 [ Symptoms ] i have a very high metabolism and i can not gain weight how can i lower my metabolism while exercising more  i am 20 years old 6 tall and weigh only about 150 155 i am also not very active i want to start running and lifting weights but it is tough for me to gain muscle because i have a very hard time putting on weight what can i do to lower my metabolism enough to start putting on weight and getting bigger i also do not eat very well but tend to eat a descent amount of protein every day [ Disease ] hi i realize you have uti however my opinion is that you have splenomegaly which can cause failure to treat uti so i recommend that you get your spleen checked and treat it accordingly first step will be doing a cbc test and doing an ultrasound good luck