I took brewer yeast to gain weight for two months but no result what is the solution ? thanks

Eat more: Eat more calories than you need in order to gain weight and do resistance training, since building muscle is a great way to gain weight . How many calories you need depends on your age, level of activity, height and weight, Choose healthy oils and nuts, and eat from a variety of foods. Nuts are energy dense and have lots of calories in a small volume- Best to you