I don't like being skinny. I've been skinny my entire life. Last year, I was 6'0 and 135 pounds. I started working out and eating more. I'm up to 160 and look a lot better. I don't look like I'm starving, I fit in my shirts a lot better, etc.

If you want to gain weight and are interested in a food hack, buy lots of milk. Over here it's about $1/1000 calories. You can't beat that. I drink half a gallon a day and it's done wonders for me. You probably want to be weight lifting if you do this though.