For those who have a very fast metabolism and find it difficult to gain weight even with a 3000 Kcal diet, we present a diet to gain muscle mass with around 4000Kcal.
It is a diet that will guarantee even those who have difficulty gaining weight gain muscle mass.
It's important to note that if you have a slow metabolism, it's probably best to start with a lower calorie diet, e.g. 3000Kcal.
To find out how many calories you need for your diet to increase muscle mass, consult This article.
Follow this diet for at least a month and follow up with a good training plan, at least three times a week, and you will gain quality weight.
You can replace foods with similar foods, for this consult our nutritional table.
Don't forget, this is just a generic diet, and the ideal is to build something adapted to yourself.
Don't you know how?
See article: How to go on a diet.
Another article that may be useful to you is What to eat to gain muscle mass.
You find here Several training plans to follow your diet and get good results.