The BEST diet in my opinion is what is called today the "flexitarian" diet. It's how I've always eaten, and now they call it a "special diet". It plain common sense. Eat mostly fruits, vegetables, legumes, and whole grains. Focus on more protein from plants instead of animal protein. Try to stay flexible and incorporate some (but not much) meat and animal products from time to time. Eat the least processed, most natural forms of foods. Try and stay AWAY from junk foods. Limit added sugar and sweets, raw honey and sugars like xylitol are fine in moderation.