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Calorie Restriction and Quality of Life

I've read detailed studies of calories restriction - some studies have been conducted on humans - as well as one of Walford's book, and although life extension could certainly be an outcome, so can depression and lack of sex drive. Most likely, some calories restriction is good, but the typical lab study on animals uses a diet designed to keep study subjects' weight 30% below litter mates, which is untenable in humans.


While very low weight is associated with loss of sex drive and depression in humans, numerous qualities are associated with increased mass, such as intelligence, popularity, happiness (some studies), and longer life; a few recent studies have shown all-cause mortality to be lower in the moderately overweight. 

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