Metabolism, Energy & Weight

Leptin is your body’s master satiety hormone, but in hypothyroid patients, hypothalamic leptin receptors become unresponsive. Understand why an underactive thyroid creates relentless hunger signals and stalled fat burning.

Brown Adipose Tissue (BAT) relies on active T3 to express Uncoupling Protein 1 (UCP1) inside mitochondria. Discover why low thyroid hormone levels paralyze natural shivering-independent thermogenesis and lock in stubborn visceral fat.

Go past about 16 hours without food and two things happen in the liver. Glycogen stores run low, and leptin — a hormone made by fat cells — drops sharply. Together, those signals tell the liver to favor Type 3 deiodinase, an enzyme that turns T4 into Reverse T3 instead of active T3. Reverse T3 … Read more

Even a mild rise in TSH — between 3.0 and 7.5 mIU/L — can downregulate two liver enzymes, MTHFR and betaine-homocysteine methyltransferase. When that happens, homocysteine builds up in the blood, and the lining of your arteries takes the damage. Key Clinical Takeaways Subclinical hypothyroidism impairs hepatic homocysteine remethylation, which multiplies cardiovascular risk. Homocysteine above … Read more

Exhausted all day but suddenly bursting with energy right when you should sleep? Explore the inverted circadian cortisol curve common in low thyroid states.

Can’t remember names, losing your train of thought, and feeling mentally detached? Explore how low T3 starves neurons of glucose and depletes acetylcholine.

Is 16/8 fasting sabotaging your thyroid? Discover how prolonged caloric deprivation downregulates deiodinase-1 and elevates reverse T3 (rT3).

Do you feel like collapsing into sleep 45 minutes after eating? Learn how cellular T3 deficiency destabilizes glucose transporters and causes reactive insulin surges.

Intermittent fasting (16:8 schedules) has become one of the most popular weight loss trends in the United States. It offers metabolic benefits for insulin resistance, but it can trigger an unintended metabolic brake in women with sensitive thyroid function. The Hepatic Glucose and T3 Connection Converting inactive T4 into active T3 in the liver is … Read more

Millions of Americans now use GLP-1 receptor agonists (semaglutide, tirzepatide) for weight reduction. If you also manage hypothyroidism, you face a dual dilemma: delayed gastric emptying slows medication absorption, while significant weight loss decreases required replacement dosages. Adjusting Replacement Parameters Safely Levothyroxine dosing is calculated based on lean body mass (approximately 1.6 mcg per kilogram). … Read more