Going veg/an as a 21 year old actually made me focus on nutrition in a way I might have never otherwise done. You become an expert at reading labels, and there is a lot of people going veg/an for health reasons (even though that wasn't my motivation) so books/magazines/cookbooks had a lot of nutritional info. The best thing for me was instantly cutting off all the junk I used to live on: 7-11 hotdogs, Lil' Debbie's, McDonalds, etc. I don't even see that shit anymore. It's completely invisible to me.