Understanding the Dawn Phenomenon: High Fasting Blood Sugar on Keto & Intermittent Fasting Explained

The podcast episode delves into the "dawn phenomenon," explaining why blood sugar naturally rises in the morning due to a nocturnal surge of counter-regulatory hormones like cortisol, glucagon, adrenaline, and human growth hormone. It clarifies that this is a normal physiological response in everyone, but its manifestation can be more pronounced in individuals with insulin resistance. The core argument is that while high fasting blood sugar can be a concern, its interpretation differs significantly for those on ketogenic or intermittent fasting diets compared to those with traditional high-carb diets or Type 1 diabetes.

A crucial distinction is made between the dawn phenomenon and the Somogyi effect. The Somogyi effect, characterized by a large glucose spike after an overnight hypoglycemic dip, is specific to Type 1 diabetics who cannot produce their own insulin. In contrast, the dawn phenomenon is a universal, natural hormonal preparation for waking. The episode also highlights the difference in how the body handles a small, hormonally induced glucose rise (e.g., 1-2 grams) versus a massive carbohydrate load from a typical breakfast (e.g., 120 grams), emphasizing the body's intelligent, adaptive response to different metabolic states.

For individuals on low-carb, keto, or intermittent fasting diets who observe stubborn fasting blood sugar around 120 mg/dL, the podcast suggests this is often a positive sign, indicating improved insulin sensitivity and a body that is no longer in an "alarm state." The advice is to not panic over these numbers, as the body is simply not producing excessive insulin for a small, non-threatening glucose increase. Instead of focusing solely on glucose levels, the recommendation is to monitor broader markers of metabolic health like A1C, weight loss, and HOMA-IR, which reflect long-term insulin sensitivity.

The episode critiques the conventional focus on lowering blood sugar with drugs like metformin and insulin, arguing that these treatments often perpetuate rather than solve the underlying problem of insulin resistance. It advocates for a holistic understanding of metabolic health, where the goal is to achieve insulin sensitivity and cellular balance, rather than merely suppressing glucose numbers. This perspective encourages listeners to look beyond superficial metrics and understand the intelligent mechanisms of their body, especially when adopting dietary changes like keto and IF.

"Dawn phenomenon also known as the dawn effect is when your blood sugar rises in the morning but why does it do that and what's the mechanism"

"in the normal person this rises a few points it's not a strange thing it happens it's supposed to happen it happens in every one in the world"

"if your insulin resistant now whenever you have a cortisol response and whenever you have any blood glucose increase whether it's from a hormonal effect or whether it's because you ate something your cells are resistant so you tend to have greater blood sugar responses"

"Somogyi is a type 1 diabetes thing and the dawn effect is something that happens to everybody people"

"a hundred milligrams of blood sugar for the per deciliter for the average person is only five grams it is a flat little teaspoon of sugar that's all the sugar that you have in your system"

"this cortisol put one half a gram of sugar into your blood you didn't eat anything yet there is no load of food or carbohydrate in your system your liver just made a half a gram of sugar and it put it directly into the bloodstream"

"your body says hey no big deal I'm chilling I I have this totally under control if if it goes high or if you eat something I'll do something about it but this is not a big deal I'm backing off on the insulin because there's nothing really here to process all that happened was you added one to two grams of sugar"

"the only treatment for insulin resistance and diabetes are drugs to lower blood sugar but that's not the problem"

"that stubborn blood sugar around 120 is a good thing that means you're doing the right thing your body is not in an alarm state it's chilling it doesn't have to work so hard"

"what you're after is the long term insulin resistance you want to become insulin sensitive meaning that the cell gets into a place of balance where it starts wanting some food instead of being force-fed all the time"