Genes contained DNA can be turned off and on through several methods. One of the most promising ways of altering genes is through epigenetics. Many studies have indicated that the environment plays a role in activating or silencing certain genes. Most of the changes attributed to epigenetics only last for one generation meaning they may not be passed on to offspring.
Epigenetics has been offered as one possible process affecting obesity. An environment of high fat/fast foods may turn on a gene promoting weight gain while in another eating environment, this gene would be silenced.
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