Fat Burning Power of Fasting: 12 Hours, 24 Hours and 48 Hours Explained
Dr. Jockers Functional Nutrition
Dr. Jockers
4.8 • 688 Ratings
🗓️ 11 September 2025
⏱️ 22 minutes
🧾️ Download transcript
Summary
In this episode, Dr. Jockers breaks down exactly what happens inside your body during a 12, 24, and 48-hour fast. You’ll discover how these fasting windows affect fat burning, metabolism, and even your brain’s performance. The science behind it will show you why fasting is far more powerful than just skipping meals.
You’ll also learn how fasting lowers insulin, boosts growth hormone, and increases ketones—helping your body preserve muscle while burning fat. These shifts not only fuel your energy but also enhance mental clarity, creativity, and focus. The longer the fast, the deeper the benefits for your body and brain.
Beyond fat burning, fasting activates cellular repair processes like autophagy and stem cell production. These changes promote gut health, reduce inflammation, and support anti-aging at a deep level. By understanding these stages, you’ll be able to create a fasting routine that works best for your unique health goals.
In This Episode:
00:00 Introduction to Intermittent Fasting
03:20 The Science of Fasting: 12 to 14 Hours
08:40 The Science of Fasting: 16 Hours
14:03 The Science of Fasting: 20 to 24 Hours
17:43 The Science of Fasting: 3 to 5 Days
18:43 Fasting Strategies and Recommendations
20:39 Conclusion and Final Thoughts
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“Fasting isn’t just about skipping meals; it's a lifestyle that activates fat burning, boosts brain health, and reduces inflammation.”
~ Dr. Jockers
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Transcript
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| 0:00.0 | Most people that I know that practice intermittent fasting will say they do their best work, |
| 0:05.1 | they're most creative, and they're most sharpest, the most cognitively sharp when they're in a |
| 0:11.0 | fasted state, fasting for 16, 18 hours, or sometimes even more if they're very metabolically |
| 0:16.9 | healthy. Why are they so creative? Why are they so mentally sharp? Because the ketones are |
| 0:22.0 | elevating during that period of time. Well, today's episode is on the fat burning power of fasting. |
| 0:27.4 | I'm going to break down. What does it look like for a 12-hour fast, 24-hour, 48 hours? What's |
| 0:32.9 | actually happening in your body when you're undergoing these types of fast. I'm going to break all of that |
| 0:38.9 | down in this episode. You guys are really in for a treat here. If you know anybody that's interested |
| 0:43.7 | in intermittent fasting or maybe a skeptic of intermittent fasting, this is a great episode to send |
| 0:49.4 | them. Of course, leave us a five-star review on Apple iTunes, wherever you listen to this podcast. |
| 0:56.1 | And check out Dr.jokers.com. |
| 0:58.1 | If you want any natural health information, let's say you're curious about Hashimoto's |
| 1:03.2 | thyroiditis or you're interested in information about thyroid health or about psoriasis |
| 1:09.6 | or stomach acid levels. |
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| 1:22.6 | So be sure to go there. |
| 1:23.9 | Thank you so much for being a part of our podcast community here. |
| 1:28.5 | And let's go into this episode on the fat burning power of fasting. I want to take a moment and talk about something that |
| 1:34.1 | affects over half the population. Menopause, whether you're going through it, approaching it, |
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