"A 1,300-calorie per day eating plan is typically short-term and often used for quick weight-loss goals," says Valerie Agyeman, RD, a women's health dietitian and the host of the Flourish Heights ...

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.

The 1,200 calorie diet plan can lead to weight loss in as little as seven days. But there are risks to such meal plans, experts say.

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.

Adele has been warned her 1,000 calorie-a-day diet "isn't sustainable" by This Morning's health expert. The singer's rumoured eating plan, which reportedly which helped her lose seven-stone, had ...