Cited by 149Thyroid Disorders and TreatmentsGenetics, Aging, and Longevity in Model OrganismsDietary Effects on Health

Effect of Long-Term Calorie Restriction With Adequate Protein and Micronutrients on Thyroid Hormones

Fontana, Luigi, Klein, Samuel, Holloszy, John O., Premachandra, Bhartur N.·2006·The Journal of Clinical Endocrinology & Metabolism

Abstract

CONTEXT: Caloric restriction (CR) retards aging in mammals. It has been hypothesized that a reduction in T(3) hormone may increase life span by conserving energy and reducing free-radical production. OBJECTIVE: The objective of the study was to assess the relationship between long-term CR with adequate protein and micronutrient intake on thyroid function in healthy lean weight-stable adult men and women. DESIGN, SETTING, AND PARTICIPANTS: In this study, serum thyroid hormones were evaluated in 28 men and women (mean age, 52 +/- 12 yr) consuming a CR diet for 3-15 yr (6 +/- 3 yr), 28 age- and sex-matched sedentary (WD), and 28 body fat-matched exercising (EX) subjects who were eating Western diets. MAIN OUTCOME MEASURES: Serum total and free T(4), total and free T(3), reverse T(3), and TSH concentrations were the main outcome measures. RESULTS: Energy intake was lower in the CR group (1779 +/- 355 kcal/d) than the WD (2433 +/- 502 kcal/d) and EX (2811 +/- 711 kcal/d) groups (P < 0.001). Serum T(3) concentration was lower in the CR group than the WD and EX groups (73.6 +/- 22 vs. 91.0 +/- 13 vs. 94.3 +/- 17 ng/dl, respectively) (P < or = 0.001), whereas serum total and free T(4), reverse T(3), and TSH concentrations were similar among groups. CONCLUSIONS: Long-term CR with adequate protein and micronutrient intake in lean and weight-stable healthy humans is associated with a sustained reduction in serum T(3) concentration, similar to that found in CR rodents and monkeys. This effect is likely due to CR itself, rather than to a decrease in body fat mass, and could be involved in slowing the rate of aging.

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Crossref · 10.1210/jc.2006-0328

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Authors
Fontana, L., Klein, S., Holloszy, J. O., & Premachandra, B. N.
Affiliations
  • Washington University in St. Louis (US)
  • Thyroid Specialty Laboratory (B.N.P.), St. Louis, Missouri 63125
Corresponding author
Fontana, Luigi
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
2006-08-01
Volume
91
Issue
8
Pages
3232-3235
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W2071480387
Cited by
149
References
20
Citations by year
2026: 1 · 2025: 5 · 2024: 5 · 2023: 5 · 2022: 4 · 2021: 6 · 2020: 6 · 2019: 7 · 2018: 7 · 2017: 7 · 2016: 5 · 2015: 5 · 2014: 8 · 2013: 12 · 2012: 6
FWCI
7.40
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • Institutional Research Information System (Università degli Studi di Brescia) (submittedVersion)
Funders
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 56351, DK20579, R01DK037948, P30DK056341)
  • National Center for Research Resources (M01RR000036)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Health Sciences › Medicine › Physiology › Dietary Effects on Health
Keywords
caloric restriction, thyroid hormones, triiodothyronine, free thyroxine, reverse T3, thyroid-stimulating hormone, protein intake, micronutrient intake, aging, energy intake, fat mass, Western diet, physical activity
MeSH terms
Adult, Body Composition, Dietary Proteins, Female, Humans, Male, Middle Aged, Nutritional Physiological Phenomena, Thyroid Hormones, Thyrotropin, Thyroxine, Triiodothyronine, Triiodothyronine, Reverse, Tumor Necrosis Factor-alpha, Exercise, Body Mass Index, Micronutrients, Caloric Restriction

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