If you're getting ice cream at the grocery store, take a look at the packaging. You'll notice that most say “Frozen Dairy Dessert” and not ice cream.
Apparently, this is because the quality no longer meets FDA requirements for what is considered ice cream, which requires at least 10% dairy milk fat and must weigh at least 4.5 pounds (2.04 kg) per gallon.
Today's "ice cream" often contains skim milk and contains more air as the manufacturers air-whip to increase the volume.
They usually add more sugar to make them taste delicious.
It's remarkable how things gradually change for the worse over time, and we rarely notice.