Do you believe that what you eat and do in your youth affects you at all ....

Yes of course ,look what I look like from all the junk I ate when I was younger

I think it sure has a huge impact. Say you eat a lot of oily/fatty food, you tend to get cholesterol which lead to heart diseases. If you eat a lot of sweets, you tend to get diabetese. I know that eating sweets only doesnt lead to diabetese. But if you have a weak organ, you tend to get. If you eat a lot of fast food with monosodium glutamate, you tend to get cancer. All these are not 100% sure, but possible. So i think, you have to watch what you eat.