup is a compound of corn sugars altered to increase fructose content and sweetness. It is cheaper than cane sugar and is the major sweetener in processed foods.