French Fries Linked to Higher Type 2 Diabetes Risk

Published in The BMJ, the study analyzed health data from more than 205,000 healthcare professionals in the United States over nearly 40 years. During the study period, more than 22,000 participants were diagnosed with type 2 diabetes, a condition that affects the body’s ability to regulate blood sugar effectively.

According to the findings, consuming three servings of French fries each week was linked to a 20 percent higher risk of developing type 2 diabetes. In contrast, eating potatoes prepared through healthier cooking methods, such as baking or boiling, was not associated with a meaningful increase in diabetes risk.

The researchers also examined the effects of replacing French fries with other foods. Substituting fries with whole grains, including oats, brown rice, and barley, was associated with a 19 percent reduction in diabetes risk. However, replacing potatoes with white rice led to a higher risk, highlighting the importance of choosing healthier alternatives.

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Although potatoes contain starch that is rapidly converted into glucose, they also provide important nutrients, including vitamin C, potassium, magnesium, and dietary fiber. Researchers emphasized that potatoes can still be included in a balanced diet when prepared using healthier cooking methods.

While the study does not prove a direct cause-and-effect relationship between French fries and diabetes, its large sample size and four decades of follow-up provide strong evidence supporting the observed association.

The findings reinforce existing dietary recommendations that encourage greater consumption of whole grains, reduced intake of highly processed foods, and healthier potato preparation methods to support long-term metabolic health.