A 1000 calorie diet is a very low calorie diet, contraindicated in the long term for most people, but indicated for those who have difficulty losing weight due to a very low daily calorie requirement.

1000-CALORIE DIET: WHO IS IT SUITABLE FOR?

For example, if we have a calorie requirement of 1500 calories, as in the case of very sedentary women over 50 or 60, or inactive women who are over 40 and are short in stature, a 1000 calorie diet allows them to lose 2- 3 kilos per month.

However, the advice is not to continue it for a long time.
For example, every 4 weeks of dieting it is best to take a one to two week break in which you eat everything but in moderation. This intermittence avoids metabolic slowdown and can allow you to continue losing weight.
In any case, inform your doctor before starting a diet, especially if it is low-calorie or restrictive of certain categories of foods.

Furthermore, even in the above cases, it is necessary to increase the daily energy expenditure with physical activity, in order to raise one’s daily requirement. Women who do not like sports but have a low daily calorie requirement can, for example, walk briskly for an hour a day.

A 1000 calorie diet for a week can also be a useful test for all people who say they can’t lose weight but fall into the above cases.
If in a week of this diet the weight does not drop, in fact, I suggest to do some tests to evaluate the thyroid or other hormonal problems (estrogenic excess, for example) that block weight loss, and to reduce the sources of stress.

On page two we see the weekly plan of a 1000 calorie diet.