Type 2 diabetes remains one of the most widespread metabolic disorders globally, affecting hundreds of millions of people. While conventional treatments focus on medication adjustments and glucose management, a radical shift has taken place in modern diabetes care: dietary strategy as a primary therapeutic tool for remission. One of the most influential voices promoting this approach is Dr. Jason Fung, a nephrologist and bestselling author known for his work on metabolic diseases and fasting therapies.
In Part 2 of The Diabetes Code Clinic, Dr. Fung explains why low-carbohydrate diets, when applied correctly, have the power to lower blood glucose, reduce insulin resistance, and ultimately help many patients achieve diabetes remission. The uploaded video provides deep insight into this approach, and this article expands that content with additional scientific context, updated evidence, and professional recommendations.
This comprehensive guide explores the science behind carbohydrate restriction, practical meal strategies, remission outcomes, and research-backed benefits—combined into a structured, SEO-optimized resource suitable for both laypersons and professional readers.
Understanding Type 2 Diabetes as a “Glucose Overflow” Disease
Dr. Fung famously describes type 2 diabetes as an overflow problem, not simply a disease of high blood sugar. According to him, the body—particularly the liver and muscles—becomes overloaded with glucose, causing excess sugar to spill into the bloodstream.
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This metaphor of a rain barrel helps illustrate the underlying pathophysiology:
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The “barrel” represents the body’s storage capacity.
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Dietary carbohydrates continually fill the barrel.
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When capacity is exceeded, glucose overflows into the blood.
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The result: chronic hyperglycemia and a diagnosis of type 2 diabetes.
This explanation mirrors what is well-documented in metabolic research:
Insulin resistance occurs when cells are overloaded with energy substrates, particularly glucose and fatty acids.
Ref:
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DeFronzo RA. “Pathogenesis of Type 2 Diabetes Mellitus.” Med Clin North Am. 2004.
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Petersen KF et al. “Impaired mitochondrial activity in insulin-resistant offspring.” NEJM. 2004.
Thus, solving diabetes requires addressing the root cause: too much stored glucose.
Why Carbohydrates Play the Largest Role in Blood Sugar Elevation
According to Dr. Fung, carbohydrates are the primary macronutrient that raises blood glucose. Proteins and fats do not have the same impact.
The Three Macronutrients: How They Affect Blood Glucose
| Macronutrient | Components | Raises Blood Glucose? | Notes |
|---|---|---|---|
| Carbohydrates | Glucose, starch, sugar | Yes (significantly) | No essential carbohydrates exist. |
| Proteins | Amino acids | Minimal → converted slowly | Essential for muscle, hormones, enzymes. |
| Fats | Fatty acids | No | Includes essential omega-3 fatty acids. |
Dr. Fung emphasizes:
“There are no essential carbohydrates. Carbohydrates are glucose. When you eat them, your blood glucose goes up.”
This is consistent with clinical nutrition data showing that:
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High-carbohydrate foods produce rapid blood glucose spikes.
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Low-carbohydrate diets reduce post-meal glucose and insulin requirements.
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Carbohydrate restriction effectively improves glycemic control.
Ref:
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Feinman RD et al. “Dietary carbohydrate restriction as the first approach in diabetes management.” Nutrition. 2015.
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Hallberg SJ et al. “Reversing Type 2 Diabetes with a Low-Carbohydrate Diet.” JMIR Diabetes. 2018.
Scientific Evidence Supporting Low-Carbohydrate Diets for Diabetes Remission
One of the strongest clinical outcomes referenced in the video is from Dr. David Unwin in the UK.
His results:
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46% of type 2 diabetes patients achieved remission.
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93% of prediabetes patients returned to normal blood sugar levels.
These findings align with broader scientific literature:
Major Studies Showing Diabetes Remission Through Low-Carb Diets
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Virta Health 2-Year Clinical Trial
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54% diabetes reversal at 2 years.
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Significant HbA1c reductions, medication discontinuation.
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Keto and Low-Carb Interventions
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Demonstrated improvements in weight, glycemic markers, triglycerides, and fatty liver disease.
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Meta-Analyses
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Low-carb diets outperform low-fat diets in glycemic control and weight loss.
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Ref:
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Athinarayanan SJ et al. Front Endocrinol. 2019.
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Snorgaard O et al. BMJ Open Diabetes Res Care. 2017.
Foods to Eat on a Low-Carbohydrate Diet (According to Dr. Fung)
Dr. Fung provides a straightforward list of foods to prioritize.
1. Green and Non-Starchy Vegetables
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Broccoli
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Asparagus
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Cauliflower
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Artichokes
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Spinach
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Zucchini
These vegetables are:
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Very low in carbohydrates
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High in fiber
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Rich in micronutrients
2. Protein Sources
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Beef
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Poultry
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Eggs
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Fish
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Shellfish
Proteins do not raise blood glucose significantly.
3. Natural Fats
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Olive oil
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Butter
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Avocados
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Coconut oil
These provide energy without glucose spikes.
Foods to Avoid (for Blood Sugar Control)
Dr. Fung warns strongly against foods that rapidly increase glucose.
1. Added Sugars
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Sweetened drinks
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Coffee drinks
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Cocktails
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Fruit juices
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Iced teas
2. Starchy Carbohydrates
These quickly break down into glucose:
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White rice
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Potatoes
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Bread
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Pasta
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Flour-based foods
Dr. Fung illustrates that a bowl of rice equates to 10 teaspoons of sugar, and a potato roughly 9 teaspoons.
3. Fat-Free Processed Foods
Often loaded with sugar to compensate for taste.
4. Snacks Made from Refined Carbohydrates
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Crackers
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Cookies
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Biscuits
5. High-Sugar Fruits
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Mangoes
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Grapes
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Bananas
Lower-sugar fruits such as berries, apples, and pears are preferred.
Why Low-Carb Nutrition Helps Reverse Type 2 Diabetes
1. Low-Carb Eating Reduces Insulin Levels
Insulin is the primary hormone responsible for fat storage.
A high-carb diet = chronically elevated insulin.
A low-carb diet = reduced insulin → reduced fat storage → improved insulin sensitivity.
