I have always regarded the veg as an essential (diabetes makes no difference to that with anything growing above ground but obviously we have to watch the carbs in those that grow under it and any legumes too) and all fruit as a treat or a pudding. Being older and growing up just post war - that's exactly how it was. Everyone grew some veg - and often some fruit usually blackcurrants, goosegogs or raspberries - and had a row of spuds, clumps of celery and rhubarb plus a row of lettuce, a clump of thyme, parsley, sage and mint. It was barter in any row of houses whenever anyone had a glut of whatever.
It was good if you knew someone with a greenhouse. My sister's friend's dad up the street had one. The friends were in demand every spring to 'prick out' the bedding plant seedlings - deft, slender fingers made a better job - which Mr I used to produce for his own garden and to sell to everyone in the street and down the road - pennies for a dozen of each kind and your borders were full. They were paid - 3 ha'pence each a tray! He kept tally and paid them at the end of the job, a week or 10 days doing an hour each day after school. They loved it, plenty of time to natter. They were both on 6d a week pocket money at the time - so this was the equivalent of a lottery win today! LOL
Fruit however - apples, oranges, pears, the very occasional punnet of strawberries and ditto peach - cost money and though we would always have some sort of it for the weekend - that was it for the week other than what was on the bushes in the garden or otherwise swapped for something else. Oh - and a couple of (bought) Bramleys every weekend for the apple pie or crumble on a Sunday.