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According to a new study by University of Auckland, women in their mid-30s to mid-40s are most likely to feel dissatisfied with the way they look after using Facebook.

For women Facebook-users, body satisfaction levels begin to fall at around 30 years but did start rising again as they got older - at around 50.

Women who didn't use Facebook had higher body satisfaction overall.

"We know from previous studies that media in general can make women feel bad about the way they look," said doctoral candidate Samantha Stronge.

"What we see in this study is that those findings are replicated for social media users and in this case, women who use Facebook on a fairly regular basis," she noted in a statement.

The study group of more than 11,000 people was made up of 62.5 percent women and 37.5 percent men aged 18-years-plus with a mean age of 49.23 years.

They included both Facebook users and non-users.

Among women, 69 percent had a Facebook profile and 58 percent had used it in the past week.

Overall, women used Facebook more often than men.

The study showed women Facebook users in their mid-30s to mid-40s had the lowest level of body satisfaction of any group, with women aged 38 least happy with the way they looked of any age group.

In general, men reported higher levels of body satisfaction than women but men who used Facebook still reported lower levels of body satisfaction than their non-Facebook-using counterparts.