1000 calorie diets are recommended for those who want to lose weight.  This diet drastically reduces the calorie intake, but does not insist on any additional exercise or physical activity.  The logic is that a person who wants to reduce weight can continue doing the same level of activity with lower levels of calorie intake and the normal calorie burn up would take care of the excess weight over a period of time. 1000 calorie diets are short term diets that are to be undertaken for a period of ten days at a time under medical supervision. .

1000 calorie diets do not take into account the body weight, or calorie requirements of the individual.  A person who requires 1200 calories and a person who requires 2200 calories for his daily activity are treated on par. Both individuals are to consume only 1000 calories per day for the duration of the diet.

An average person loses around one pound for every three thousand five hundred calories cut down.  If you are cutting down the calories at the rate of 1200 calories a day, you will lose one pound in three days.

This diet also implies that you need to drastically change your eating habits for the duration of the diet. The diet recommends smaller meals that are eaten more frequently.  It cuts down on fats, sugar and lowers the consumption of carbohydrates.  Alcohol is to be avoided and diet soda and black coffee can be taken with limitations.

The calorie focus can rob the diet of interest.  If you are foodie, it is very easy to give up counting calories and abandoning the diet in frustration.  If you are an active person, you will find that the low calorie diet is depriving you energy.

Moreover, after the diet is complete, it is difficult to maintain the calorie levels at the 1000 calories.   The tendency is to revert back to the original levels. This will bring the weight back to the original level.

While there are many disadvantages of a low calorie diet, it is an effective way of kick starting a long term diet plan.