A caloric deficit is any shortage in the amount of calories consumed relative to the amount of calories required for maintenance of current body weight. A deficit can be created by reducing input/calories consumed. A deficit can also be created by increasing output without a corresponding increase in input.
The easiest way to ensure you eat fewer calories than you burn is, of course, to eat very little. If you have an apple for breakfast, a small salad for lunch, a piece of toast for dinner and nothing else, you can be pretty sure you're maintaining a calorie deficit. But you'll also be miserable with hunger and a lack of energy.
The optimal calorie deficit is large enough to stimulate steady fat loss, but not so large that you're always hungry and lethargic. Avoiding a calorie deficit that is too large is even more important for athletes, who need to keep their muscles well-fueled for training. The calorie deficit "sweet spot" for athletes is 300 to 500 calories per day.
MyFitnessPal is a smartphone app and website that tracks diet and exercise to determine optimal caloric intake and nutrients for the users' goals and uses gamification elements to motivate users.
How does a client connect MyFitnessPal to the Physique Society App?
Follw this link for info https://bit.ly/2pMGgEJ
