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 ...

A 2,000-calorie diet meets the needs of most adults. But your needs may vary depending on age, gender, weight, height, activity level, and weight goals.

Creator Dr. Sanford Siegal says his diet works because the cookies suppress hunger. "We shoot for 1,000 calories a day. 500 of those calories come from the cookies, 500 comes from the dinner.

If you eat at restaurants, you've got a 90% chance of eating over 1500 or 2000 calories per meal. With these tips, you can save 1000 calories per meal. Otherwise, you'll end up eating over a full ...

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.