thyroid

How Menstrual Cycle TSH Fluctuations May Drive Metabolic Rate Shifts in Women

Recent studies suggest luteal‑phase TSH rises could lower resting metabolic rate. We outline the underlying mechanism and a simple 10‑day self‑experiment to test the link.

gut-microbiome

How Gut Bacteria‑Derived Secondary Bile Acids May Tune Thyroid Signaling via the Hypothalamus

A new hypothesis links gut‑derived secondary bile acids to hypothalamic TSH receptor expression, offering a 10‑day self‑experiment to test the connection.