There are many different causes of obesity, but three main causes of obesity are eating too many high-fat or refined sugary foods, reduced energy expenditure and the genes one is born with. People who tend to eat foods that are high in fat or contain a lot of calories in just a small portion are more likely to gain weight than people who fill their plates with large amount but low-calorie foods such as bread, potatoes and vegetables. People who eat more calories need to burn more calories, otherwise their calorie surplus is stored as fat. …