You'll be fine with it! Our school has a "nude food" policy and there is actually competition from the kids as to who can have the least rubbish. The class rooms also compete with it.

The other reason I found to stick with it is the cost. All the bars and snacks cost a fortune (when I haven't baked on the weekend I hate spending the money on them) and I also found the boys got bored with them and if I get lazy they whinge for cookies or slice.

Lastly I try my best to stick to a numbers free diet and commercial snacks are full of additives, preservatives and colours. Even natural colours can set off reactions according to the failsafe diet.