Subject: Re: Covid experts, who only quote other experts,
Why did Covid hit America so hard? We are diabetic, obese, and several other chronic illnesses

Yup. One of the best defenses against any upper respiratory illness is a high VO2 Max, which is a great indicator of cardio vascular health.

For those who constantly demand sources here’s one of many:

https://pmc.ncbi.nlm.nih.gov/a...