Eat less, live longer?

The latest evidence suggests that while calorie restriction is indeed beneficial for humans, when it comes to lifespan extension, it may not be the whole story.

"There's a definite possibility that if you balance the diet correctly, a longer lifespan can be achieved without full food restriction," says Matthew Piper, a researcher into ageing at University College London.

While lifespan is reduced if calories are cut too drastically, it can be extended by cutting them moderately.

Needless to say, this lifestyle is not for everyone. Some people report struggling with hunger pangs, and the society warns on its website that side effects can include feeling cold, poor wound-healing and temporary infertility.