Doctor in the House S04E19 - Shut Up and Eat What You're Given

Considering the food in the hospital canteen to be inedible, Duncan and Paul go on a macrobiotic diet, but Professor Loftus is appalled to find they have scurvy, due to a lack of vitamin C, and makes them eat in the canteen. To bring him on side they get him to eat the canteen food and he agrees that it is dreadful. However the new menu he orders proves to be so expensive that the old fare is served up again.