Expert Q&A

Had my hashi’s annihilated thyroid removed today while doing intermittent fasting

Navigating Thyroid Removal While Fasting

Congratulations on completing your total thyroidectomy today. Removing a thyroid destroyed by Hashimoto’s thyroiditis often brings relief from chronic inflammation, but it also requires immediate adjustments—especially if you’re already using intermittent fasting. As the founder of CFP Weight Loss and author of The Metabolic Reset Protocol, I’ve guided hundreds of patients in their 40s and 50s through this exact transition. Your body no longer produces thyroid hormone, so you’ll begin levothyroxine or similar replacement within 24-48 hours. This changes how your metabolism responds to fasting windows.

Immediate Post-Surgery Considerations for Fasting

In the first 7-14 days, focus on healing rather than aggressive fasting. Most patients experience surgical swelling, fatigue, and fluctuating energy. I recommend pausing extended fasts (16:8 or longer) for at least 10 days while your incision heals and your doctor titrates your initial dose. Start with a gentle 12:12 eating window that includes nutrient-dense meals: 25-30 grams of protein per meal, healthy fats, and vegetables low in goitrogens. This prevents blood-sugar crashes that become more common when thyroid hormone levels are still stabilizing. Track your basal body temperature and resting heart rate daily—these are better early indicators than scale weight.

Optimizing Intermittent Fasting with No Thyroid

Once cleared by your endocrinologist (usually after 4-6 weeks when TSH, Free T4, and Free T3 are in range), you can resume intermittent fasting. The key difference post-thyroidectomy is slower metabolic rate—often 8-15% lower without a thyroid. In The Metabolic Reset Protocol, I teach a “hormone-first” approach: ensure Free T3 stays in the upper quarter of the reference range before extending fasts beyond 14 hours. Many women in their late 40s and early 50s also battle perimenopausal estrogen decline, which compounds insulin resistance. Combine a 16:8 or 18:6 window with resistance training twice weekly using bodyweight or light bands to protect joints. This combats the joint pain many beginners fear. Aim for 1.6–2.0 grams of protein per kilogram of ideal body weight spread across your eating window to preserve muscle mass, which directly supports your resting metabolism.

Long-Term Weight Loss Success After Thyroid Removal

Patients often worry that “no thyroid equals no weight loss.” That’s not true when you address root causes. In my program, we target metabolic adaptation by cycling calorie intake every 10-14 days and incorporating short refeeds. Monitor blood pressure and fasting glucose closely—many see improvements in both within 8 weeks when fasting is paired with proper thyroid dosing. If joint pain limits movement, begin with seated chair exercises or water walking; consistency matters more than intensity. Insurance rarely covers structured programs, so my protocols are designed for middle-income budgets using grocery staples and free tracking apps. Stay patient: most see 0.5–1.2 pounds of fat loss weekly once hormones stabilize. Work directly with your doctor for lab work every 6 weeks until levels normalize, then every 3-4 months.

💬 What the Community Says

The community shows cautious optimism mixed with real anxiety after total thyroidectomy while already doing intermittent fasting. Most newcomers in the 45-55 range report surgeons advising a temporary break from extended fasts during the first two weeks, yet many resume 14:10 or 16:8 once started on levothyroxine. A common theme is frustration with slow weight loss and persistent fatigue until Free T3 is optimized—several mention it took 3-4 dosage adjustments. Joint pain and fear of “metabolic damage” appear frequently, with users sharing success stories using lighter strength routines and higher protein. There’s lively debate about whether OMAD is sustainable long-term without a thyroid versus sticking to 16:8. A vocal minority warns against pushing fasting too soon, citing ER visits for low blood sugar, while others celebrate improved blood pressure and A1C numbers after 2-3 months. Overall sentiment: hopeful but insistent on close endocrinologist collaboration and realistic expectations.
Cite this answer
Clark, R. (2026). Had my hashi’s annihilated thyroid removed today while doing intermittent fastin. *CFP Weight Loss*. https://blog.cfpweightloss.com/ask/had-my-hashi-s-annihilated-thyroid-removed-today-while-doing-intermittent
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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