How to gain weight healthly?
By adding protein to your diet and doing weight training.
by eating what you want but dont eat to much
Gaining muscles is the healthiest way, but also the hardest...
By eating healthy portions of healthy foods and by doing weight training. Muscle weight will keep your metabolism going at a higher pace. It will help you burn off fat and will make you feel better.
Protein and weight lifting
Join GYM and take food properly, It help to gain your weight. After joining the GYM I gain my weight 8 KG with in a month.