Puberty much earlier if low vitamin D

Note: Vitamin D levels have been crashing in the past 40 years AND the age of puberty have also been dropping around the world

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Early puberty 2X more likely if low vitamin D – Meta-analysis Feb 2020

The Association Between Vitamin D Levels and Precocious Puberty: A Meta-Analysis
J Pediatr Endocrinol Metab, 2020 Feb 18, DOI: 10.1515/jpem-2019-0388
Shanshan Liu 1, Xun Zhu 1, Yuanxin Wang 1, Shoumeng Yan 2, Dong Li 3, Weiwei Cui 4

The objective of this short communication was the relationship between vitamin D and precocious puberty (PP). In this study, a comprehensive search of multiple databases was performed to identify studies focused on the association between vitamin D deficiency and PP. Studies that compared serum vitamin D levels between patients with PP and controls were selected for the systematic meta-analysis. The main outcome was the mean difference in serum vitamin D levels between PP and controls. Vitamin D-deficient subjects were more likely to develop PP. Our findings suggest that PP may be linked to vitamin D deficiency. Thus, providing supplements of vitamin D to PP patients may improve their nutritional status and prevent diseases. But, the amount of vitamin D required is uncertain, so it is important to be careful when taking vitamin D supplements.
 Download the PDF from Sci-Hub via Vitamin D Life

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Early puberty more likely if < 20 ng of Vitamin D - Aug 2018

Vitamin D status and premature adrenarche
Pediatrics International Volume 60, Issue 10, https://doi.org/10.1111/ped.13682
Onur Akın Aysun Bideci Esra Döğer Emine Demet Akbaş Aylin Kilinç Uğurlu Süleyman Tolga Yavuz Şehri Elbeğ Orhun Çamurdan Peyami Cinaz

Background: Vitamin D, an important factor in calcium‐phosphate homeostasis, has recently been suggested to play an important role in the pathogenesis of numerous chronic conditions such as hyperandrogenism. The aim of this study was to investigate the relationship between vitamin D status and premature adrenarche (PA).

Methods
A total of 71 girls with PA and 52 healthy girls, as the control group, were recruited. Axillary and/or pubic hair development before the age of 8 years was defined as PA. Bone age and anthropometric measures including height, weight, and body mass index (BMI) were obtained. 25‐Hydroxyvitamin D (25(OH)D), fasting plasma glucose and insulin were measured. Vitamin D insufficiency was defined as <20 ng/mL.

Results
The PA patients had older bone age, higher BMI standard deviation score, homeostasis model of assessment–insulin resistance (HOMA‐IR), and androgen but lower 25(OH)D than the control group. HOMA‐IR and dehydroepiandrosterone sulfate were also higher in PA patients with vitamin D insufficiency compared with those with normal vitamin D. There was a negative correlation between 25(OH)D and HOMA‐IR.

Conclusion:Low vitamin D is associated with PA; and insulin resistance may be a factor in this association.

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Vitamin D deficiency and age at menarche: a prospective study - Oct 2011

Am J Clin Nutr. 2011 Oct;94(4):1020-5. Epub 2011 Aug 10.
Villamor E, Marin C, Mora-Plazas M, Baylin A.
Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, MI 48109, USA. villamor at umich.edu

BACKGROUND: Early menarche is a risk factor for cardiometabolic disease and cancer. Latitude, which influences sun exposure, is inversely related to age at menarche.
This association might be related to vitamin D, but to our knowledge it has not been investigated in prospective epidemiologic studies.

OBJECTIVE: We studied the association between vitamin D status and the occurrence of menarche in a prospective study in girls from Bogota, Colombia.

DESIGN: We measured plasma 25-hydroxyvitamin D [25(OH)D] concentrations in a random sample of 242 girls (mean ± SD age: 8.8 ± 1.6 y) and followed them for a median of 30 mo. Girls were asked periodically about the occurrence and date of menarche. Baseline 25(OH)D concentrations were categorized as <50 nmol/L (deficient), ?50 and <75 nmol/L, or ?75 nmol/L (sufficient). The incidence of menarche was compared between groups by using time-to-event analyses.

RESULTS: A total of 57% of girls in the vitamin D-deficient group reached menarche during follow-up compared with 23% of girls in the vitamin D-sufficient group (P-trend = 0.0004). The estimated mean (±SE) ages at menarche in the same groups were 11.8 ± 0.2 y and 12.6 ± 0.2 y, respectively (P = 0.0009). After adjustment for baseline age and BMI-for-age z score in a Cox proportional hazards model, the probability of menarche was twice as high in vitamin D-deficient girls than in girls who were vitamin D-sufficient (HR: 2.05; 95% CI: 1.03, 4.07; P = 0.04). Similar results were obtained in girls aged ?9 y at baseline (HR: 2.39; 95% CI: 1.14, 5.00; P = 0.02).

CONCLUSION: Vitamin D deficiency is associated with earlier menarche.

PMID: 21831989

Approximately 1 year earlier if low level of vitamin D
Figure from PDF

Menarche vs life expectancy

PDF is attached at the bottom of this page

3 minute Video by the author

• Elsewhere: In 1901, menarche in US and Canada 13.9 or 14 years.
• By the 1970's it had declined to 12.5 years
• Now, if vitamin D deficient, it is, on average < 12 years

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Early puberty increasing in obese and dark skin children (probably lower vitamin D) – Nov 2013

There was no mention of vitamin D in the article
Black girls had the earliest average onset at 8.8 years old, followed by Latino girls (9.3 years) and white and Asian girls (9.7 years).
The onset for white girls was earlier by four months than in a large study 15 years prior.
The new study found that 14 percent of instances of early puberty appeared linked to obesity,

Onset of Breast Development in a Longitudinal Cohort
Pediatrics (doi: 10.1542/peds.2012-3773) Nov 4, 2013

BACKGROUND AND OBJECTIVES: There is growing evidence of pubertal maturation occurring at earlier ages, with many studies based on cross-sectional observations. This study examined age at onset of breast development (thelarche), and the impact of BMI and race/ethnicity, in the 3 puberty study sites of the Breast Cancer and the Environment Research Program, a prospective cohort of >1200 girls.

