For some reason, a good chunk of people with long COVID find that minimizing added sugar helps with fatigue, sometimes a great deal. Honestly, it's been kind of magical for me, though it's not without difficulties or problems.
If you want to try, I'd recommend starting by cutting out very rich sources of added sugar (candy, soda, really sweet pastries) and trying to include more vegetables, fruit, and beans in your diet. Lentils are fantastic for this.
I don't know how people figured it out, but I imagine it went something like this:
- Long COVID patient goes to a naturopath because allopathic medicine really doesn't have much to offer in the treatment department
- Naturopath recommends a no-added-sugar or low-added-sugar diet, probably because some naturopaths are H.A.M. on refined sugar = evil or free sugar = evil
- It actually helps, hallelujah!
- Researcher hears about it
- Researcher runs small-ish study
- It really, really works!
I got the article recommended to me, and wowza, my physical capacity increased almost immediately! Don't get me wrong, I'm still disabled, but I was suddenly somewhat less disabled.
HUGE caveats:
1. This won't work for everyone because almost nothing does.
2. You can do yourself some serious harm by going overboard with this
Why do I say harm?
Well, I tried to travel using only a carry-on around Thanksgiving, and I triggered a huge crash. I'd already been hurting because the Venn diagram overlap between very little added sugar, easy to prepare or no prep needed, appealing to me, and with reasonable macros is...small.
My hunger reflex is kind of poor, especially since grad school, which means that if I don't eat when I get hungry, the sensation of hunger just disappears for a while. I usually get another cue or two before I'm getting vertiginous or about to vomit, but it's not guaranteed. (This is why I have phone alarms reminding me to eat.) However, since I didn't have many options that I was able to prepare/appealed in the moment, I just didn't eat much.
In any case, I wasn't recovering from the crash. After six weeks, we figured out that lack of nutrition was an issue and certainly contributing to my problems if not solely causing them. By that point I'd lost 10 pounds of mostly muscle, and I went from having a pretty cute butt to having a long back. Not what I was going for.
Why was I unintentionally starving myself? Because the low added sugar thing had worked so well, I'd started down the path that ends at orthorexia; in the process, I did harm to my body. It's not just medications that come with side effects, it turns out! I don't know how much of this damage I'm going to be able to repair, either.
So, that's why I recommend not going wild with avoiding added sugar, because that's damn hard in most of the world, particularly the US. Take the easy wins of minimizing/eliminating sweets and make the best choices you can.
Note: best choices include choosing the higher-added-sugar option because it's otherwise a better choice for you, because macros, affordability, or it just tasting good.