Olive or Canola oil (non-hydrogenated) and as for spices cinnamon, cayenne and all known pepper spices. Other food that are good are flax-seed oil and Omega 3 fatty acids like those found in fish. Grapefruit is great and so is canteloupe. Always make sure you don't have allergies to certain foods. There is no one magic food that causes weight loss. Eat all foods in moderation.

There are some oils that are considered essential good fats, like fish oil or anything else that contains omega3's like flaxseed oil. If you're trying to lose weight though you're not going to do it by eating anything extra.