What the United Nations describes as "a state of mental well-being" is crucial for our socioeconomic development.Despite an increasing acknowledgement of the critical role mental health plays in our lives, sufferers of mental health conditions are often stigmatised and discriminated against.For more than 25 years, Devora Kestel, who leads mental health efforts at the World Health Organization (WHO), has been one of the loudest voices in the field, implementing and advising governments on policies related to mental health systems.So what are the consequences of inadequate mental health policies?Devora Kestel, the Director of Mental Health and Substance Use at the WHO, talks to Al Jazeera.Subscribe to our channel http://bit.ly/AJSubscribeFollow us on Twitter https://twitter.com/AJEnglishFind us on Facebook https://www.facebook.com/aljazeeraCheck our website: http://www.aljazeera.com/Check out our Instagram page: https://www.instagram.com/aljazeeraenglish/@AljazeeraEnglish#Aljazeeraenglish#News