The 1,000 calorie-a-day diet involves severe calorie restriction, which can be dangerous and may cause rapid weight gain afterward. Learn more here.

A real long-term risk of low-calorie diets is gaining the weight right back (and then some), especially when your diet is as restrictive as this one. A 2015 long-term outcome study found that ...

Proponents of the 1,000-calorie-a-day "Military Diet " claim it can help participants lose up to 10 pounds in three days. The strict meal plan includes low-nutrient items like hot dogs, ice cream ...

Is the 1,000-Calorie-a-Day Diet Safe? A 2013 study suggested that prescribing 1,000-calorie diets versus 1,500-calorie diets is more likely to result in significant weight loss for obese individuals.