How to gain weight without taking any protein supplements? and if do wanna take some protein supplements, what protein supplements should i take?

Why gain weight?: If you are otherwise healthy, being skinny is not a disease and you should not try to gain weight. You will gain weight as you age and then will look back at this time fondly, when you could eat and not get fat. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.