Apparently two studies so far seem to find a link between Bisphenol A (BPA) absorption and obesity and type 2 diabetes. In the last decades canned beer has become more and more chosen over bottled beer, and same for soda; you can also find BPA in canned food.
So you could maybe think that the rise in the number of overweight people (if it happened) is partly because of the increase in absoption of some chemical substances that are used by industrials in our food/drinks. In short: some people might be overweight cause they buy canned tomatoes instead of fresh ones!
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