METHODS: Girls, 6 to 8 years at enrollment, were followed longitudinally at regular intervals from 2004 to 2011 in 3 geographic areas: the San Francisco Bay Area, Greater Cincinnati, and New York City. Sexual maturity assessment using Tanner staging was conducted by using standardized observation and palpation methods by trained and certified staff. Kaplan-Meier analyses were used to describe age at onset of breast maturation by covariates.

RESULTS: The age at onset of breast stage 2 varied by race/ethnicity, BMI at baseline, and site. Median age at onset of breast stage 2 was 8.8, 9.3, 9.7, and 9.7 years for African American, Hispanic, white non-Hispanic, and Asian participants, respectively. Girls with greater BMI reached breast stage 2 at younger ages. Age-specific and standardized prevalence of breast maturation was contrasted to observations in 2 large cross-sectional studies conducted 10 to 20 years earlier (Pediatric Research in Office Settings and National Health and Nutrition Examination Survey III) and found to have occurred earlier among white, non-Hispanic, but not African American girls.

CONCLUSIONS: We observed the onset of thelarche at younger ages than previously documented, with important differences associated with race/ethnicity and BMI, confirming and extending patterns seen previously. These findings are consistent with temporal changes in BMI.

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3X more likely to be vitamin D deficient if early puberty - June 2014

Associations between serum vitamin D levels and precocious puberty in girls,
Ann Pediatr Endocrinol Metab. 2014 Jun;19(2):91-5. doi: 10.6065/apem.2014.19.2.91. Epub 2014 Jun 30.
Lee HS, Kim YJ, Shim YS, Jeong HR, Kwon E, Hwang JS.
Department of Pediatrics, Ajou University Hospital, Ajou University School of Medicine, Suwon, Korea.

PURPOSE: Vitamin D deficiency has been linked to chronic diseases, such as diabetes mellitus, obesity and autoimmune disease.
However, data on the vitamin D status and its association with precocious puberty in girls are limited.
We aimed to investigate the association between serum 25-hydroxyvitamin D (25OHD) and precocious puberty in girls.

METHODS: A total of 60 girls with central precocious puberty (CPP) and 30 control girls were enrolled. Anthropometric measurement and serum level of 25OHD were estimated for all subjects.

RESULTS: There was a significant difference in the mean serum 25OHD concentration between the precocious puberty group and the control group (17.1±4.5 ng/mL vs. 21.2±5.0 ng/mL, P<0.05). Forty-two of the 60 girls with CPP (70%) had vitamin D deficiency (defined as serum 25OHD<20 ng/mL) and 18 (30%) had vitamin D insufficiency. Of the 30 girls in the control group, vitamin D deficiency was seen in 13 subjects (43.3%), 15 subjects (50%) had vitamin D insufficiency, and 2 subjects (6.7%) had sufficient serum vitamin D (defined as serum 25OHD>30 ng/mL). Vitamin D deficient girls had a significantly higher odds ratio (OR, 3.05; 95% CI, 1.22-7.57, P=0.021).

CONCLUSION: These results showed that vitamin D levels may be associated with precocious puberty.
Further studies are required to establish the potential effect of vitamin D status on puberty.

Summary by Vitamin D Life

	precocious puberty	Control
Vitamin D	17 ng	21 ng
Vitamin D Deficiency < 20 ng	70%	43%
Vitamin D Insufficiency 20-30 ng	30%	50%
Vitamin D Sufficiency ? 30 ng	0%	6.7%

 Download the PDF from Vitamin D Life

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See also Vitamin D Life

• Vitamin D deficiency and pregnancy - from preconception to birth Aug 2010
• Early puberty in girls 60 percent more likely if less than 32 ng of vitamin D – Aug 2017
• International Variability of Ages at Menarche and Menopause April 2001. file - not web page
  Found that the probability that the age of menarche was correlated with latitude was 99.95%
  That is, the international study found that the higher the latitude, the lower the age of menarche
  It is well known that the higher the latitude, the lower the level of vitamin D
• Age of Menarche and menopause - 2001

See also web

• Boys Now Enter Puberty Younger, Study Suggests, but It’s Unclear Why New York Times Oct 2012, no mention of vitamin D
• Age is now 6 to 24 months earlier than 40 years ago (12+ reasons for decrease in vitamin D in the past 40 years)
• African American boys age 9, Hispanic boys age 10, white boys age 10.5 ? (Having dark skin reduces the vitamin D levels from the sun)
• Heaviest boys reached puberty sooner (being overweight reduces the vitamin D level in the body)
• Does vitamin D affect timing of menarche? Jan 2013 - rebuttal paper
  The association was not fully explained by differences in body mass index-for-age z-scores.
  The mechanism for the association, if real, has not been elucidated, but could potentially involve vitamin D receptor polymorphisms.
  Early menarche and vitamin D deficiency are both associated with poor health outcomes, and further exploration of their association is important for women's health.
• More Vitamin D intake may delay precocious puberty Times of India, June 2013
  Reporting on ENDO Meeting in the US
• The influence of puberty on vitamin D status in obese children and the possible relation between vitamin D deficiency and insulin resistance Jan 2015

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