You hit your goal weight. Then, hunger crept back in, your energy dropped, and the scale rose. Sound familiar? You're not broken, your body is built for this.

In this episode, Holly and Jim sit down with Dr. Rudy Leibel, one of the most influential obesity researchers in history, a Columbia University scientist whose team cloned the leptin gene and fundamentally changed the world's understanding of obesity. What was once dismissed as a willpower problem, Dr. Leibel helped prove is a deeply biological one. And his groundbreaking work laid the foundation for the very GLP-1 medications making headlines today.

If you've ever felt like your body is working against you, this episode will explain how your body’s biology impacts weight, share practical strategies for managing it, and offer real reasons for optimism about what's coming next.

Discussed on the episode:

The evolutionary reason your body panics the moment you start losing weight
Why the biological drive to regain never truly lets up, and what successful "maintainers" are actually doing differently
The surprising reason metabolic adaptation may not predict who regains weight
What "threshold" vs. "set point" means for your biology and why the distinction matters
Why GLP-1 medications are more like aspirin for a fever than a true fix for the underlying biology
The next frontier in obesity treatment that the pharmaceutical industry hasn't fully tackled yet
What yo-yo dieting on a GLP-1 could mean for your body, and when it becomes a real concern.
The honest answer to: "Do I have to be on semaglutide forever?"
At what age does obesity risk "lock in" for kids, and what should parents actually do about it
Whether there will ever be a single solution to obesity (Dr. Leibel doesn't hold back)
What Dr. Leibel is doing with the next decade of his career, and why it involves growing brain cells in a dish