348: The Science of Metabolic Flexibility
Get Leaner & Live Longer
Nate Palmer
4.9 • 300 Ratings
🗓️ 2 June 2026
⏱️ 37 minutes
🧾️ Download transcript
Summary
Have you ever wondered how to enjoy your favorite carbohydrates without completely ruining your fat-loss progress or crashing your energy levels halfway through the day?
This episode compiles previous interviews regarding how to fuel the body, burn fat, and use carbohydrates. Rachel Gregory shares her transition from keto to reintroducing carbohydrates to fuel training and performance. Robert Sikes explains how adherence to keto develops metabolic machinery. I share my framework on carb back-loading to manage glycogen stores. Consuming carbohydrates post-workout and at dinner keeps blood sugar from spiking, maintains fat adaptation, and shifts the body into a rest state. Keeping carbohydrates under 100 grams lets you utilize fat for energy during the day and use carbohydrates for recovery.
Key takeaways
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Metabolic flexibility allows your body to burn fat for energy during low-impact activities and seamlessly switch to burning carbohydrates during workouts.
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Becoming fat-adapted typically requires a minimum of three to four weeks in a low-carbohydrate state.
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Reintroducing carbohydrates should be done slowly, prioritizing sources like potatoes, rice, and fruits over processed foods.
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Carb back-loading involves eating your carbohydrates post-workout and at dinner to replenish muscle glycogen without storing it as fat.
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Consuming carbohydrates in the evening helps transition the nervous system into a parasympathetic, rest-and-digest state for sleep.
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Strict adherence to a single dietary protocol like keto can maximize the efficiency of your body's metabolic machinery.
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A low-carbohydrate lifestyle can be defined as consuming under 100 grams of carbohydrates per day.
Resources
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Website: https://milliondollarbodylabs.com/
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Book: The Million Dollar Body Method by Nate Palmer
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Lean Energy Stack: https://milliondollarbodylabs.com/pages/lean
Instagram: @_milliondollarbody
Transcript
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| 0:00.0 | Today, we're diving in deep to a topic that I think gets tossed around a lot, but is not |
| 0:04.6 | very well understood that I'm incredibly passionate about, the science of metabolic flexibility. |
| 0:09.6 | This episode is a compilation of some of the best moments from our previously published |
| 0:12.3 | interviews bringing together different perspectives on how to fuel your body, burn fat, |
| 0:16.0 | and use carbohydrates to your advantage without losing your progress. |
| 0:19.9 | You're going to hear from a couple of amazing guests. First up is Rachel Gregory. Revisit her conversation about her personal journey |
| 0:24.6 | transitioning from a strict keto diet to becoming metabolically flexible. She breaks down why she was |
| 0:29.7 | initially carbphobic and how she learned to strategically reintroduce carbs to improve her training |
| 0:34.5 | and performance, all while keeping her body able to seamlessly switch back and forth between fasting and fat-burning modes. Then we bring on Robert Sykes, |
| 0:42.0 | the keto savage, for a slightly different tip. Robert and I get into a discussion about this |
| 0:46.3 | value of strict adherence to a ketogenic diet to really maximize and build up your body's |
| 0:50.1 | metabolic machinery. He shares his thoughts on whether it's better to be a master of one |
| 0:54.4 | dietary protocol or a jack of all trades with metabolic flexibility. And we dig into the science |
| 0:58.8 | of ketones versus glucose as a cleaner burning fuel source for the body. Between their interviews, |
| 1:04.4 | I'll also be dropping into shares in my own frameworks on carb backloading and how to manage |
| 1:08.3 | your glycogen storage so you can have great energy all day long without those massive blood sugar spikes. I call this glycogen priming or the million dollar body method. I'm just going to lay it out for you here. So you get a few different perspectives and start seeing what works for you and what works for your body. You're listening to get leaner and live longer. My name is Nate Palmer. Let's do this. If you're going from a really low carb or keto lifestyle, it's also going to result in inflammation in your body. |
| 1:31.3 | So you're not going to feel that good. Your joints are going to hurt. It's just overall negative. But if you can be a little bit smart about this, take a little bit of a longer term perspective. you can get to the point where you're now a little bit more metabolically flexible, |
| 1:43.0 | which means that your body can stay fat adapted and burn fat, which is amazing, |
| 1:47.3 | but it can also burn carbs when you call upon it. And especially if you've gone low carb, if you've done the low carb reset, if you've done some sort of keto diet, you want to be able to reward yourself for the effort you put in. Most people in the U.S. are sugar burners. We're burning carbs all day long because |
| 2:01.3 | that's what they eat. They eat a lot of sugar. Their body doesn't even barely know how to burn fat. It has no reason to. Now that you've gone through a keto or low carb phase, now you're more fat adapted, which is awesome, so powerful. But I think it can be even more powerful if you can burn fat as well as being able to burn the occasional carb. |
| 2:19.3 | I think that's a even more powerful if you can burn fat as well as being able to burn the occasional |
| 2:18.8 | carb. I think that's a great place to land and to live long term. Now, some of you might be like, |
... |
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