How to gain weight?

Tips for gaining weight?
I am a 5'8 girl who is 109 pounds. My mother is constantly telling me im anorexic and it really gets to my self-esteem. I love fruits and vegetables, so I know I could probably eat more fatty meats? I don't like anything greasy as it makes me feel sick easily. I DO eat tons of cookies/pastries already - but I seem to have a very high metabolism.
How to gain weight?
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