What are the simple ways to reduce belly fat?

Big belly, fat, usually due to unhealthy diet, often eat high fat, high calories, high sugar food, resulting in excess nutrition in the body, a large number of accumulation in the abdomen. Recently began to pay attention to improve diet, reduce fat, calories and other substance intake, more abdominal exercise, such as sit-ups, yoga, etc., and often run aerobic exercise, adhere to a month or so can gradually improve.