Michael, I’m pretty sure you’re right that bad food and lack of exercise are making matters worse with covid, and all sorts of other poor health.
But people should avoid covid anyway, and avoid transmitting it. We’ve still had less than two years to discover its effects; what if it triggers cancer or something, ten years after infection? Maybe it’ll do that especially in people who had it when they were kids, heaven forbid, but biology is complicated so we’re not going to find out for years. It’s particularly worrying that the virus exploits our cells’ ACE2 receptors because so many different tissue types express them.
I’m very wary of the “it mostly kills those who were already old, ill or unfit” message because it spreads complacency – and to make matters worse, complacency seems to be exactly what the UK government wants. Yes, we know it often kills the old and the ill, but we won’t know for a long time yet what it might be doing to the young and healthy.