I had to boil potatoes today and the kids said that they'd prefer them peeled first.
So I weighed out the regulation 8 oz per person (275 grams in new money) and peeled them as carefully and gently as possible using an authentic German swivel blade peeler.
Just for the fun of it I weighed the peeled potatoes. To my surprise/horror, I'd lost a quarter by weight.
On the off chance that I'd messed up the original weighing, I then weighed the peelings as well and it all added up nicely.
So maybe they were right, back in the day:
Those who have the will to win,
Cook potatoes in their skin,
Knowing that the sight of peelings,
Deeply hurts Lord Woolton's feelings.