Hello dear. Thanks for Sharing your concerns. Yes you can add honey in milk but honey alone won't help you to gain weight, this may also cause in fat gain in your abdominal area. For proper growth in your body and good weight gain that too in the form of muscle mass. Unfortunately you're not having that, need not to worry, you can have that. Share your contact details on my Facebook page named Dieititian Shreya or visit our website www.dietitianshreya.com