interesting concept. Instead of scores given on the ride home. (Am I thinking of the same games show?)
BGs taken & errant spikes deducted from the host..
The prize could go to the least in the “red.” Or putting the guests out of range..
But so easily pranked by a “win-at-all-costs” contestant
Maybe different dietary regimes could be represented on the different nights: Eatwell plate one night, vegan another, low carb another, carnivore another... then the experts could try and explain the results the guin... contestants had