Tomatoes are really easy to grow and don't take much effort. If you're going to pick one thing, I'd say that tomatoes have the biggest payoff. You can get a pretty big yield out of a couple of plants, and they need little care beyond watering. More than health, I think that the payoff with growing produce or finding a good source for it is the fact that you have stuff that's much more appetizing. It's tastier, jucier, isn't coated with wax, etc. The really nasty stuff that actually can have a negative health effect tends to come in boxes, cans, or jars. Restaurant food is generally bad too. The best thing is to make food from as close to scratch as possible. In some cases, that's really easy, and in other cases, it's a ton of work. A happy medium would seem to make the most sense. It's worthwhile to read labels to understand what you're getting. That way, you can choose shortcuts that minimize the nasties. As an example, I've seen pre-made pizza crusts with 300mg of sodium (in the whole crust) and others with 1500mg or more. A quick and fairly unwelcome way to become familiar with how bad certain foods can be is to have a family member become subject to dietary restrictions. More often than not, these restrictions involve either sugar or salt. And more often than not, it seems that these restrictions necessitate a major change in eating habits. I kind of figure that if I can develop at least a few good habits now, the transition will be easier when it's my turn to be restricted. That's not to say that you have to totally avoid everything bad all the time; "treats" are definitely permissible for most people as long as they're not an everyday thing. I tend to eat whatever I please when I go to Miller Park, for instance.