Are there any other examples in nature of environmental factors causing obesity?
One common example is the fact that while cats who live totally indoors and eat human food, tend to become very fat, those cats who live outdoors (or spend a lot of time outdoors), eating the traditional cat diet at least in part (i.e. mice, birds etc) do not get fat at all. Cats who reside totally outdoors tend to be on the lean side despite having a big appetite.
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