If you want to make diet choices that help the planet, the most common and effective advice is to eat fewer animals and more plants. But there are so many other choices we make that impact our land, air and water. Rice is the most harmful of all grains, making others such as millet or buckwheat a better choice. Peanuts use less water than almonds and vegetable oil is better than butter, among many other potential choices. It also turns out that prioritizing produce that's organic, local and in-season also make a difference. Oh, and don't forget about avoiding food waste.