What is a bulletproof diet?

This is a diet plan invented by Dave Asprey. It's not especially for weight loss, but most people do end up losing weight if they stick to it. It's very similar to a paleo diet in that you go for the most organic foods you can find - grass-fed beef and pork, free range chicken and eggs, grass-fed dairy products and organic veggies and coffee. The idea is to cut out everything with gluten or mold or chemical additives. Here's a link to a basic "roadmap" of the diet plan.