GLOSSARY TERM

Hashimoto’s Thyroiditis

Hashimoto’s Thyroiditis is a chronic autoimmune disorder in which the immune system mistakenly attacks the thyroid gland, leading to inflammation and a gradual decline in thyroid hormone production. This condition is the most common cause of hypothyroidism in developed nations. Because thyroid hormones (T3 and T4) are the primary regulators of the body's basal metabolic rate, a deficiency in these hormones leads to a significant slowing of metabolic processes, often resulting in weight gain, fatigue, and cold intolerance.

From a metabolic perspective, Hashimoto’s presents a unique challenge as it creates a 'metabolic brake' that can make traditional weight loss efforts ineffective. Management often requires a multi-pronged approach that includes thyroid hormone replacement therapy, as well as dietary interventions designed to reduce systemic inflammation and support immune modulation. Addressing gut health and removing inflammatory triggers like lectins and gluten are often central to improving thyroid vitality and metabolic function in these individuals.

📄 Cite This Definition
Clark, R. (2026). Hashimoto’s Thyroiditis. In *CFP Weight Loss glossary*. https://glossary.cfpweightloss.com/hashimoto-s-thyroiditis
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Russell Clark, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

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