Grunger
I'm relieved you paid attention to the '5 A Day' stuff and put it into action. I don't know which country it is, but there is one which encourages '9 A Day'. Even Jigjag, with his access to the finest fruit and veg, could find that hard-going at times.
I think the 'units' refers to alcohol. I don't know how anyone can keep track of all that anyway - working out how many units are in a small glass of wine, a large glass of wine, a beer, a strong beer... maybe drinkers all go around with a calculator to hand?