For how we live.
A 210-youth randomised trial of a telehealth aerobic-exercise program found faster symptom recovery at three months than stretching — an edge that disappeared by six months and held only for recent injuries.
In 425 US adolescents followed with phone sensors and Fitbits across 7,591 nights, heavier-than-usual late-evening phone use tracked with later, shorter sleep — the association growing hour by hour toward midnight.
A Global Burden of Disease 2023 analysis of 31 countries finds the burden climbing, peaking in early adolescence and heavier in women, with population growth the single biggest driver.
For a healthy adult an occasional can is unlikely to harm. But in a randomised trial, 32 ounces raised blood pressure and prolonged the heart's QT interval more than placebo — and paediatricians say no to children.
Disordered eating is far more common in adolescents than most parents realise, and weight is a poor guide. A pooled analysis found about 22% of children and teens screen positive, and girls far more than boys.
The global target is an average of 60 minutes a day of moderate-to-vigorous activity, plus muscle-strengthening. Most adolescents miss it: in 2016, 81% worldwide were insufficiently active, and girls more than boys.
Acne is not caused by dirt or bad washing, and it does respond to treatment. Guidelines strongly back benzoyl peroxide and topical retinoids first, with oral isotretinoin reserved for severe or scarring acne.
Enlarged male breast gland tissue is common and usually benign. In a study of 19,640 young males, about three-quarters of cases were idiopathic and only 3.4% were linked to underlying disease.
E-cigarettes are the tobacco product US teenagers use most, and youth use has fallen from its peak. The clearest documented harm is that teens who vape are several times more likely to start smoking cigarettes.
A German trial in 1,793 students found a cognitive-behavioural programme reduced gaming and internet-use disorder symptoms only in high-risk adolescents — not across the whole classroom.
A survey of seven countries found the youth mental health app market dominated by paid journaling and meditation apps. The AI-powered ones show early promise on symptoms — and none had checked for harm.
Two large re-analyses of the same public datasets found the association is real, negative and very small. A third review found the association is not even consistent between the Global North and South.
A laboratory trial found a light-emitting e-reader really does suppress melatonin and delay the body clock. Two 2026 field studies found the day-to-day effect runs almost entirely through when people go to bed.
Among 16-to-24-year-olds in NHANES, those who slept longer on weekends had 41% lower odds of daily depressive symptoms. The survey measured both at the same moment, which limits what can be concluded.
In a US cohort followed eight years, average weekday sleep rose from 8.1 to 8.3 hours while reports of fatigue and trouble sleeping increased. The socioeconomic gap in duration closed; the gap in symptoms did not.
In a US cohort wearing wrist actigraphs, self-reported sleep exceeded measured sleep by about half an hour, with the gap largest on weekends and among Black adolescents and those from lower-income households.