hey!! there's lots of healthy fats that are good to add into your diet such as; nuts, avocado, peanut/nut butters and coconut oil. Also just try to make sure that you aren't skipping any meals, try to eat at least three decent sized, well balanced portions a day if you want to gain weight! Things like smoothies with nuts/nut milk/coconut milk added are also good. If you're not sure why you're loosing weight try writing down what you are eating and checking if it's really enough, also remember that a little junk food/treats aren't bad in moderation, also things like building muscle can help if you're into that. I used to have serious weight problems and I started to gain weight around the same time that I started to get interested in cooking, cooking meals for myself made eating and making meals much more interesting, so that's always an idea if you don't already, good luck!
