I found someone on this blog or whatever who seemed to know more about the acat mutation, seems its involved in fat metabolism and energy production, and it can cause depletion of b12 levels.
(And reduced Energy generation)
Maybe this is one part of why It is hard for me to put weight on? My whole family is pretty skinny on my dads side, moms side as well.
I get all my supplements I ordered tomorrow so I will start slow and post progress here!