IQ tests may be invalid at determining life success or happiness and we all know exceptions to them, but as a former school psychologist, the ability of the IQ test to predict school success in the United States is accurate, from my experience. This is not to say I didn't have students diagnosed as "mildly retarded" that were better acclimated to adult independent living than some of my students with higher IQ's but the correlation to their school performance was very strong. Then again, what does school performance necessarily have to do with life performance/contentment? And, as to falling off the wagon... I confess to be an intellectual follower of paleo eating but hold a Hershey bar anywhere near me during certain days of my cycle and you may loose a hand ; ) At least the hand would be paleo...