If you lose 300 calories on a treadmill don't you just gain it back when you eat that same day if your body needs 1500 to 2000 calories a day?

Answer 1

The idea is to burn more calories than you consume. So by burning 300 calories you could technically eat an extra 300 calories and remain at the same weight because you body would on average use 1500-2000 calories to stay alive and to conduct daily functions whether you exercise or not. Do not stick to firmly to 1500 - 2000 calories as the range can vary, those with desk jobs would use 1500 while those with high labour jobs such as builders would need more. I hear the best way to fight the weight is the good old regular exercise. I recall hearing that your body continues working at a higher metobolic rate for upto 24 hours after the exercise, so regular exercise would mean your body is burning more fat than it normally would. Eat healthy + exercise often :D