Having too little thyroid hormone in the blood, even in the low-normal range raises the risk of developing Type 2 diabetes, especially in people with prediabetes, a new study in nearly 8,500 people finds. The study results will be presented Sunday at the Endocrine Society’s 98th annual meeting in Boston.
Prediabetes is a mild elevation in blood glucose, or sugar, level that usually occurs before diabetes develops. One of every 10 people with prediabetes will develop Type 2 diabetes every year, according to the Hormone Health Network.
In the new study, the risk of developing Type 2 diabetes over long-term follow-up increased by 13 percent for people with low thyroid function–often called underactive thyroid gland or hypothyroidism-or even those with low-normal thyroid function. However, the diabetes risk was up to 40 percent higher for individuals with reduced thyroid function if they already had prediabetes, the investigators reported.
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