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Related Concept Videos

Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
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Synthesis and Regulation of Thyroid Hormones01:20

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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The...
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The Thyroid Gland01:23

The Thyroid Gland

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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...
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Hormones and Bone Tissue01:17

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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
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Major Hormones and Their Functions01:27

Major Hormones and Their Functions

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Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and...
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Target Cell Response to Hormones01:22

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Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...
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Updated: Jul 21, 2025

Using a Combination of Indirect Calorimetry, Infrared Thermography, and Blood Glucose Levels to Measure Brown Adipose Tissue Thermogenesis in Humans
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Relationship between caffeine intake and thyroid function: results from NHANES 2007-2012.

Jiaping Zheng1, Xinyan Zhu2, Guiqing Xu1

  • 1Department of Rehabilitation Medicine, School of Health, Fujian Medical University, Fuzhou, China.

Nutrition Journal
|July 25, 2023
PubMed
Summary

Moderate caffeine intake shows a complex relationship with thyroid function, particularly in individuals with metabolic disorders. While low intake may increase thyroid stimulating hormone (TSH), moderate consumption is linked to lower TSH levels.

Keywords:
CaffeineMetabolismNHANESThyroid

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Area of Science:

  • Endocrinology
  • Nutritional Science
  • Metabolic Health

Background:

  • Caffeine intake is linked to reduced metabolic disorder risk and mortality.
  • Thyroid hormones are crucial for metabolic homeostasis.
  • The relationship between caffeine and thyroid function is under-explored.

Purpose of the Study:

  • To investigate the association between caffeine consumption and thyroid function.
  • To explore potential nonlinear correlations.

Main Methods:

  • Utilized data from the National Health and Nutrition Examination Survey (NHANES) 2007-2012.
  • Employed two-step cluster analysis to define subgroups based on metabolic features.
  • Applied restrictive cubic spline and multivariable linear regression analyses.

Main Results:

  • Identified three distinct metabolic subgroups among 2,582 participants.
  • Observed a nonlinear relationship between caffeine intake and serum thyroid stimulating hormone (TSH) in the most metabolically unhealthy group.
  • Moderate caffeine intake (9.97–264.97 mg/d) was negatively associated with serum TSH levels after adjustments.

Conclusions:

  • Caffeine consumption exhibits a nonlinear association with serum TSH in individuals with metabolic disorders.
  • Moderate caffeine intake demonstrates a protective association with thyroid function, potentially influencing metabolic health.