Hi, I have low testosterone level (400 ng/dl) and I have been struggling to gain muscle. Recently I was down with viral fever and lost almost 10 kgs of "muscle". I literally lost most of the weight from the upper body. Now I am trying to gain weight. Someone adviced me to takeup meal supplement like mass gainer which will provide high carb and protein to bulk up in couple of months and after that I can stop using it. I go to gym everyday. However, there is no luck in gaining upper body muscle. I was having chubby cheeks, but now I look gaunt with narrow bony shoulders, sunken cheeks and eyes. However, I have some fat in the waistline and things which I think is because of low t. My waist is 36" and chest is 34" and more fat in thighs. How do I gain upper body muscle and loss lower body fat in around 3 to 4 months?