Covid and LC are new, meaning WTF what do we use as analogs. Research science is slow and methodical, organizing the study, collecting enough subjects/samples, analysis, and publication take years. That plus bureaucrats interfering with science are reasons why past advising people on masks/distance/closings/etc. was like tossing a lot of cats into a bag. Science will have answers for covid and long covid (LC), but it will take months and years. I am a research scientist, and got covid March 2023; my LC lasted for 8 months and is almost gone now. I just get some glimmerings of fatigue and don't have as much endurance as before; maybe some of that is turning 70 and having multiple autoimmune diseases. I managed LC by managing stress, sleeping, and exercise in bits followed by rest. I already had a constrained mostly FODMAP diet due to celiac. I've kept a food log for many years and didn't find any correlation between what I ate and how I felt, at least regarding LC. Were someone to have a food intolerance, LC would likely be harder because of a ramped up immune response. Celiac can be asymptomatic or have any of a couple of hundred symptoms when glutened; it is controlled by not eating wheat, rye, or barley. I suspect that LC will be as complex but hopefully more info on how to minimize or end it is in the pipe. Did I mention that research scientists tend to be verbose?