Insulin and potassium have a feedback mechanism, so that if, for example, blood levels of potassium get too high, your body releases insulin from the beta cells to help lower the levels.

There is some indication that people who have metabolic syndrome or type 2 diabetes have a low level of potassium in their cells. (If you access this article online, please ignore the picture of the banana!) The best way to get potassium is to eat avocados!

References

Stöppler, Melissa Conrad, MD; medical editor William C. Shiel, Jr., MD, FACP, FACR. “Hyperkalemia (High Blood Potassium),” MedicineNet (medically reviewed on September 11, 2019). https://www.medicinenet.com/hyperkalemia/article.htm (accessed on 8/2/2020).

Purdie, Jennifer; medically reviewed by Debra Sullivan, PhD, MSN, CNE, COI. “What Is the Connection Between Diabetes and Potassium?” Healthline (updated on March 12, 2020).
https://www.healthline.com/health/diabetes/diabetes-and-potassium (accessed on 8/2/2020).