" Basal metabolic rate for a lightly active average male is roughly 2500 calories per day. Walking at a moderate pace (2 miles per hour) for forty-five minutes every day, would burn roughly 104 calories. In other words, that will not even consume 5 per cent of the total energy expenditure. The vast majority (95 per cent) of calories are used for basal metabolism. "

― Jason Fung , The Obesity Code: Unlocking the Secrets of Weight Loss