The good news with this one is that you can get some extra time on the clock. If you're overweight and lose some pounds, that could actually add years on to your life.
On the flip side, overweight (a BMI of 25-29) people have been proven to have a longer mortality compared to average-weight or obese people. So although it's important to maintain a healthy weight, if your body naturally holds on to a few extra pounds, that could actually be a good thing. To sum it up: obesity = bad, morbid obesity = really bad, normal weight = good, and being slightly overweight = also good. Science, man.
Not going full rockstar with the booze and drugs
It's pretty obvious that abusing hard drugs is a slippery slope that can lead to overdose and an early death. Hate to break it to you, but drinking too much alcohol falls in that camp, too. It doesn't matter if everyone else in your band is doing it! You're not them!