If you want to live up to a hundred years, research said you should start cutting down on calorie intake. By eliminating wheat, sugar, dairy, meat and cooking at high heat, studies said you can reduce calorie intake and live longer.

According to those who are currently on calorie restriction, changing their lifestyles might help them live long enough to see their great-grandchildren grow up. They said that they can live longer by monitoring every single food they take in.

In an experiment, people who took about only 1,500 calories a day emerged as having healthier body organs than anyone of their own biological age. Roy Walford, author of the book “Beyond The 120 Year Diet: How To Double Your Vital Years,” was in an experiment where they were sealed in an airtight atrium in Arizona for two years. He only ate whatever he grew in the room (totaling to about 1,500 calories). He emerged from the experiment healthier than his contemporaries.

The thing is, this kind of diet is almost bordering on anorexia and eating disorders. Eating less is, of course, better for everyone. But still there are some instances when we need a little bit more calories in our life.