Gaining weight... In a healthy way?

Anonymous
What's a healthy way to gain weight? I had a metabolism test yesterday & the guy said I'm underweight and my metabolic age is 12 years old (I'm 21 though). I eat normally... I don't have an eating disorder or anything like that & I don't do any strenuous exercise. He said I should drink some protein shakes to bulk me up... Is that right?
Gaining weight... In a healthy way?
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