Click here to read the full article. Dr. Kellman discusses how an under-active thyroid and a “low normal” thyroid puts people at an increased risk of developing type 2 diabetes. Unfortunately, this news isn’t a surprise. All too often, Kellman meet patients being treated for a low thyroid as well as many who are undiagnosed or bypassed by routine testing. They go on to develop disease states like type 2 diabetes, heart disease and a whole host of chronic health conditions. A low thyroid can drastically alter the normal function of every system of the body.