Covid-19 is a very strange disease, it seems like it is amplified either way (severe vs. non-severe) depending on health. This seems different from the flu as the flu hits everyone very hard, the elderly/sickly especially hard. With covid some people who have it, do not and will not have any symptoms which cannot be said for the flu. I feel like the insulin marker data is an albatross, having high TyG means alot of systems in your body are not doing well, and the virus attacks weakness, it(covid-19) is also found to produce extreme clotting so that is probably why people with diabetes/heart disease and hypertension are all at high risk.