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From W.HYY in Philadelphia, this is Fresh Air Weekend. I'm Tanya Mosley. Today, nutrition policy

expert Marion Nessel. Decades of studying the food industry have given her, as she puts it,

a clear-eyed view of what we're up against every time we walk into a grocery store.

The purpose of a supermarket is to sell as much food as possible to as many people as possible,

as often as possible, at as higher prices they can get away with.

I can't say that enough.

Also, we hear from science writer Mary Roach.

Her latest book, Replaceable You, is about replacing human body parts, thanks to promising

research and breakthroughs.

She tells us about organs transplant it from pigs and attempts to replace bald spots on the

scalp with hair from other parts of our bodies.

And she admits, if you're squeamish, she can sometimes be unpleasant to be around.

So sometimes I can't sort of share my appreciation for all these gooey bits and pieces of us that

are performing miracles on a daily basis. And Justin Chang reviews the new film Hamnet. That's coming up on Fresh Air Weekend.

This is Fresh Air Weekend. I'm Tanya Mosley. My first guest is Marion Nessel, a molecular

biologist turned nutritionist and food policy scholar whose voices helped decode for decades

what we eat and why it matters. Her well-known

...