What foods should i not eat if I have chicken pox and which foods are best to eat?

What foods should i not eat if I have chicken pox and which foods are best to eat? Also, is it okay to eat chocolate... a lot? I have some chocolates with me and I will probably finish eating them in one day if I start eating. I am not that fat. I am 14 years old. About 67 kg and about 165 or 170cm