Who would 당신 say this? Sunflower seeds are salty for no reason... why would 당신 ask this question? Say something like this on Google, and don't tell people to shut up of shut the hell up, 당신 can get hated for a reason so just... 신고 the 질문 and never think about it, just get some confidence in 당신 at least
TOO much salt can kill you. There are unsalted sunflower seeds and salted so no they can't kill you. You'd die if 당신 for some strange reason decided to 제비, 삼키기 lots and lots of salt. Eating one of those sunflower seed packages won't.
I don't know why sunflower seeds are salty, but I'd guess that salt is a side product of one (or many) of the metabolic reactions in the plant itself. Salt can only kill 당신 in high concentrations, but the same goes for anything 당신 eat. Too much of something is always bad. Drink too much water, for example, and you'll die. 당신 just have to be moderate in what 당신 eat. If 당신 eat sunflower seeds, try to eat other foods with them that have a low salt concentration.