In reply to Removed Userjoejyxiberras:
hmmm. lots of shitty answers to what i'm guessing is a serious question.
You look like a young lad in your picture, so i'm going to go ahead and assume you are. With that in mind, all these comments about essentially eating nothing are more or less the worst possible thing you could do. You're growing, you're training (if you're interested in competition climbing i'm going assuming training quite hard) and all this needs calories. And plenty of 'em. Make sure you're getting three solid meals a day and if you're peckish, go ahead and snack. Weight (so long as it's not just lots-o-fat) will help you train more, protect you from injury, and in the long term keep you training and getting stronger.
So long as you're diet isn't terrible, what you do in the gym is more important than what eat. You need to fuel that training. Learn to love peanut butter. Try to find the 'just peanuts' stuff. In big quantities it can be quite reasonably priced too.
In terms of more detail on what to eat: Try to eat 'clean'. That is, if you can't really picture where it came from in nature, or if there were lots of things done to it to get it into the state you're about to eat, put it down. As much as possible you wan't 'real' food. There are pretty much no universal dietary rules that everyone seems to follow, everyone is different and people succeeded on wildly varying diets. If there is one common denominator it's fruits and vegetables. Lots of 'em. Few calories, high nutritional quality. You literally can't eat too many. They'll keep you healthy, energised (again, training!) and give you nice skin. Girls dig nice skin.
Try to get regular protein. don't stress too much about this though. You're probably doing ok.
Absolutely do not be afraid of 'fatty' foods. Of course here there is some discretion involved. Olive oil and seeds, ace. Suasages, maybe not so ace. fat is fuel. use it.
and finally, most importantly, if you want to get good, get coach.
Rest plenty.
Don't get injured.
Probably, everything you've ever been told about food (including this) is at least on some level horse feces. Pay attention to your own body. Aim to feel good.