The following post is a question answered by Frank Dolan from the Nike Training Network on the Nike Training Club App.
Question: I'm 20 year old I'm lean but I want muscles tell me some foods that can help me and workout also.
Answer: Assuming that you are doing the basics (like getting a mixture of carbohydrate, fats, and high quality protein in each meal), I would consult with an experienced nutritionist or dietician in your area to make sure you are getting enough of what you need to reach your goals. This recommendation should be specific to your body type and activity level as well as be monitored by a professional in the field of nutrition.
See NTC App: https://apps.apple.com/us/app/nike-training-club/id301521403