Can Diabetics Eat Potatoes?
Summary
Potatoes have a very high glycemic index, making them a poor food choice for diabetics. Dr. Berg argues that keeping carbohydrates extremely low — well below mainstream dietary guidelines — is the most effective approach for managing blood sugar levels and improving long-term diabetic markers.
Key Takeaways
- Potatoes are high glycemic foods and rapidly raise blood sugar, making them unsuitable for diabetics
- A baked potato has a glycemic index between 84–111, far above the high-GI threshold of 70
- Boiled potatoes score 82 and instant potatoes score 97 on the glycemic index — all problematic for blood sugar control
- Dr. Berg recommends diabetics keep daily carbohydrate intake below 20 grams
- The American Diabetes Association recommends 135–230 grams of carbohydrates per day — a range Dr. Berg considers harmful for diabetics
- Low carbohydrate diets are supported by multiple studies for improving both fasting blood sugar and HbA1c levels
- HbA1c reflects average blood sugar over a three-month period and is a key diagnostic marker for diabetes management
Details
Glycemic Index of Potatoes
The glycemic index (GI) measures how quickly a food converts to sugar in the bloodstream. Any food scoring above 70 is considered high glycemic. Potatoes in various forms all exceed this threshold:
| Preparation | Glycemic Index |
|---|---|
| Baked potato | 84–111 |
| Boiled potato | 82 |
| Instant potato | 97 |
Cooking methods appear to influence the exact score, but no standard preparation keeps potatoes within a safe range for diabetics.
Carbohydrate Recommendations
Dr. Berg’s recommended carbohydrate ceiling for diabetics is under 20 grams per day, which aligns with a ketogenic diet approach. This stands in stark contrast to the American Diabetes Association’s guideline of 135–230 grams per day, which Dr. Berg directly attributes to worsening diabetic outcomes.
Supporting Evidence
Multiple studies cited by Dr. Berg indicate that low carbohydrate diets can:
- Lower fasting blood glucose
- Improve HbA1c (a three-month average blood sugar marker)
This positions carbohydrate restriction as a primary dietary intervention for managing type 2 diabetes and insulin resistance.