Variation may exist because environments have recently changed and genes that were previously beneficial have not yet been eliminated. This may describe

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Non-insulin-dependent diabetes (Type 2 diabetes) is an example of a condition where genetic traits that were once advantageous in past environments (such as those promoting efficient fat storage) may not have been eliminated, despite being less beneficial in modern environments with abundant food availability.

Variation May Exist Because Environments Have Recently Changed and Genes