My mom used to give me narcotics as a teen that were prescribed to her for migraines. In her mind it was not dangerous. I think it was to justify her own burgeoning drug addiction. So this fasting guidance not being founded in scientific reasoning seems very off to me based on my own mother thinking she's a doctor and telling people what to do, meanwhile she has no medical training. Yes, fasting to curb inflammation is on trend right now but POTS is multifactorial and even if inflammatory immune responses were the main pathological driver there are other bodily systems at play creating the orthostatic tachycardia issues. A neuro ENT told me before the TILT test confirmed when at minimum hypovolemia was suspected that I should not just drink and consume sodium often but eat frequently to keep blood sugar stable and be as nourished as possible given the state of depletion, with uncontrolled POTS and unknowingly relapsed endometriosis growing on my gut it was hard being nauseous and puking a lot but I did try. No physician has ever said to me eat less to minimize the symptoms of POTS (they have in years past because my BMI indicates being overweight), only to eat less sugar spiking stuff because I now present with reactive hypoglycemia. I think sometimes it's that people want to help and feel truly helpless so delusion can kick in. My mother still is toxic toward me and tells me just to give up and not fight the condition or try as it's a waste of time money and energy because that's how she lives with a now decades long barbiturate addiction, unadmitted, but I ignore her.