How much weight will you lose if you eat 1200 calories a day?

The average person needs about 1,500 to 2,000 calories a day. So 1,200 calories is a few hundred under that, but weight isn't really lost until more exercise is added in. To lose one pound of fat you need to burn up 3500 calories. How much fat loss that would be for individuals depends on their unique metabolism, the type of exercise they do (or lack thereof and caloric intake of food (a combination of protein, carbohydrates, and fat - each has a different calorie content). Some athletes need to consume thousands of calories just to maintain their required energy demands.