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Your Body is Burning Carbs, NOT Fat Cells (here’s how to tell)

2025-11-12 People & Blogs
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Thomas DeLauer
Thomas DeLauer
4.0m subscribers

Decode Your Metabolism: Knowing When You Burn Fat Versus Carbs

Discover the physiological signals that instantly reveal whether your body is utilizing fat or carbohydrates for fuel. Mastering these indicators helps you optimize daily energy and workout performance.

Short Summary

  • You can feel—or observe—when your body shifts from fat oxidation to carbohydrate oxidation, typically signaled by increased breathlessness.
  • Carbohydrate consumption drastically prioritizes glucose use, as insulin directly inhibits fat release via hormone-sensitive lipases.
  • Stress is a powerful metabolic switcher, rapidly inducing cortisol release that triggers glycogen use over fat burning.
  • Optimal fat burning correlates with better network stability in the brain, offering improved fluid intelligence and processing speed.
  • The crossover point, where fat use declines and carb use accelerates, often occurs between 55% and 75% of maximum exertion.

This overview explains the science of substrate utilization, focusing on the two major determinants: energy demand and oxygen availability. Learn the specific physiological signs—from breathing patterns to mental clarity—that indicate whether you are tapping into stored fats or readily available carbohydrates for immediate energy needs.

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Description

Thanks to Lumen for sponsoring! Go to http://lumen.me/delauer to get 10% off today! This video does contain a paid partnership with a brand that helps to support this channel. It is because of brands like this that we are able to provide the content that we do for free. Click HERE to Subscribe: https://www.youtube.com/c/ThomasDeLauerOfficial?sub_confirmation=1 Please check out the new Shorts channel, DeLauer Clips and Workouts, here: https://www.youtube.com/channel/UCQPQImPsw74KhO0Zy2-leyA/videos Please Subscribe to my Email Newsletter Here: https://www.thomasdelauer.com/life-optimization-tactics/ Follow More of My Daily Life on Instagram: http://www.Instagram.com/ThomasDeLauer References https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2022.854451/full https://www.sciencedirect.com/science/article/abs/pii/S0149763418309175 https://www.ncbi.nlm.nih.gov/books/NBK209038/ https://pubmed.ncbi.nlm.nih.gov/33270511/ https://pmc.ncbi.nlm.nih.gov/articles/PMC10665514/ Timestamps ⏱ 0:00 - Intro 0:47 - What Determines if the Body uses Fats or Carbs? 1:42 - How to Know Whether Your Body is Using Fats or Carbs 5:20 - Lumen 6:46 - Carbs & Energy Levels 8:46 - Stress & Carbs - How to Know You're NOT Burning Fat 10:20 - How to Know When You're Burning Fat

Top Comments (10)

@Sparrow141420 2025-11-13

Trying to lose a lot of weight, and I'm already down about 45-50lbs. Trying to maintain my metabolism and encourage fat burning as much as I can. Your videos have helped!

18 3 replies
@trixinety 2025-11-12

Thanks for the vid as always, see you tomorrow

7
@WowzaGuy 2025-11-13

This was a pretty interesting video. I’m pondering what we do with this info. That would make an interesting follow up video.

7
@electronaut6240 2025-11-13

Here for the Tomtent.

3
@jaysphere7519 2025-11-13

Here for TDL rhythm

2
@soulcostume6756 2025-11-13

Appreciate the next level of nuance and explanatory 🙌🏼

2
@naikjoy 2025-11-13

8:35 "you'd have to be eating carbs constantly" ... this reminds me of videos of the norsman thriatlnon

1
@virenroopchund2922 2025-11-13

Mah man - here's my comment for the algorithm. Love the content

1
@PhilippKirscht 2025-11-13

Just writing at least seven words for the algorithm :) . Thank you for your content. It helps a lot

1
@joeunger4862 2025-11-13

Here for the algorithm. Thank you, Thomas!

1

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