"The rates of fractures are highest in the high milk drinking countries, basically North America, Scandinavia, Denmark, and they're lowest in countries that actually don't consume milk at all."

Today, we're joined by one of the most influential and widely cited figures in nutrition science. Dr. Walter Willett, Professor of Epidemiology and Nutrition at the Harvard T.H. Chan School of Public Health, has published over 2,000 papers across four decades. His work includes some of the largest and most rigorous studies on diet and chronic disease ever conducted.

He is the author of several books, including the bestselling Eat, Drink, and Be Healthy, which challenged prevailing nutrition dogma and offered a clearer, evidence-based path forward.

In this conversation, we examine the eating patterns most closely linked to longevity—for both human health and the health of the planet—the rise of foods designed for convenience rather than nourishment, and the risks they pose. We also break down the practical steps that offer the greatest protection against illness.

So tune in for the rare opportunity to hear from a scientist and physician whose work continues to define the boundaries of nutrition.

What we discuss:

The potential risks of dairy consumption during adolescence in relation to bone health.
Dairy-free sources of calcium and how to meet needs without milk.
Concerns with current dietary guidelines and how they may mislead the public.
Why plant protein sources are preferable to animal sources.
The Planetary Health Diet and what it emphasizes.
How diet influences susceptibility to infectious diseases, especially in children.
The types of processed foods most harmful to health.
The primary drivers of the obesity epidemic.
Practical tips for eating healthier with limited access to fresh foods.
Key principles to follow when navigating conflicting nutrition advice.