- US News Health: Pre-Pregnancy Potato Consumption Linked to Gestational Diabetes
- BMJ: Pre-Pregnancy Potato Consumption and Risk of Gestational Diabetes Mellitus: Prospective Cohort Study
The same thing has been shown with regular type 2 diabetes – people eating potatoes more often get that variety of diabetes too.
These, of course, are only statistical correlations, so these studies do not by themselves prove that potatoes cause diabetes. But potatoes certainly contain fast-acting carbs that raise blood sugar. Avoiding those carbs is great for treating type 2 diabetes, so it would not surprise me if it could prevent it as well.