What does lifestyle have to do about overweight/obesity?

These lifestyle modifications can also help prevent obesity if you are overweight or otherwise at risk. Achieving and maintaining a healthy weight through diet and exercise can also help manage or reverse some of the serious conditions associated with obesity, such as hypertension and type 2 diabetes.

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your question:What does lifestyle have to do about overweight/obesity?

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"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."