Risen Ingredients

I'm at level 16 and obviously have a lot of time invested. But I have a question; silly as it may seem, I can't find the answer.

Are apples, eggs, and cheese only for hit points and experience, or will I need some for recipies/potions later on in the game? Also, am I free to sell all my weed or should I keep some of that too?

I really don't feel like starting over from scratch if I've made the wrong decision.

Thanks!

Sell your weed to the guy in the bandit camp, there's no other use for it. You get +1 strength for every 10 Apples you eat.