San bernardino county, california is the largest county in america
Jamestown was situated on a site that was too secluded for agriculture, in fact, the entire island was isolated because it was swamp-like and infested with mosquitoes and the only water came from tidal rivers. This water was unsafe to drink, which could cause health problems such as cholera, typhoid or dysentery. I give credit to @Barnuts
But i agree with this but hope this helps.
I believe the answer is: People diagnosed with hypertension.
Studies shown that consuming sodium would increase the chance of blockage within your blood vessels and tend to lead to high blood pressures. American heart association recommend people to not consume more than 2,300 mg of sodium to avoid this occurence.