I posted this life-tips guide in another thread. Here's the relevant portion:
- eat healthy. this is something i only started doing recently. after a month you realize "oh crap why did i never do this earlier?" eat some dang vegetables. cook some good food every once in a while. i've recently started looking at every food as having a tasty to bad-for-me ratio, and i wish i did it through high school. grilled chicken, bell peppers, and asparagus? pretty tasty, not bad for me. i should eat this. country fried steak, mashed potatoes, and gravy? very tasty, but also pretty terrible for me. i probably shouldn't eat this unless it's really good.
- this also ties into the health thing but i couldn't find an easy transition. buy a big bag of carrots. every time you are "hungry" for potato chips or whatever terrible thing it is you want to eat, say "am i hungry enough to eat some carrots right now?" if the answer is "no", don't eat the damn chips. if the answer is "yes", go enjoy some delicious carrots, dude.
Theses things are super simple, but eating (at a minimum) "decently" will make you feel 100 times better than eating processed, fatty bullshit.