There's more choice in food now.
I remember not eating stuff because I didn't like it. Now with more choice and better cooking, there's nothing with the exception of lamb/mutton that I won't eat.
I would regularly not eat my school dinners as they were horrible, boiled potatoes, boiled veg, economy sausages and baked beans etc. Stodgy puddings with custard, jam roly poly, blancmange, tapioca, sago, rhubarb, tinned fruit as dessert etc.
When you look at the food of your youth, you probably didn't eat a fair bit of stuff, and the stuff you didn't like is no longer available.
Ready meals didn't exisit, and now there are Chinese, Italian and Indian variations.
The country got fat when the slow shift from salad cream to mayonnaise occurred. Mayonnaise makes bad/dull things taste good.
I remember when not liking garlic was the norm.
When you have an adventurous palate, then portion control becomes the problem.