I'm Carla Zeus.

Today we're taking a look inside the U.

S.

Food supply, this time zeroing in on produce.

We're examining how engineering and importing have replaced old fashioned growing in the U.

S.

Food industry and how consumer demand still has the power to influence the industry.

Our reporter, Cristina Alesci, has gone inside some of America's biggest food companies, seeing what most folks haven't seen before and getting incredible insight as to how production affects what's on our plate salad.

Americans are eating up to five times more leafy greens than they did 20 years ago were consuming £3 billion a year.

What are intensifying love affair with fresh produce is creating problems for farmers, for the environment and even for our own health.