342 - What scientists discovered about french fries and diabetes
Science Daily August 11, 2025 Source: BMJ Group
https://www.sciencedaily.com/releases/2025/08/250811104201.htmFrench fries may be more than just a guilty pleasure—they could raise your risk of type 2 diabetes by 20% if eaten three times a week, while the same amount of boiled, baked, or mashed potatoes doesn’t appear to have the same effect.
Eating three servings of French fries a week is associated with a 20% increased risk of developing type 2 diabetes, but eating similar amounts of potatoes cooked in other ways -- boiled, baked or mashed -- does not substantially increase the risk, finds a study published by The BMJ on August 6.
Potatoes contain several nutrients including fiber, vitamin C, and magnesium, but they also have a high starch content and therefore a high glycemic index, so have been linked to a higher risk of developing type 2 diabetes.
But neither the preparation method for potatoes nor specific foods that potatoes would replace have been considered, both of which are key to evaluating the overall health impact of potatoes.
Their findings are based on more than 205,000 health professionals from three large US studies carried out between 1984 and 2021. Participants were free of diabetes, heart disease or cancer and completed detailed food questionnaires every four years.
During almost 40 years of follow up, 22,299 people were diagnosed with type 2 diabetes.
After adjusting for lifestyle and dietary factors related to diabetes risk, the researchers found that for every three weekly servings of total potato, the rate of type 2 diabetes increased by 5% and for every three weekly servings of French fries, the rate increased by 20%. However, similar intake of baked, boiled, or mashed potatoes was not associated with a significantly increased riskReplacing three weekly servings of total potato with whole grains lowered the type 2 diabetes rate by 8%. Substituting baked, boiled, or mashed potatoes with whole grains lowered the rate by 4%, and replacing French fries lowered the rate by 19%.
In contrast, replacing total potatoes or baked, boiled, or mashed potatoes with white rice was associated with an increased risk of type 2 diabetes.