*If you've been affected by issues raised by the reports on Calendar and on our website, advice can be found at the website for 'Beat', the country's leading eating disorder charity. *
Their telephone helpline number is: 0808 801 0677
Many people long for a healthy lifestyle, but health experts are warning fitness apps and weight loss trackers, such as Fitbit and MyFitnessPal, are fuelling eating disorders among vulnerable people.
We've spoken to a number of people who say their mental illness was made worse by using their Fitbit, relying on a calorie counting app, or by what they saw on Instagram and other social media.
WATCH: the online documentary below or on YouTube.