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Biologists have set out to tackle a very big mystery: Why are we so fat? The simple answer - eating too much and exercising too little - may mask a far more complicated culprit involved in the obesity epidemic. A recent study used data sets for 12 groups of animals with both male and female species observed. All 24 data sets, containing information from over 20,000 animals, showed an overall weight gain in their populations. While some animal groups had increased access to richer food supplies, and others showed declining activity levels, no factors were consistent throughout the groups. This suggests that obesity is effected by many different factors, requiring many different solutions.
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