Avocados are high in vitamin E. They also happen to be quite high in fat, which depending on your goals could be a good or bad thing. The good thing is that if I haven't been too active recently I can eat a whole avocado for breakfast and feel pretty satisfied until the afternoon. Even if I have been really active, the fullness brought on by an avocado will keep me from eating junk later on.
1) eat real food - more vegetables, moderate meat, moderate fruits, less grains, less sugar, less vegetable oils.
2) exercise - moderate intensity cardio, sprinting, heavy lifting, dedicated stretching and mobility.
3) live - relax, de-stress, meditate.
Disclaimer: I'm not professionally qualified to make any formal recommendations. I've just done my homework and I'm my own guinea pig. All of my data, unless otherwise cited, comes from a sample size of n=1 (me).