Answer:
Digital white-out.
I can be in your body but never on your placemat. I'm always better when I'm fresh, but you'll never see me in the flesh. What am I?
What has keys but no locks a space but no room and you can enter but can't go in?
People buy me to eat but never eat me. What am I?
You throw away my outside, you cook my inside. Then you eat my outside and you throw away my inside. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.