The standard version for a lot of foods has got bigger.
Cupcake - 70s version, tiny cake dusted with icing sugar or thin layer of icing, 2026 - muffin size cake with several inches of buttercream style icing
Restaurant starter - 70s, glass of fruit juice, slice of melon, cocktail glass portion of prawns. 2026 - heap of chicken wings, plate of nachos.
Burger - 70s, one burger, not in a bun by default, served with something like beans and a small portion of oven chips. 2026 - two burgers in thick brioche with bacon, cheese, sauces etc.
Takeaway coffee - 70s, small polystyrene cup of coffee with optionally milk or sugar. 2026 - large cup with options of whipped cream, syrup, chocolate etc.
Cookie - 70s, about an inch diameter out of a packet of biscuits. 2026 - at least 4 inches diameter, sold with cakes in supermarket.
'Shrinkflation' and the sugar tax have reduced the sizes of some items, e.g. Mars Bars, but 50 years ago you were probably more likely to have something like a Club or Penguin than a Mars Bar anyway.