Do not find potatoes, cabbage, onion, bread (assume the cheapest white type), marrowbeans, marge, tea and a few eggs sounds very healthy to me.
No fruit or fresh veg or salad, only milk in tea providing calcium, iron just from those souffles - Not sure how long that would be very oursihing. YUes, coul manage for a week or two, but that would be all.
I used to manage quite happily on about a fiver a day- (just me) providing me with three good meals- porridge for brekkie, eggs, baked beans, or sardines on toast at lunch time, and then salad with chicken or a piece of fish and a yoghurt for evening meal. Sadly, that was pre-pandemic. I used to boast that my two slices of good bread toasted, with two poached eggs and half a tin of low sugar, etc baked beans cost me under 50p. Not any longer though!!!!
I dread to think how difficult it must be for families now.