Feeding a cold and starving a fever is a falsity. Starving yourself while ill will only further weaken you. The term was stave, meaning to prevent. Though there are hundreds of other foolish and illogical "remedies" passed on for decades if not hundreds of years, let me just say that if it sounds odd, irrational, or just plain crazy, then it probably is. Use your common sense. Take your vitamins. Down that cough syrup and acetaminophen when needed. Talk to your doctor. Coincidence can be very deceiving at times, leading us to believe in ideas that are inaccurate.
All this being said, I must say that the vinegar and mouthwash bath for callused feet does indeed work. Granted I acknowledge the possibility that soaking ones' feet in any liquid for 20-30 minutes is liable to make any amount of dead skin more eager to slough off. For all I know water and dish soap might be just as effective. I shall try it on my husband's ever peeling feet and see.