A new US study has found that a greater use of social media is linked to a greater risk of eating disorders and body concerns.

The results were seen whether users checked social media frequently, or whether they spent hours at a time scrolling through feeds.

Carried out by researchers from the University of Pittsburgh School of Medicine, the team questioned 1,765 US adults aged 19 to 32 on their use of the 11 most popular social media platforms at the time of the study: Facebook, YouTube, Twitter, Google Plus, Instagram, Snapchat, Reddit, Tumblr, Pinterest, Vine and LinkedIn.

The responses were then cross-referenced with the results of another questionnaire which assessed eating disorder risk, including anorexia nervosa, bulimia nervosa, binge eating disorder and other health issues which included distorted body image and disordered eating.

From the data the researchers found that participants who spent the most time on social media throughout the day had 2.2 times the risk of reporting eating and body image concerns compared to those who spent less time on social media, and those who spent more time checking social media during the week had 2.6 times the risk.

The results were also seen across all demographic groups with participants from every gender, age, race and income affected by the link between social media and eating and body image concerns.

Putting forward an explanation for the strong link between social media and eating and body disorders lead author Jaime E. Sidani commented saying, "We've long known that exposure to traditional forms of media, such as fashion magazines and television, is associated with the development of disordered eating and body image concerns, likely due to the positive portrayal of 'thin' models and celebrities. Social media combines many of the visual aspects of traditional media with the opportunity for social media users to interact and propagate stereotypes that can lead to eating and body image concerns," with senior author Brian A. Primack also adding that it is was still unclear whether social media use was causing eating and body image concerns, or vice versa -- or both.

The team, whose results were published in the Journal of the Academy of Nutrition and Dietetics, now believe that more research is needed to answer the cause-and-effect questions surrounding social media use and body image, which can then be used to develop effect interventions to decrease the risk of eating disorders in users.

Meanwhile there has been a growing backlash in some online communities against the unrealistic beauty standards that media can set, with many viral social media campaigns now trying to tackle the issue and embrace a wider range of body types with hashtags such as 'Thigh Reading', in which Instagram users show off their stretch marks with pride.