The Honolulu Advertiser notes that analysis of a large study performed a few decades ago convincingly links calorie restriction with extended longevity in humans. "There are a lot of people that change eating habits over time. The fact you can see a difference, almost 40 years later, despite the weakness of the measurement tool, suggests this must be a fairly powerful effect." This is as we would expect from the many animal studies, and we will no doubt hear more about this work: "[the link between diet and life span] is one of the great unanswered questions in biogerontology studies and aging research. A study like this just hasn't been done before. And the fact that it supports what we see in the animal studies is important."