I wouldn't even try to explain the theory at an above GCSE level, but practical experience shows:
One bratwurst, six pints of lager, one of gluhwein and part of a bottle of whiskey lead to a *****y cold night once the stupor wears off at three AM. The resulting hangover is dulled by pain killers and a pint of tea, but service station sandwiches and biscuits do little to keep you warm and result in an inability to ride more than 50 miles at a time.
Pork knuckle, red cabbage with apple, mashed spud, three pints of lager, one schnapps, half a packet of jaffa cakes and a pint of hot chocolate results in waking up when the alarm clock goes and only been sleepy because you are so warm. A pint of green tea and a tin of beans and sausages starts the day warm and only requires a warm drink and a handful of biscuits every hundred and fifty miles to keep going until lunchtime.
Andy