My biggest problem is LCing at school.
We have 2 options:
1.) Pack Our Lunches
2.) Buy our lunches.

My tips are pretty simple and can keep our appetites at bay all during the day, and we wont have to carry around a Lunch Box.

I dont know how it is at your school, but at mine, we carry around our back packs. We're allowed to chew gum, and have food/drinks in class. Anywho, these are my tips:

I carry around baggies of easy to eat foods:
nuts (just plain, shelled walnuts: carbs 3g) Almonds are good too!
Pork Rinds (some call them craklins, carbs 0g. Fiber 0g.) you can also get them in different flavors, so look at the back to make sure.

And for lunch, so i dont have to lug around somthing big...
The tuna in a pouch (if tuna is your thing, if not, they sell canned chicken, and If I'm not mistaken, i think i saw some chicken and ham in a pouch. Look and see what you can find, the grocerystore has endless possiblities) I grab a pack of mayo, buy a bottle of water and snatch some pickles and eat that stuff up.

ANY MORE TIPS?!?! We CAN SHARE AND LEARN! hah! What do u guys do in school?