Actually Ed, I think I read somewhere that electrolyte imbalance, specifically Group 1 metals, can be a factor in a psychotic episode, which could very well include paranoia... but then again, maybe I'm just telling you that because I'm one of them
You're probably getting an ok amount of minerals from salad and meat, but yeah cholesterol might be an issue. The main thing to worry about is salt, because fast food typically contains a lot of it (in Subway it's in the bread). At your age the sodium shouldn't be a problem for your heart, but you do have to piss more to excrete it, which carries away electrolytes and some vitamins. Check this.
How water resistant are the palm side of those mpacts?