Primarily with preventative measures:
- Exercise: weightlifting 4x per week
- Meditation: 15 minutes daily in the AM
- Diet: Paleo-ish, I initially did the "4 Hour Body" diet to lose some weight and noticed I felt better all-around not eating bread/heavy carbs. On the other hand, bread is delicious. Mostly, I just try to avoid tons of sugar/insulin spikes.
Being disciplined about these things is pretty critical for me.