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A recent study reveals that a reduction in calorie intake can lead to greater longevity. The study conducted at New Saint Louis University and reported in the journal Rejuvenation Research in June 2008, found that by reducing calorie intake by between 300 and 500 calories per day led to the reduction of triiodothyronine (T3) which is a thyroid hormone. This in turn led to a slowing down of the metabolism and accordingly the aging of tissue in the body.