Past-year creatine use among U.S. adolescents roughly doubled between 2019 and 2024, even as anabolic steroid use continued a two-decade decline, according to a national survey of nearly 875,000 students.

A resurgent social media challenge involving high-dose diphenhydramine ingestion has been linked to seizures, cardiac arrest, and adolescent deaths, with poison center calls more than doubling in the first half of 2026 compared with all of 2025.

A new Endocrine Society guideline favors watchful waiting over immediate evaluation for many girls with early breast development, narrows brain MRI and genetic testing to select cases, and sets age limits for stopping GnRH agonist therapy.

Single-nucleus multi-omics sequencing across genetically diverse ASD mouse models revealed convergent molecular and cellular changes in early brain development, despite distinct underlying mutations.

PCOS was associated with significantly elevated risk for breast, uterine, ovarian/fallopian tube, and cervical cancers in a matched cohort of more than 2.5 million women.

Pregnant participants who sat less and accumulated more light-intensity activity had roughly half the risk of a composite adverse pregnancy outcome in a 470-person prospective cohort study using thigh-worn accelerometers.