Back in the early 80s some bright spark in the system decreed that IOT cadets could no longer take Mars bars to camp. That meant staff could not either. People started to lose weight and feel odd, so someone - a nutritionist or some such like measured the work rate at camps 1 and 2. Long time ago but I seem to reacall the reqirement that generated was an astonishing 7000 calories a day, against a ration (enhanced) of about 3500 or 4000 calories a day. The ban on Mars bars was lifted! (I cannot eat a Mars bar other than when sailing, but even I was eating 2 or 3 of them a day!)