9. Corn fed beef
Cows are meant to eat grass, but when you’re dealing with a giant worldwide demand for beef, grass just won’t cut it (pun not intended). Instead, many cattle farmers feed their cows corn-based feed: it makes them grow faster, it’s a heck of a lot cheaper, and they don’t have to worry about maintaining a steady supply of fresh grass for grazing. Unfortunately, that corn feed is often GMO corn and full of pesticides. Grass fed beef also has more omega-3s and fewer omega-6s. You’ll pay more for grass fed beef, but you’ll probably have to pay less for healthcare as a result.