I am 5,0 tall and weigh 78 pounds (39 years old). I am naturally thin, but this is not healthy!I had to quit working, simply to survive on the little energy I have. My doctor prescribed antidepressant 2 years ago, but I am not stressed. I lead a very serene lifestyle. I have wonderful relationships and a 3-hr/week job I love. The only thing I complain about is lack of mental focus and ability to have a normal life.I am however, very worried about my future, as my weight keeps going down. It feels like all the food I eat simply passes through without any absorbtion of nutrients. Meals have become hell for me. Gas/bloating/pain have been part of my life since I can remember. What can I eat to gain weight?