[Pink.Chiffon]

If you want a good way to add fat to your diet (which healthy fat is very important), I recommend a high quality MCT oil. It's an extra of coconut oil (also very good for you but the flavor can be hard to work with) that only has the most efficient burning fatty acid chains in it. A good quality one (I like Bulletproof) will have little to no coconut flavor and is easy to sdd to anything and to cook with. It also is stable at much higher temperatures than other cooking oils.

I have a hard time gaining weight too as I have to keep gluten (read wheat) out of my diet. Before taking gluten out, maintaining a healthy weight wasn't difficult. My guess is for most people wheat is a good way to put on weight.

Hope this helps!