What do you think about Calorie Restriction Diets to live longer?

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I need some opinions. I am a weightlifter, and I'm a 29 year old male. Because of the nature of my training and the demands I place on my body, I eat a lot of food, usually between 4,000 and 5,000 calories per day. Now don't get me wrong; I'm not fat AT ALL. I am extremely fit and have low body fat. I have no issues with my looks at all. In fact, I get a lot of attention because of my looks. Now here's what I want some opinions on. There are studies suggesting that by slightly under-eating you can greatly extend your life. Here is a site with more info: http://calorierestrictiondietplan.com/ That sounds great and interests me because I'm obviously interested in being healthy, but if I were to adopt such a lifestyle I would lose all my muscle as my daily calorie intake drops to below 2,000 per day. I am 5'9" right now and 190lbs and around 8% bodyfat. If I were to adopt this kind of diet I would drop back to my super-skinny pre-workout weight of 140, and I REALLY don't want that. So the rational side of me wants to keep doing what I'm doing and keep being very attractive, but the health-conscious part of me wants to make sure I live a long time. In fairness, this is the blog where I first hear about this type of diet: http://www.bloglines.com/blog/bderry2 What do you think? It's basically two lifestyles that are on opposite ends of the spectrum. Help!