Never worried.

I've treated every kind of virus and inflammation and infection,and rattlesnake bite, as well as cancer and diabetes the same way: when you feel it coming on, rest, drink plenty of water, and fast. You get relief from symptoms within a day, complete relief or disappearance of symptoms usually within three days, and I would often fast for about a week if my illness was serious.

Longer fasts, of weeks are even better, but you will need someone to bring you water and help you to the toilet.

Jesus needed to be tended by angels after his fast.

But fasting even a long time won't kill anyone.

I wish I could speak with the authority of a doctor, but all I can tell you is how well it worked for a poor man, with a poor diet, who labored sometimes too hard, and used fasting many times to treat things that most people go to doctors to treat.

If medicine isn't available, what do you have to lose by trying it?

It is better and much more restful than panicking.