https://www.reddit.com/r/NoFap/comments/1d2qlh/overmastrubation_zinc_and_copper/ This guy reckons you can get a deficiency from masturbating. You lose 0,3585 to 0,7055 mg zinc each load." Its possible along with bad diet and lack of exercise. Me personally, i think i could be low. I masturbating myself to exhaustion and used to get serious pains in my penis. A burning pain that hurt so bad... but thats irrelevant lol. Ive always had white spots on finger nails and thought it was from lack calcium. Drinking pints of milk a day did nothing. It could well be a zinc deficiency, as lack of zinc can cause white spots on nails. Im healthy but i definitely dont meet my food needs and is why i supplement things. He also says that a zinc deficiency can cause copper toxicity. So if you start supplementing, get one with a zinc/copper combination.