Good that you’ve found some success. Unfortunately, I lose weight rapidly if I fast, even for short periods. So I wouldn’t be able to do it often enough to make a difference.
Well, I know that many measures (especially that I recommend) may seem counterintuitive. Ie. they seem to make your worse not better. But the whole point of this exercise is to find what is actually causing all these problems.
So, I'd just ask this question: why do you lose weight rapidly?
Is it because you have metabolic imbalance and catabolism takes over during fasting? I had that too, until I started taking aminoacid supplement.
Or maybe you are hyperthyroid?
In any case, people are often unaware that fasting is a normal physiological state, and for example fasting for one day then eating another 3 days, then fasting for one day is completely normal (more normal for the body than eating all the time). And if it's normal then specific mechanism must have developed that take advantage of this fasting state. And they did - as many papers, theories and practical observations show.
Of course you may start by skipping only one meal every 3 days. Or 2 days. I don't even call this intermittent fasting though it is one.
I’ve had extensive testing for gluten/celiac etc, all negative, but gave it up just because it’s supposed to be bad.
All of these tests are often crappy. I am sensitive for sure (probably to some proteins in the bran so it's something different than celiac but still it makes me terribly miserable).
But I need the calories and seem to tolerate it, gained a couple pounds, and feel somewhat better.
Potatoes? I eat only potatoes, it's my staple food.
But of course bread is the most convenient food.
I also have a couple of really good digestive supplements with glutamine, but make me worse if I take them.
What minerals did you find deficient?
Whoa, all of them. All of minerals, vitamins, nutrients. But most of the time these didn't work when taken, just the opposite. It's hard to nail a specific one that helped the most or was most deficient.
Usually, after many many attempts I found that something worked. Last thing that works for me is selenium. Just took it about 2 weeks ago. But it didn't work for me at all for all these years. Why, oh why? Because now I supplemented with all the necessary aminoacids incl. glycine and NAC. These boosted glutathione and now selenium works. But of course I used to take glycine and NAC. But I was protein deficient. So any protein that I took was taken elsewhere where it was needed more. You can't expect glycine and NAC to be taken to muscles and turned into glutathione if your guts, heart and brain need it more. And these get preferential treatment, unfortunately or maybe fortunately.
What else...
Zinc, copper, omega-3, choline, vitamin D, carnitine, b1... and many more...