One possible reason for it is that there may be a food allergy involved.
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Of course. I have not found the source. But when I fast, whether intermittent or what have you, it does not matter. It will start clearing up. I just eat too much I suppose. Thats what I’ve been leaning on here lately.
You might want to remove one food item at a time, with advice of how to do this from a dietician, to see if there is one food that is causing it.
It could a sugar problem. Not processed sugar, mind you, if your diet is low in processed sugar, but in your total carbs. If your carb count is too high, your body can’t process all your carbs and may just be converting to blood sugar to try and store it somewhere.