Over the past couple years my girlfriend has lost a considerable amount of weight. She wavers around a little less than 100 pounds and she has a hard time gaining weight. She is 5’ 7" and almost 18 years old. Shes been to doctors and there is nothing health-wise wrong with her that would prevent her from gaining weight. What would be the best way for her to gain weight?? Im just wondering if theres anything other than the obvious things.(like eating a lot, eating protein, etc.)
She also has wrinkles under her eyes which leads to another question: Can losing weight cause there to be significant loose skin in areas like under the eyes?? Her doctor said that gaining weight will eliminate the loose skin under her eyes, but im skeptical.
Any information or opinion is greatly appreciated. Thanks.