Kathy Freston

I missed a tuna-fish sandwich with mayo on toasted wheat bread more than anything. Six months after I went vegan, I snuck into a deli and took one home. And, of course, it wasn't nearly as good as I fantasized. It tasted, well, fishy.

We've all seen chicken portrayed as the low-fat, heart-healthy alternative to red meat for years, but it no longer adds up. You might want to lean away from eating birds and lean toward more plant-based options of protein like black beans, lentils, tofu, chickpeas and whole grains.