My eye color changes, always has - various shades of grey/blue and green.... obviously i don't notice it happen but I have lost track of the number of times I have been interrupted in the middle of a sentence by someone exclaiming "Holy **** your eyes just changed color!!!" - as this happens mid sentence I don't attribute it to what I am wearing (which does influence the predominant shade) - I can only assume that there are a LOT of micro muscles at play changing the skin/muscles around my eyes, pupil dilation, maybe even factors like eye wetness/redness which shift and alter the perception of the color for try as I might I can't find a way for pigmentation itself to be influenced by mental state....
Blood pressure and diabetes are far easier to explain as blood pressure can be learned to be controlled deliberately to a degree anyhow, ad insulin responses in the body can occur just from anticipating sweet foods - so these things are already tied into the mind body loop....
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