My experience similar to meredithgrey's
Food just wasn't an issue. Preferences were acknowledged but by no means followed up. If you were hungry you ate it and if it was something you really liked, then that was a bonus.
Three meals a day. Small portion sizes. Mostly home-made; my mother was a good plain cook. No snacks. Crisps for birthday parties only. Sweets were kept in tin: two after lunch, and then we cleaned our teeth. Later we could buy sweets from our pocket money - that was a normal amount for the time, but by modern standards not generous. Water or very dilute squash - Rose's Lime Juice was a treat! No fizzy drinks, except for the time when a friend of my mother's gave her a ginger beer plant. Most of the bottles exploded in the larder and made a horrid sticky mess and attracted so many wasps. But my mother had clearly intended a treat for us. That was kind of her. Also Lucozade in its orange cellophane wrapper when genuinely ill in bed. No takeaways, no frozen foods/ready meals.
On Sundays, we had a roast meat/chicken lunch and a proper pudding (apple crumble was a favourite). Supper that evening was always cold; cheese, celery, crackers or oatcakes, very possibly a slice of home-made 'luxury' cake, such as a victoria sandwich or chocolate sponge. Perhaps an orange or an apple to follow.
When junior school age, we had a light 'tea' to eat when we came home - a scone and butter (possibly jam, but I always hated that) or a piece of flapjack or slice of sponge-cake (all home made) or a crumpet with butter and perhaps jam or marmite or some cheese - plus, close to bedtime, a hot milky drink and perhaps a couple of plain biscuits. (Ovaltine, anyone? Rich tea biscuits?)
Breakfast was porridge or toast and marmite or a fairly plain cereal such as Weetabix plus milk. I can remember the excitement when Muesli reached local consciousness.
Lunch - when at junior school - was our main meal. We walked to and fro to school four times a day. It would be something like macaroni cheese or shepherd's pie, followed by stewed fruit or, in winter, a steamed pudding.
At secondary school I took a packed lunch; that was plain by modern standards: a sandwich, usually cheese because that was what I liked, a biscuit such as a 'Club', and an apple. That was all, right until I was 18. I survived. Supper at that age was more substantial: fish pie (my mother's was excellent); sausages or - an amazing new discovery at the butcher's - burgers, and 2 veg and potatoes. Pizza, pasta, curry and other foods from beyond UK shores - even French ones ! - were really not known. This was ignorance, not prejudice.
Tinned or stewed fruit or perhaps yoghurt - also new and exciting - for pudding. I think we forget today how difficult it was in the past to secure reliable year-round supplies of fresh fruit, without a freezer or supermarkets. That's why so many family gardens had blackcurrant or gooseberry bushes or an apple tree or two, or rhubarb beds. Our next-door neighbour - a lovely, wise, gentle person - was a whizz at the old-fashioned an really not at all easy skill of bottling fruit. Looking back, we should have respected her more.