That’s a tough one. There was some evidence that long fasts can negatively affect the immune system, so when covid came along, many stopped doing long term fasts. I never looked into the actual evidence for that, though. And I don’t know what the time frame was, as short fasts supposedly help the immune system. Or at least that’s what I remember, though I’m not sure to benefit the immune system, you have to “damage” it initially.
I think if you’re feeling OK, it’s probably fine to keep fasting. But I’m a wimp, and if I get a cold, I don’t fast.
By the way, how do you know it’s not covid? I got what I thought was a cold, had symptoms, took a rapid covid test. That was negative, so I didn’t take more tests. I gave blood a few weeks later, and had very high antibody levels. So, I had covid.
Other people we know had the same thing – they had symptoms but the initial test was negative. They kept testing, though, and got a positive.