Does eating less extend your lifespan?

So. Do you live longer or does it just feel like it?

Study: Super-skinny won't live longer - Diet & Fitness - MSNBC.com: "
They came up with a mathematical model based on the known effects of calorie intake and life span.

“In Japanese populations, for example, the normal male diet is approximately 2,300 kilocalories (calories) per day,” they wrote -- and the average life span for a Japanese male is 76.7 years.

“Sumo wrestlers, however, consume an average of approximately 5,500 calories per day and have a life expectancy of 56 years,” they added.

People living on the Japanese island of Okinawa eat somewhat less than the average Japanese. They also live slightly longer. This could give a basis for calculating the benefits of eating less.

Calculations based on the Okinawa and sumo wrestler data suggest that if Japanese people ate just 1,500 calories a day, the longest average life span attainable would be just under 82 years, Phelan and Rose wrote."

Interesting study, let's see them try that in America, where we sue french fry distributors.