The 1000 Calorie Challenge diet is a program that combines intensive workouts and
a unique eating routine to produce a very fast and substantial fat loss. At least, that's how it's supposed to work. The question is whether it's really effective or not.
The program is based on two principles, each of them revolving around the 1000 Calories figure:
1. The program teaches you how to do short but highly intensive workouts that can help you burn 1000 calories. In addition, the workouts are designed to produce a metabolic spike that can last for hours after you finish working out burning more calories and shedding more fat afterwards.
These workouts are hard but the program shows how you can improve your fitness levels quickly to be able to perform these kinds of workouts. The fat loss is worth the effort.
2. The program includes an eating plan that advocates some 1000 calorie diet days. These are low calorie days that are used to create a massive calorie deficit and to increase the fat loss rate that you can expect to achieve.
Although these are low calorie days, the program doesn't starve you. There are also days with higher calorie consumption as well as Cheat Days in which you can actually overeat even things that are not ordinarily dietary: cookies, cakes, ice-cream, and so on.
This combination of intensive workouts and a calorie deficit creating eating routine is what makes the 1000 Calorie Challenge so effective. It simply allows you, if you're determined and motivated, to burn a lot of fat and calories off your body and to lose weight quickly.