To get a general idea of ​​how many calories you  

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should eat to gain weight, Kalman recommends starting with these calculations: Women: 12 to 15 calories per 500 grams of your weight, multiplied by 1.3 or 1.5 if you are active. Men: 15 to 20 calories per 500 grams of your weight, multiplied by 1.2 to 1.5 if you are active. …

Having the body you want is possible if you know the

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 right way to increase muscle mass . Which food do you choose? BuzzFeed Life consulted two experts on the subject: Douglas S. Kalman, director of nutrition research at QPS-MRA, a deportologist at Florida International University, and co-founder of the international sports nutrition society, and Tony Gentilcore , Expert in strength and conditioning,…