Starvation Diet

Starvation diets are based on the principle of burning far more calories than you consume. This kind of diet generally aims to cut 1000 to 1500 calories a day from your diet. Although you may achieve weight loss initially with such diets, you generally are always hungry.

When your body senses (or believes) it's getting less food than normal, it's "self-preservation" switch is triggered. Because your body believes it's about to starve, the first thing it does is shut down its fat-burners to preserve fuel (fat). That's why your body burns less and less calories on starvation type diets. If a starvation diet is followed for an extended period of time other bodily processes may shut down. Death is even possible if taken to extremes. Moreover, it is possible that in spite of burning a high number of calories by starving yourself, you may still end up gaining weight.