Calorie-restrictive diets are showing promise to potentially treat an array of medical conditions.

Scientists have investigated the effect of extremely low-calorie diets on a range of illnesses, from autoimmune diseases such as multiple sclerosis to asthma. Other researchers have evidence the diets may help to prevent diabetes and cardiovascular disease, and studies are under way to determine if they can extend survival in cancer patients and reduce side effects of chemotherapy.

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