sure, but with regard to covid the main issue is to have a immune system that is at least somewhat normal. If that exists, covid won't even cause a symptom.No PUFA means better blood sugar regulation, making one closer to attaining optimal blood sugar regulation. When optimal, stress hormones are minimized. Low cortisol, low insulin, low PTH. Low cortisol - better thymus gland functionality - more T-cell that can mature. Low insulin- more endogenous production of vitamin D. With activated vitamin D, and with dietary calcium intake, low PTH results.
Low PUFAs is very important. The cascade effect stemming from high PUFAs in the system stemming for its effect on blood sugar regulation is systemic.