The Health Pulse

Episode 140 | Where Does Morning Glucose Come From on Keto?

Quick Lab Mobile Episode 140

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0:00 | 23:15

Here are the episode description and companion blog embed intro. I’d keep the distinction between physiological glucose sparing and pathological insulin resistance central to this one.

🎙️ The Health Pulse – Episode Title:

Why Is My Fasting Glucose High on Keto? The Dawn Phenomenon Explained

Episode Description:

Your CGM stays nearly flat all day. You're eating very few carbohydrates. You're producing ketones. Then you wake up and your fasting glucose is unexpectedly high. Where did that glucose come from?

In this episode of The Health Pulse, we explore the physiology behind elevated morning glucose on a ketogenic or very-low-carbohydrate diet and explain why a higher fasting glucose doesn't automatically mean your diet has stopped working—or that you've developed diabetes.

We begin with the dawn phenomenon. Sleep isn't metabolically inactive. As morning approaches, your circadian system coordinates changes in hormones including cortisol, growth hormone, glucagon, and catecholamines, signaling the liver to increase glucose availability in preparation for waking. That glucose doesn't have to come from last night's carbohydrates.

Even during nutritional ketosis, the body maintains some circulating glucose. Through gluconeogenesis, the liver can produce it from substrates including glycerol, lactate, and glucogenic amino acids. We explain why this process is highly regulated and why the popular claim that “too much protein just turns into sugar” oversimplifies the physiology.

Then we tackle the more complicated question: when is elevated fasting glucose a normal adaptation, and when should it raise concern?

During prolonged carbohydrate restriction, skeletal muscle can reduce its reliance on glucose and preferentially use fatty acids, helping preserve glucose for tissues with greater glucose requirements—a phenomenon often described as adaptive glucose sparing. We examine this concept alongside controlled research showing that ketogenic diets can alter glucose tolerance, highlighting why a single glucose reading cannot tell you whether the underlying physiology is healthy or pathological.

The metabolic context matters. We discuss how fasting insulin, HbA1c, triglycerides, ketones, HOMA-IR, and C-peptide, together with CGM patterns and clinical context, can help distinguish compensatory hyperinsulinemia and metabolic dysfunction from a low-insulin, carbohydrate-restricted state.

We also explain why morning glucose needs a clean baseline. Poor sleep, sleep apnea, psychological stress, late-night meals, intense evening exercise, caffeine, illness, and normal day-to-day hormonal variation can all influence what appears on your meter the next morning.

The takeaway is simple: don't diagnose your metabolism from one fasting glucose value. A morning glucose reading is one frame of a much larger metabolic movie.

If you're following keto, low-carb, or using a CGM to understand your metabolism, this episode will help you interpret that mysterious morning rise with physiology instead of fear.

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Disclaimer: The information provided in this podcast is for informational purposes only and should not be considered medical advice. The content discussed is based on research, expert insights, and reputable sources, but it does not replace professional medical consultation, diagnosis, or treatment. We strive to present accurate and up-to-date information, medical research is constantly evolving. Listeners should always verify details with trusted health organizations, before making any health-related decisions. If you are experiencing a medical emergency, such as severe pain, difficulty breathing, or other urgent symptoms, call your local emergency services immediately. By listening to this podcast, you acknowledge that The Health Pulse and its creators are not responsible for any actions taken based on the content of this episode. Your health and well-being should always be guided by the advice of qualified medical professionals.

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