Why is being healthy so expensive?

So I went grocery shopping today. Once I got there I started looking at all the fresh foods. And the prices are a bit crazy. Now if it were just me they wouldn't be so bad but we have a family of 6. And cooking 2 meals is just out of the question so whatever I fix myself I have to fix x6 And that can make for a very expensive meal. Yet junk food is so cheap. I mean you can get a package of cookies cheaper than you can get a bunch of broccoli. And HOW do they expect us to not be overweight? I finally settled for frozen because they don't have the price tag of the fresh but they are still better than cookies and grease right? I really wish I had been able to plant a garden this year. I would have all the fresh veggies I could want. Oh well Maybe next year. Until then...I think I'll hit up the farmers market.