Ten years from now you will ask "What foods will help me lose weight" Enjoy being thin because it won't last. BTW Fattening foods are usually not the healthiest, and may give you health problems later in life.
im cringing .. dont listen to them. go with bananas, especially if u make it into a milkshake with vanilla ice cream, peanut butter by the spoonful or on toast with banana, a sandwich with pb&jelly, pb on crackers with banana or jelly. Butter, margarine on pasta potatoes, or bread
If you're not allergic: nuts. Avacados, cheese, high fat yogurt, high % milk, use lots of olive oil, dark chocolate. More specifically: boost/ ensure/ carnation breakfast essentials drinks, chunky soups, and granola.