New research reveals how stress, weight and hormonal patterns interact to influence when puberty begins, providing new insights into long-term health risks and opportunities for early intervention.
Research: Steroids, stress, and BMI interact to promote female pubertal development. Image credit: Viktoriia Patapova/Shutterstock.com
recent diary Clinical endocrinology and metabolism In this study, we identified steroid metabolomic patterns associated with early pubertal timing and tested whether BMI and stress markers alter this relationship.
Pubertal timing, stress, and steroid metabolome
Menarche, the beginning of the first menstrual period, marks the social transition to adulthood as well as an important biological milestone in adolescence. Breast development (thelarche) is preceded by approximately 2 to 4 years, and the interval between the two, called pubertal tempo, has its own clinical significance. Early menarche, early menarche, and prolonged menstrual cycles each increase the risk of breast cancer by 20 to 30 percent.
The timing of puberty is regulated by a cascade of hormonal changes that involve the broader steroid metabolome rather than estrogen alone. As part of the hypothalamic-pituitary-adrenal (HPA) axis, the adrenal glands also release glucocorticoids in response to stress. The androgen to glucocorticoid ratio serves as an indicator of stress reactivity. A higher ratio indicates a hyporesponsive stress response, and a lower ratio indicates a hyperreactivity. As puberty progresses, adrenal androgens are joined by ovarian production of androgens, estrogens, and progesterone via the hypothalamic-pituitary-ovarian (HPO) axis, which jointly promote breast development, puberty, and menarche.
Elevated body mass index (BMI) and psychosocial stress are both independently associated with early puberty, suggesting meaningful crosstalk between the metabolic, stress, and reproductive axes. However, most studies have investigated these factors alone rather than in combination, and the combined and potential synergistic effects of stress and BMI on pubertal timing remain poorly understood.
Experimental and rodent data support a direct interaction between the stress and reproductive axes during adolescence, a period of heightened neuroplasticity during which the HPA axis is actively recalibrated. Once adolescence is complete, this stress-responsive plasticity decreases. How these dynamics play out in human populations and whether the steroid metabolome captures this interaction remains largely unknown.
Identification of steroid metabolomic signatures and their modifiers indicative of accelerated puberty
The study hypothesized that early life stress increases glucocorticoids and androgens, converting adipose tissue to estrogen that promotes breast development, and that increased BMI in combination with stress is associated with earlier onset of puberty. These relationships were investigated in girls with and without a family history of breast cancer.
The LEGACY Girls Study enrolled 1,040 girls ages 6 to 13 at five sites, including 51% with a family history of breast cancer and 49% with matched controls. These participants were followed every 6 months for adolescent assessments, biospecimens, and anthropometry.
Thelarche and pubarche were primarily assessed using the Pubertal Development Scale (PDS). First morning urine was analyzed by gas chromatography-mass spectrometry (GC-MS). Metabolites were grouped by hormone class and expressed as ratios to separate androgen-independent associations. Stress was measured using the Internalizing Composite Scale (anxiety, depression, and somatization subscales), and BMI was derived from biannual height and weight measurements.
At baseline, family history of first- through third-degree cancer was collected along with birth weight and maternal race/ethnicity to calculate the Breast and Ovarian Cancer Incidence and Carrier Estimation Algorithm (BOADICEA) continuous risk score. We then used a parametric survival (Weibull) model to predict the median age of puberty onset.
Interactions of hormones, stress, and BMI shape puberty progression
The average age of participants was 8.1 years, and 74% identified as non-Hispanic white. The majority were not overweight or obese, had asymptomatic stress scores (less than 60), and more than half had mothers with bachelor’s or graduate degrees.
Prepubertal steroid metabolite pathways were significantly associated with uvula development in both crude and adjusted models. Higher total metabolites, glucocorticoids, androgens, and progesterone metabolites each predicted earlier onset, whereas higher estrogen predicted later onset. The Pubarche association mirrored the Thelarche association, with increased androgen-to-glucocorticoid ratios accelerating both milestones. Prepubertal estrogen was the only hormonal factor significantly associated with the timing of menarche, with higher levels associated with delayed menarche.
After adjusting for covariates and prepubertal estrogen levels, higher adolescent estrogen levels were associated with delayed menarche. Elevated androgens and progesterone during puberty similarly predicted delayed menarche at a given menstrual age, indicating a prolonged tempo of puberty. A higher androgen-to-glucocorticoid ratio is associated with earlier menarche, and this effect is even stronger when prepubertal hormone levels are taken into account.
The stress-BMI-hormone interaction significantly altered menarche and menarche but had no effect on puberty. Prepubertal girls with higher glucocorticoids, BMI, and stress reached climax 7.2 months earlier than those with lower values. Due to high BMI and high stress, In this subgroup, higher glucocorticoid levels were associated with earlier menarche, and higher BMI and lower stress were associated with later menarche.
Under low BMI/low stress conditions, prepubertal progesterone had the strongest association with earlier menarche, and pubertal estrogen had the strongest delay in menarche. However, elevated androgen and progesterone levels during adolescence were associated with earlier menarche only in the high BMI/low stress subgroup.
Principal component analysis confirmed these findings. Twelve components captured 95% of the variation in steroid metabolites, four of which were related to vocalization timing. A major component characterized by high levels of glucocorticoids and other abundant metabolites was associated with early spring and long pubertal tempo. A combination of ingredients characterized by high androgens and progesterone and low glucocorticoids was associated with premature ejaculation, longer tempo, and faster hair growth. Significant increases in pregnanediol were associated with prolongation of vomer, menarche, delayed menarche, and tempo. Stress and BMI further altered two of these factor associations.
conclusion
Elevated glucocorticoids and androgens were associated with earlier onset of puberty and longer duration of puberty, regardless of family history of breast cancer, especially in girls with high BMI and high stress. Screening between the ages of 8 and 10 years, combined with stress reduction and lifestyle interventions, may help identify and help girls who are at risk for adverse effects on their menstrual and breast health later in life.
Given that past studies have associated these hormones with up to a 2.6-fold increased odds of developing breast cancer, long-term hormonal biomarker tracking has potential as a future screening tool, especially as the incidence of early-onset breast cancer continues to rise.
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