who only by moving can balance

My Mum told me that when she was a child during WW2 and the period of extreme rationing immediately afterwards she and her friends were encouraged to pick red and black currants to be dried and used in baking (as well as to make cordials that were recommended nationally as a source of Vitamin C for growing children). And how glad they were when proper (dried grape) currants became available.
So the American usage is effectively a FamineFood