People who have signed up to online dating are less happy with their face and body, worry more about being attractive and compare themselves to others.
The findings affect more than nine million people in Britain who have used a dating site or app.
The decree also reinstated 236 people to their jobs.
"There are some strange programmes that would scrap the institution of family, take away its nobility and sanctity," Kurtulmus said at the time.
Some see in this decree the first traces of Turkey sliding back away from the secular state, established less than a century ago by the creator of modern Turkey, Mustafa Kemal Ataturk, and toward conservative Islam under Erdogan.
Those who have never looked for a partner online were found to spend much less time thinking about their appearance because they were not being ‘validated by others’.
The US study, published in the journal Body Image, states that dating sites give people only a short space to write about themselves, so that they are mainly judged on their photos.
Two weeks after winning the Turkish constitutional referendum by a modest but decisive margin, president - or perhaps it is now despot - Erdogan decided to take his newly decreed powers for a spin and overnight in rapid succession surprised foreign observers when Turkey decreed that it would ban TV dating shows, fire an additional 4,000 public officials and also ban Wikipedia.