No Carb Foods Can Still Spike Your Blood Sugar: The Complex Role of Protein, Fat, and Gluconeogenesis

This podcast episode challenges the common belief that only carbohydrates raise blood sugar, demonstrating that individuals on zero-carb diets can still experience elevated blood sugar levels. The host explains that this phenomenon is due to gluconeogenesis, a process where the body synthesizes glucose from non-carbohydrate sources, primarily glycerin from fat and amino acids from protein. The episode critiques the widely used Glycemic Index (GI) as "virtually useless" because it only measures carbohydrate-containing foods and often labels foods as "low" when their impact on blood sugar is still significant. While the Insulin Index (II) is acknowledged as a more relevant metric for understanding insulin response, its practical application is hampered by a severe lack of consistent and comprehensive data.

The discussion delves into the nuanced impact of macronutrients on blood sugar and insulin. It highlights that carbohydrates have the most significant effect, protein has a moderate impact, and fat tends to slow down the overall response. A key focus is placed on protein metabolism, explaining that protein's primary role is tissue building. However, any excess protein, or protein that is incomplete in its essential amino acid profile or has imbalanced ratios, will be converted into glucose and used as fuel. The concept of "protein utilization" is introduced, measured by nitrogen retention, which indicates how much ingested protein is successfully incorporated into body tissue versus being excreted or converted to glucose.

Practical insights are provided regarding different protein sources and their utilization rates. A whole egg is presented as an exemplary food, with approximately 48% of its protein being utilized for tissue building. In stark contrast, egg white alone has a much lower utilization rate of about 17%, primarily because the egg yolk contains essential amino acids crucial for the complete utilization of the egg white's protein. Animal meats like beef, fish, and poultry typically show around 32% utilization, while processed proteins such as whey, soy, and other plant-based protein powders generally have a lower utilization rate of about 17%. The host emphasizes the importance of consuming a variety of foods, particularly for vegans and vegetarians, to ensure a complete and balanced intake of essential amino acids.

Broader implications connect these metabolic insights to overall health, extending beyond mere weight management to include the prevention and management of type 2 diabetes and insulin resistance. Understanding the intricate ways in which protein and fat influence blood sugar and insulin allows for more informed dietary choices, moving beyond simplistic carbohydrate counting. The podcast encourages listeners to develop a deeper understanding of the body's physiological mechanisms rather than relying solely on potentially misleading numerical indices, ultimately aiming for a more comprehensive approach to mastering health and well-being.

"Isn't it funny how some people say that you have to eat sugar and carbohydrate in order to generate blood sugar for your brain and yet there are a lot of people who eat zero carbohydrate in their diet and their blood sugar is too high."

"The same mechanisms that drive weight up are also associated with type 2 diabetes, insulin resistance and disease."

"The glycemic index is virtually useless because they only created these values in glycemic index for things that contain carbohydrate."

"The idea of the insulin index is very very good because insulin is really what we're looking for, but there's so little data to go by."

"The lesson is that carbohydrates drive it the most both glycemic and insulin. Protein can drive it somewhat and fat slows it down."

"The main purpose of protein is to become tissue. Ideally that is why we eat protein."

"If you're missing one letter... how many of those words how many of those amino acids can you build and the answer is 0 you cannot spell this word unless you have that letter and what this means then is all of the other amino acid gets turned into glucose."

"One of the best foods in terms of utilization is a whole egg almost half 48% of the protein gets utilized 52% become excreted."

"Egg white only gets used about 17%. Why is that? Because when we look at the composition and we start understanding how the body uses this, egg white is virtually all protein and it has a very high glycemic index of 55."

"What most people don't realize is egg yolk actually has more protein than white."

"83% of the egg white gets turn into glucose and that's why it drives so much insulin."

"Even if you eat something that's supposed to be highly utilized but you eat way way more than the body can you use there's only so much protein that fits into your body's amino acid pool... then any access will be turned into glucose and fuel."