Absolutely, bit by bit, day to day. It won't happen over night. I already advocate to anyone within my radius to give up Fastfood or anything that doesn't do a body good.
IMO leading by example is the best way to get it through everyone's head. For those who don't see me exercising 5 days a week (at the least) and eating healthy organic, I'll tell you right now. I'm doing it, and it feels good.
Too many friends and family have fallen victim to diabetes (we Latinos LOVE to eat sugar. We love it!). Enough is enough. Say no to soda (I'm being serious). It will kill you before you're 60.