 [ 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 ] i had an extremely high metabolic rate and was an athlete competing in martial arts i had to gain weight to compete with stronger opponents in a heavier weight class let is keep it simple 3 key elements will allow you to gain muscle massweight 1 rest   get two daysweek of rest to recover from training you grow when you are resting you can split up the 2 days or have it simultaneously take it easy on those days and do not do anything too physical 2 train   lift heavy weights with low reps for 1 12 hour and then do another 30 min of plyometrics next day do it in reverse repeat this cycle throughout the week if you are an athlete you will need to extend training time up to 3 hrs in one day when running do sprints do high impact high intensity exericises do not perform long distance endurance training if you have to run do not go over 3 miles 3 eat   consume a lot of carbs from veggies and fruits 34 of your meal should be carbs to give you energy and pack on necessary fat 14 of your meal should be protein to build muscle contrary to popular beliefs you need plenty of fat storage in order for the body to be healthy and build muscle consuming protein volume based on your body weight is not accurate for everyone some bodies will not utilize extra protein you want that carb for energy to push harder and grow biggerstronger eat pasta rice and potatos with every meal you will bulk up in sizestrength adding 10 lbs of muscle like me within a month if you get too bulky and need to trim down to make weight for athletic competition then reverse the diet eat more protein and less carbs always drink a ton of water find people with similar goals to train with it is not just about building your body it is also about building a community good luck