Six Technologies That Could Shake the Food World

Printed meals, edible bar codes and facial-recognition technology for cows are among the innovations transforming the food industry

A machine that prints chicken nuggets. Fake shrimp made out of algae. Edible coverings that keep fruit fresh.

These inventions—and many more—are part of a technological revolution that is poised to shake up the way we eat.

The food industry has been taking heat from consumers and critics who are demanding healthier ingredients, transparency...