Who would آپ say this? Sunflower seeds are salty for no reason... why would آپ ask this question? Say something like this on Google, and don't tell people to shut up of shut the hell up, آپ can get hated for a reason so just... رپورٹ the سوال and never think about it, just get some confidence in آپ 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 آپ for some strange reason decided to نگلنا 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 آپ in high concentrations, but the same goes for anything آپ eat. Too much of something is always bad. Drink too much water, for example, and you'll die. آپ just have to be moderate in what آپ eat. If آپ eat sunflower seeds, try to eat other foods with them that have a low salt concentration.