Article Text

Download PDFPDF
Health promotion and public health
Daylight and dementia: don’t stop going outside
  1. Carys Bromby1,
  2. Tomas Welsh1,2,3
  1. 1 Research Institute for the Care of Older People, Bath, UK
  2. 2 Older Persons' Unit, Royal United Hospitals Bath NHS Foundation Trust, Bath, Bath and North East Somer, UK
  3. 3 Translational Health Sciences, University of Bristol, Bristol, Bristol, UK
  1. Correspondence to Dr Tomas Welsh, RICE, Research Institute for the Care of Older People, Bath, UK; tomas.welsh{at}

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.

Commentary on: Ma LZ, Ma YH, Ou YN, Chen SD, Yang L, Dong Q, Cheng W, Tan L, Yu JT. Time spent in outdoor light is associated with the risk of dementia: a prospective cohort study of 362094 participants. BMC Med. 2022 Apr 25;20(1):132. doi: 10.1186/s12916-022-02331-2.

Implications for practice and research

  • There is no indication to advise changes to current practice on the basis of this study.

  • This study underlines the methodological challenges which face researchers using large data sets.


Dementia is a syndrome characterised by progressive changes in cognitive function that are evident in more than one cognitive domain and which interfere with day-to-day life. Dementia can be caused by a number of different conditions but Alzheimer’s disease remains the most commonly diagnosed cause. Despite decades of drug development, there are no effective licensed disease-modifying treatments for Alzheimer’s disease. As a result, there has been focus for some time on potentially …

View Full Text


  • Competing interests None declared.

  • Provenance and peer review Commissioned; internally peer reviewed.