If you have a very strenuous job with a day's worth of hard manual labour you need carbs and lots of them. Chip butties would be fine.
In the olden days (50+ years ago) when everything was manual, including washing the blankets and beating the rugs, never mind walking everywhere, then carbs were needed and burned up.
Dripping on toast, chip butties, 6 spoons of sugar in your tea. All burned off with physical labour.
In fact you needed carbs to keep warm in the winter, with no heating in the bedrooms and no central heating.
Everything was so much more physical then. No we have gadgets to do all the hard work, and have to use gadgets for exercise. It's quite funny really.
Times have changed, our diets need to change.