That's just someone's idea or comment, it's not a something demonstrated in a medical study. The thread title makes it sound like new medical research.
In a quick Google search, I could not find much to suggest that fasting reduces LPS. I did find some papers that caloric restriction decreased the ill effects of LPS, but that's perhaps to be expected, as fasting is anti-inflammatory.
Well for me fasting is impossible at the moment despite eating a high fat, very low carb diet. Each morning when I wake up I am very weak until my adrenal/thyroid meds kick in which takes a couple of hours.
My blood sugar is fairly low after not eating anything substantial for about 13 hours and I will usually have a bad head developing. I cannot wait to eat something like coconut oil with a good natural peanut butter and maybe a couple of pecans plus a cup of tea. Invariably I have to take some sort of painkiller to stop the head pain going into a migraine.
I really wish I could try fasting for longer but its just out of the question for me unless I wanted to spend the day on the couch which I very definitely don't want to do! One of the reasons that I keep trying to get into ketosis was to see if it would help improve my gut which is of very low diversity and I also have SIBO plus chronic migraine.
One positive is that the SIBO is improving but that also could be due to the Mutaflor I am taking. Nothing is simple or straightforward with this illness!!
I cannot handle fasting. I tried it once in my 20s. I was OK then. It did me no harm. Second time I tried it I got the most horrendous belly ache. From then on I realised it doesn't suit me. I have a low BMI and always had and need food to keep myself going. Can't do fasting.
Even less nowadays. Some of my worst days a few months back, I could hardly eat and felt awful, though I was taking fluids. As soon as I could eat again I felt a great benefit and some strength return.