I know it's asking a lot. Maybe more than some people are willing to pay. But, if you want to live longer, would you be willing to eat less?  A lot less? In fact, on some days, you’ll eat almost nothing at all.

Animals can have their life expectancy extended by up to 40% by using a calorie restriction plan. Such a diet could even protect against common age-related diseases like cancer and diabetes.

Alternate day fasting (ADF) research indicates there are weight-loss benefits to eating fewer than 600 calories every other day. If you can tolerate it for your diet, you are given a free pass to eat almost anything you want on the alternate, non-restricted,  days.

There is some need for caution though. The experts suggest fasting only in a clinical setting because severe caloric restriction could be dangerous for some individuals.

[BBC]