I currently have three possible competing theories to explain 'VLC icy fingers'. Either it's an electrolyte imbalance (helped by the potassium in the banana), or it's not enough carbs (helped by the carbs) or it's not enough calories (helped by the carbs....). I guess in some ways this is a little like the 'metabolic advantage'. Maybe it exists, and maybe it doesn't, but if eating a low carb diet works for you, does the mechanism matter that much?
Like, who cares what the freaking cavemen ate? But if mimicing their diet brings someone to eschew frankenfoods, isn't that still a win?
However, I have noticed that on days when I didn't 'carb load' the night before, I can definitely notice that my hands go cold somewhere between 3pm and 4pm. That's my trigger to break out the bananas for dessert that night