I thought it was the other way around, intermittent fasting is eating during the 8 hour window than fast for 16

during a complete 0 calorie fast, I don't think it would help the symptoms directly, but being anti-inflammatory and with studies showing fasting increases HGH
and In animals has shown growth of new nerve cells

"It also increases levels of a brain hormone called brain-derived neurotrophic factor (BDNF) a deficiency of which has been implicated in depression and various other brain problems"


I can say for sure that have a 36 hour fast of 0 calories just water, mentally you feel awesome,

as to affects with PCS, TBI, in theory it makes sense to me that it would help, all though I probably would not attempt a fast directly after an injury, all though if you have been dealing with issues for a while, I think it might be worth it to try a fast to see if it you gain any benefits, but the benefits would only be noticeable after the fast....your first fast will be a mental challenge