e-Library of Evidence for Nutrition Actions (eLENA)

Welcome to eLENA


The WHO e-Library of Evidence for Nutrition Actions (eLENA) is an online library of evidence-informed guidance for nutrition interventions.

eLENA is available in all six official languages of WHO. To view eLENA content in another language, click on the appropriate link at the top right of the web page, directly above the social media icons.

New feature providing cost-effectiveness information


11 February 2019 -- eLENA has been updated with a new feature providing links to more than 100 peer-reviewed articles and reports assessing the cost-effectiveness of a wide range of nutrition interventions in a variety of contexts and settings.

New and updated interventions

WHO / SEARO /Nimal Garnage

19 December 2017 -- eLENA has been updated to include interventions from the recently released guidelines Protecting, promoting and supporting breastfeeding in facilities providing maternity and newborn services and Assessing and managing children at primary health-care facilities to prevent overweight and obesity in the context of the double burden of malnutrition

New guidance

WHO /Andy Craggs

31 October 2017 -- eLENA has been updated with new guidance on nutritional care in older adults from the WHO guideline WHO Guidelines on Integrated Care for Older People (ICOPE):

New guidance

Frederic Noy

27 September 2017 -- eLENA has been updated with new guidance on deworming from the WHO guideline Preventive chemotherapy to control soil-transmitted helminth infections in at-risk population groups:

New nutrition actions

WHO/SEARO/Karen Reidy

11 January 2017 -- As part of eLENA's expanding catalogue of nutrition actions, the latest evidence and guidance is now available for the following interventions:

Systematic review summaries


11 January 2017 -- eLENA has been updated with a new feature that provides convenient access to key elements of systematic reviews which serve as the evidence base for interventions in eLENA.

Summaries provide methodological information, key results and conclusions of the authors of the reviews in a concise, yet detailed format.

New feature linking interventions and WHO global targets


03 August 2016 -- eLENA has been updated with a new feature that provides users with a convenient way of identifying nutrition interventions which, when implemented, may contribute to progress towards achieving the WHO global nutrition and diet-related NCD targets.

eLENA mobile phone application


Access the latest WHO nutrition guidelines, recommendations and related information for nutrition interventions, wherever you are, with eLENAmobile, available for iPhone and Android smartphones.