You avoid food by not eating. And, if that is what you want to do you are a very mentally unstable person. If you mean what kind of foods to eat to be healthy, then look at any healthy diet section on the net or talk to your doctor or nutritionist.
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Instead of snacking on all these high calorie foods when you're blitzed, try sucking on a sweet instead. it really helps. the munchies do not stay after you're sober. it's only when you're stoned that you get an attack of such. peace.
If you are trying to lose weight you should only do it in a healthy way. Cutting out all food will backfire after your metabolism breaks down. To keep yourself from eating junk food you should make yourself believe that eating those kinds of food will harm you in the long run. Try new kinds of healthy foods to find things you like, but keep your distance from those foods that are bad for you.
If you want to avoid junk food then don't eat it. Ask anyone if the food you want to eat is junk food if it is leave it or throw it in the bin, that way you wont be tempted to eat it. If your a really fussy eater such as me then just excercize, run each morning, and drink lots of water. But do not eat too much junk food you can only eat junk food once or twice each week.