How as a girl can I gain weight?

ElectricWhisper
OK so I'm 145cm 45kg (5'1'' 99lbs for those who use the standard system) my whole life I've been underweight, and I'm so over it. No matter what I eat or how many calories I consume I don't gain any weight. I read somewhere that dairy helps you gain weight but I'm slightly lactose intolerant, so that's out.

Is there any tips to help me gain weight?
How as a girl can I gain weight?
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