Metabolic Flexibility and How the Lumen device can help with Fasting | Jason Fung

Thanks to Lumen for sponsoring! Go to to get 15% off your Lumen today.

Hi, I'm Dr. Jason Fung. Today, we’re diving into metabolic flexibility – what it is, why it matters, and how you can measure it with a simple handheld device called Lumen. This video is sponsored by Lumen, and you can get a discount with the code below!

Metabolic flexibility is the ability of your body to switch between burning glucose and fat for energy. This is crucial for adapting to different energy needs and maintaining good health. With the Lumen device, you can easily measure your metabolic flexibility at home by tracking the carbon dioxide you exhale.

In this video, we’ll cover:
Metabolic Flexibility – Understand how your body switches between burning carbs and fat.

Lumen Device – Learn how this device measures your respiratory exchange ratio (RER) to determine what fuel your body is using.

Importance of Metabolic Flexibility – Discover why being metabolically flexible is essential for preventing obesity, insulin resistance, and diabetes.

Scientific Studies – Explore research showing how Lumen can help diagnose and improve metabolic flexibility.

Practical Tips – Get advice on using fasting and diet adjustments to enhance your metabolic health.

Whether you're looking to optimize your metabolism or learn more about metabolic health, this video has valuable insights for you. Don’t miss out!

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if you want to try the lumen for yourself, You can get a 15% off code : www.lumen.me/fung

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▶️ Timestamps / Chapters
00:00 Intro
00:30 Metabolic flexibility
01:53 Feeding – Insulin Rises Stores Sugar and Fat
04:23 How much Glucose Burning depends on
07:00 Response to glucose load ( carbohydrates )
07:56 Obesity Facts
08:48 Lumen help fasting
11:00 Outro
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📌 YouTube Medical Lectures (for specialist physicians):
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