Is it wrong to use genetic testing to motivate behavior change? 

For example, if my genetic code suggests that I am at risk for developing diabetes and, as a result, I modify my diet and exercise regimen - that's a good thing, right? However, one could argue that proper diet and exercise is a good thing, irrespective of what my genome says. 

There is an emerging trend of using "genetically informed" diets or exercise programs for patients, elite athletes, etc. Could the results, however positive, simply be a placebo effect?