Why can't Nutrition cure compared to Medicine

i think diet can prevent and even at time cure.

Actually it can and does. Being a carpenter I've been in a lot of pain - and once I was working for some doctor lady who gave me a sample of prescription pain drug (which was later taken off the market after it killed a few people). And it worked! It removed about 25% of the pain I had, and I was very impressed. But I did know it was fairly dangerous and you had to get your liver tested often if you took it to see if it was killing you. So I didn't continue with it.

Then later I did the Atkins diet where you quit eating a lot of the garbage that's in the "American Diet" - and I could tell I was onto something in three days - the pain began to disappear. At that time I could hardly walk for the pain in my feet - that took probably 2 months before it went away - all 100% gone - no more ibuprofen. I had a torn shoulder which hurt like fire, and that quit hurting in about 8 months.

I tried to tell the doctor lady this (who's business was pain), and she just gave me "that look" which said - "Sure, you poor stupid bastard". The pain I had has now been gone over 10 years. Had I taken her sacred medicine, I'd probably be dead now from liver failure.