[Barrin92]

i mean it does sound kind of jerk-ish because it's not like telling someone who is obese right now to eat better is going to drastically reduce his pandemic risks in a week.

I'm generally sceptical of tying this kind of advice to crises anyway. It's a social and long-term issue. We ought to eat better not just so that we are better prepared for a pandemic but because it's the right thing to do in general.