How and why has food changed from 1950 to today's?

Answer 1

This would be practically an infinite list but to start:
Drinks with non-nutritive sweetners such as saccharine and Aspartame even though saccharine was being patented in 1950.
Potato chips made from dehydrated potatoes such as Pringles were not introduced until the early 1970's.
Because of distribution there are foods that were only available to local areas during the 1950's.
Ultra High Temperature Pasteurized milk came into being in the 1960's.

Answer 2

While it has become more artificial and less natural, food has become more conveniently accessible since the 1950's. The food industry has found more efficient ways of packaging and storing food products with the use of preservatives and modern packaging techniques.

Answer 3

tuna noodle casserole came out so did backed Alaska