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Hormones
Dec 10, 20257 min read

The Thyroid Connection: Why You're Fatigued and Gaining Weight

Your thyroid controls your metabolism. Learn how to identify subclinical thyroid dysfunction and support optimal thyroid function naturally.

Dr. Maria Krista A. Pinol

Dr. Maria Krista A. Pinol, MD, RN

Lead Clinical Faculty — AccrediPro University

Medically reviewed by Dr. Maria Krista A. Pinol, MD, RN — Lead Clinical Faculty, AccrediPro University. Last reviewed April 5, 2026.

The Thyroid Connection: Why You're Fatigued and Gaining Weight

Thyroid dysfunction affects millions of women, yet most are told their labs are "normal." Learn why conventional testing misses subclinical hypothyroidism and what you can do about it.

The Missing Piece

Standard TSH testing only tells part of the story. A complete thyroid panel includes Free T4, Free T3, Reverse T3, and thyroid antibodies. Without these markers, subclinical dysfunction goes undetected. Read our companion article on functional vs. conventional lab ranges for context on how to interpret results.

Signs Your Thyroid Needs Support

  • Unexplained fatigue despite adequate sleep
  • Weight gain or inability to lose weight
  • Cold hands and feet
  • Hair loss or thinning
  • Brain fog and memory issues
  • Constipation
  • Depression or low mood

Natural Thyroid Support

Key nutrients for thyroid function include selenium, zinc, iodine, iron, and vitamin D. Addressing inflammation, supporting gut health, and managing stress are equally important for optimal thyroid function. Deepen your clinical skills with our Functional Medicine Certification.

References

  1. Chaker L, et al. Hypothyroidism. Lancet. 2017;390(10101):1550-1562. PubMed
  2. National Institute of Diabetes and Digestive and Kidney Diseases. Hypothyroidism (Underactive Thyroid). NIDDK
  3. Garber JR, et al. Clinical practice guidelines for hypothyroidism in adults. Thyroid. 2012;22(12):1200-1235. PubMed
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Dr. Maria Krista A. Pinol

About the Author

Dr. Maria Krista A. Pinol

MD, RN — Lead Clinical Faculty

Dr. Maria Krista A. Pinol is a physician and registered nurse with over a decade of clinical experience in integrative and functional medicine. She leads AccrediPro University's clinical curriculum, bridging conventional medical training with root-cause therapeutic approaches.

View Faculty Profile →

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