How can I gain weight?

Anonymous
I'm thin ... like supermodel thin ... have been like this all my life but now I'm beginning to be more aware of the fact that I'm even thinner recently ... I lost from 5 to 7 pounds over the last year and for my weight it's quite a lot. I weight 110 pounds/50 kg and am 5.77 feet/1.76 m tall.

I can't eat oily foods which as far as I know are primarily responsible for gaining weight ... sweats make no difference ... I don't even exercise more than walking to any destination and occasionally going for a run or simple abs, butt and chest exercises.

There is no boot that will fit my calves and any pants/skirt that I buy it's S or XS in size, and with those I have problems with length. I don't want to get fat,God no, but I'd like about 5 pounds more ... the only problem is that I can't seem to manage even one.
Updates
+1 y
As for fast food ... I hate it and am mostly a vegetarian but I can't say no to milky products, fish or eggs. The reason for which I barely eat meat is because it's oily and I have stomach/bowel pains and discomfort. Even if it's very tasty and I enjoy eating it, I either have to take a pill afterward to calm my stomach or suffer the pain.
How can I gain weight?
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