How are FT3 and Blutzucker related?

The relationship between FT3 (free triiodothyronine) and blood glucose (Blutzucker) is well-established in physiology, but not directly addressed in the provided context. Thyroid hormones, particularly FT3, increase basal metabolic rate and influence glucose homeostasis through several mechanisms: they enhance hepatic glucose production, promote glucose uptake in peripheral tissues, and modulate insulin sensitivity. An imbalance—such as in hyperthyroidism with elevated FT3—can lead to impaired glucose tolerance or even hyperglycemia. Conversely, hypothyroidism with low FT3 may improve insulin sensitivity but slow overall metabolism. The evidence for these effects comes from clinical studies and physiological models, not from the given context sources. Therefore, the evidence grade is 'mechanistic'. Caveat: a single FT3 measurement without context (TSH, fT4, fasting glucose, HbA1c) is insufficient for diagnosis. If abnormalities are suspected, consult an endocrinologist.