If you read deltiologists’ books and any other sources on longevity issues, you will find out that the pursue of longer life span is not new. There are books from ancient times where doctors managed to discover those facts which recently have been rediscovered. One of them is that our life expectancy is directly dependable on the amount of calories we consume. The fewer calories we take in every day the more chances to live longer we have. Authors who support this idea even give a receipt of such dishes which seem to be nutritious however, in reality contain very small amount of calories. For instance, a light broth with dried crusts and a piece of a poached egg and all this seasoned with olive oil. Based on this receipt one famous specialist and author for pharmacy Greg Critser got a title for his book “Eternity Soup”.  He has written several works dedicated to health and longevity. Greg Critser does not only write empty phrases to make money on his books but he also employs the principles from the pages of his books. He says that he had worked hard to change his lifestyle and now he can hardly do without active life style and social engagement, as well as nonstop learning process and moderation in food. These are his main rules. The author stays in great shape since he is the father of diet books and simply cannot allow himself gain extra weight. The book is said to be extremely positive and easy to read. Those who will find some time for it will definitely benefit. He also takes anti-aging Reneuve supplement regularly that he said provided a great benefit in his quest for longevity and anti-aging.