The Fat Loss Hormone: New Science on Leptin + a 7-Day Leptin Reset Protocol
Optimal Protein Podcast with Vanessa Spina
Vanessa Spina
4.6 • 795 Ratings
🗓️ 23 January 2026
⏱️ 46 minutes
🧾️ Download transcript
Summary
Skip to the start of the recap: 13:41
In today's Friday solo episode of The Optimal Protein Podcast, Vanessa breaks down the science of leptin — the hormone that determines whether your body will burn fat or protect it.
Leptin isn't just about appetite. It's a metabolic permission signal, and when leptin signaling is disrupted, fat loss can stall even in a calorie deficit.
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Vanessa explains how sleep, circadian rhythm, and light exposure affect leptin, why dieting can feel harder than it should, and walks you through a practical 7-Day Leptin Reset Protocol designed to reduce hunger, improve satiety, and make fat loss feel easier.
This episode connects leptin science with protein-forward nutrition, calories in vs. calories out, resistance training, and circadian alignment for sustainable fat loss.
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🎙 The content in this podcast is for informational purposes only and not nutritional or medical advice. Always consult your healthcare provider before making major dietary or lifestyle changes.
Transcript
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| 0:00.0 | Welcome to the Optimal Protein podcast. I'm Vanessa Spina. Hello, my friends. Welcome back to the podcast. I'm your host |
| 0:09.0 | Vanessa and I am super excited for today's episode because today we're talking about a more recently |
| 0:15.8 | discovered hormone that it turns out is one of the biggest regulators of fat loss. |
| 0:23.3 | And it's also a reason for fat loss resistance or stalling, stubborn hunger, and |
| 0:30.3 | metabolic resistance. |
| 0:32.1 | And that hormone is leptin. |
| 0:34.4 | So today's episode is going to be partly a recap of my conversation with Dr. |
| 0:41.9 | Catherine Clinton, where we talked about leptin and hormones and some of the circadian connection |
| 0:47.8 | to leptin and also doing a deep dive into leptin and fat loss because it is an absolutely fascinating hormone, |
| 0:56.8 | like I said, more recently discovered in terms of scientific history. And we're going to talk |
| 1:04.7 | all about what leptin actually does, why leptin resistance can make fat loss feel impossible, how sleep and circadian |
| 1:14.2 | disruption interfere with leptin, and how to improve leptin signaling. We even have a seven-day |
| 1:22.0 | leptin checklist at the end of the episode. So we're going to do an in-depth deep dive on leptin in |
| 1:29.5 | today's episode. I'm also going to connect it back to my interview with Dr. Catherine |
| 1:34.2 | Clinton and recap some of the top highlights and insights from that episode. And we're |
| 1:39.9 | going to talk about light exposure, circadian rhythm, red and infrared light, and the other |
| 1:45.6 | environmental levers that we discuss that are powerful influences on our physiology, |
| 1:52.3 | but always through the lens of fat loss physiology. So I can't wait to get into today's episode. |
| 1:59.1 | We're going to jump right in after this quick break. |
| 2:03.1 | Friends, if you've been curious about red light therapy or you've seen me or other people |
| 2:07.8 | using red light therapy panels, I want to take a moment to share why I love these devices so much |
| 2:13.8 | and why the science behind them is so compelling. So red light therapy is one of the most |
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