For how we live.
An interrupted time-series study of 32.9 million births estimated roughly 2,300 more preterm births to Latina women than expected in the nine months after November 2016. It is an association, not proof of cause.
A Kaiser Permanente analysis found acute cardiovascular hospitalisations ran 1.62 times higher in the two days after the 2016 vote than the week before. It is an association, and cannot prove the election caused it.
Slow breathing does shift the body toward calm, but the popular 4-7-8 count has almost no direct trial evidence, and the breathwork that has been tested in a large study is a different pattern.
Two meta-analyses of 104 trials found music lowered both felt stress and physical markers like heart rate. The effect is consistent and moderate — larger for how stressed people feel than for blood pressure.
Writing about your thoughts and feelings has a real but small average effect across 146 trials; a web-based journaling study eased anxiety in medical patients. Useful, not a cure.
Grinding and clenching in sleep is common, and in healthy people experts now class it as a behaviour rather than a disorder. But the evidence on how common it is, and what causes it, is thinner than you would expect.
Yes — the hormones released under stress push glucose up, which is why steroids and severe illness cause hyperglycaemia. Whether everyday stress raises long-term diabetes risk is a smaller, murkier effect.
Chronic stress is linked to weight gain, and cortisol is one plausible route. But the measured associations are modest, and cortisol is a contributor, not the master switch that supplement marketing implies.
The puffy 'cortisol face' and the 'cortisol cocktails' sold to fix it lean on 'adrenal fatigue' — a condition a systematic review of 58 studies found no evidence for. True cortisol excess is a diagnosable disease.
A Nature study traced stress-driven greying in mice to sympathetic nerves that deplete pigment stem cells. Separate human work shows some grey hairs regain colour.
Randomised trials show lower self-reported stress and anxiety, but the certainty is low, the studies are small and wildly inconsistent, and a separate evidence strand flags liver and thyroid risks.
The best evidence frames procrastination as a way of dodging bad feelings about a task, not a scheduling flaw — and following students over a year, more of it tracked with more depression, anxiety and stress.
The pooled effect on self-reported stress was g = -0.35 from 785 participants. The authors of the meta-analysis warn against a miscalibration between the hype and the evidence — their phrase, not ours.
Pooled trials find forest therapy lowers stress, anxiety, and blood pressure short-term. But heterogeneity is high and reviewers grade the certainty as low to very low.
Age, sex, employment and socioeconomic level together explained under 1% of variance in insomnia severity. Perceived stress and generalised anxiety explained close to a third.