Yet another 'this is like saying "water is wet"' moment.
One nice thing about my post grad school ordeal/breakdown has been some time to improve my habits. Since early last month, I've been paying a lot more attention to improving my diet and exercising. And now that I have something set up that doesn't start until June, I have some time to REALLY devote my energy to that, especially exercise. 3-5 days a week I go out biking, do some body weight strength training, active isolated stretching or SOMETHING. Since starting I can tell a discernible difference in my strength, flexibility, stamina and energy. Good for body and mind.
I also don't smoke and never plan to. And I don't drink that much, and never more than one drink at a time.
Okay, scientists, now that this is established, used your money to study things that aren't 'well, DUH!'