Nearly six in ten young women get health and wellness advice from influencers, new research shows.

Women aged 18 to 29 were more likely than young men to use online influencers for health information.

The topics included beauty, alternative medicine, mental health, weight loss and fitness.

The Pew Research study found that 57 per cent of women aged 18 to 29 said they get health and wellness information from online influencers, 10 percentage points higher than young men.

While Americans still mostly rely on healthcare providers, the research suggests social media influencers also play a major role in how young people find health advice.

Among women who get health and wellness information from influencers, 51 per cent said they often hear about beauty and appearance, compared with 18 per cent of men.

Young women were also around twice as likely as young men to say they see content about alternative medicine, meaning treatments or health practices used outside mainstream medical care.

A third or more of both young men and young women said they often hear about mental health and weight loss from influencers.

Around half or more of both groups said they often see fitness content.

When asked why they seek health and wellness information from influencers, around half of young women said they wanted to make a change to their health or lifestyle.

That compared with 37 per cent of young men.

The research also found that 23 per cent of young women said hearing from people who share their background or beliefs was one reason they used influencers, compared with 14 per cent of young men.

A further 19 per cent of young women said they learnt about things they did not want to ask their doctor, compared with 10 per cent of young men.

Cosmetic procedures may become addiction-like for some women, with low body esteem and problematic social media use linked to higher risk, new research suggests.

A study of 1,614 women aged 25 to 71 found that one in five who had undergone treatments met the threshold for moderate to severe risk of addictive cosmetic procedure use.

Low body esteem and problematic social media use emerged as the strongest risk factors.

Researchers from the Hebrew University of Jerusalem and the Israel Center for Addiction and Mental Health examined what they described as addictive cosmetic procedure use, or ACPU, among Jewish Israeli women.

ACPU refers to repeated cosmetic treatment behaviour that may resemble addiction, including feeling unable to stop, continuing despite negative effects or craving further procedures.

The study was led by Vera Skvirsky alongside Uri Lifshin, Dvora Shmulewitz and Mario Mikulincer, from the department of psychology at the Hebrew University of Jerusalem and the Israel Center for Addiction and Mental Health.

The researchers surveyed women from the general population rather than focusing only on patients at cosmetic clinics.

Among women who had undergone cosmetic procedures, 20 per cent met the threshold for moderate to severe lifetime risk, while more than 15 per cent reported symptoms within the previous year.

Across the full sample, nearly nine per cent of women showed moderate to severe signs of problematic cosmetic procedure use.

The researchers adapted questions based on mental health criteria used to assess substance-related disorders.

Participants were asked whether they had tried unsuccessfully to stop having cosmetic procedures, felt compelled to continue despite negative consequences or experienced cravings linked to treatment.

Previous research has linked cosmetic procedures with body-image concerns and body dysmorphic disorder.

Body dysmorphic disorder is a mental health condition in which a person becomes highly distressed by perceived flaws in their appearance, often flaws that others may not notice.

The new study examined whether repeated cosmetic procedures may, in some cases, resemble a behavioural addiction.

Women with lower body esteem were more likely to report addiction-like patterns, particularly when this was combined with high levels of problematic social media use.

Participants who reported problematic or excessive social media behaviour appeared especially vulnerable when they also felt dissatisfied with their appearance.

The researchers also found smaller links between addictive cosmetic procedure use and lower feminist attitudes, lower attachment security and more negative attitudes towards ageing.

However, those links were less consistent when several factors were analysed together.

The findings come amid a sharp global rise in cosmetic procedures, with international estimates cited by the researchers suggesting interventions increased by around 40 per cent between 2019 and 2023.

The researchers stressed that the study does not suggest cosmetic procedures are inherently harmful.

Instead, they said repeated engagement may, for some people, take on characteristics similar to behavioural addictions already recognised in mental health research.

The researchers said: “Cosmetic procedures have become deeply normalised in many societies, and for many people they may be a positive experience.

“But our findings suggest that for a meaningful minority, the behaviour may begin to resemble other compulsive patterns we see in addiction research, especially when low body esteem and problematic social media use are involved.”

The study was cross-sectional, meaning it captured a single point in time and cannot prove cause and effect.

Researchers said it remains unclear whether problematic social media use contributes to addiction-like cosmetic procedure behaviour, whether treatments influence body image and online engagement, or whether other psychological factors drive both.

SSRIs may help women with depression tolerate extreme heat, with responses more like those without depression, a laboratory study suggests.

Selective serotonin reuptake inhibitors, or SSRIs, are medicines commonly used to treat mental health conditions including depression and anxiety.

Media reports, social media posts and the US Centers for Disease Control and Prevention have suggested SSRIs may increase vulnerability to heat-related illness.

However, researchers found that women with clinical depression who took an SSRI may withstand extreme heat better than those not treating their depression with medication.

The study was carried out by researchers in the Penn State Department of Kinesiology.

Kathleen Fisher, first author of the study, said: “The human body primarily cools itself in two ways, by sweating and by increasing blood flow to the skin so that heat can be released to the environment.

“This study showed that depression interferes with how women’s bodies regulate their temperatures in the heat. Fortunately, SSRIs seem to largely restore the body’s ability to respond to increases in internal temperature.”

The team compared women without depression with those diagnosed with the condition, including women taking different types of antidepressants.

When their body temperatures rose, women with untreated depression were slower to begin sweating and increasing blood flow to the skin.

Their bodies were also less efficient at pumping blood to the skin than those of women without depression and women taking an SSRI.

Depression affects about 10 per cent of the US population and is twice as common among women, the researchers said.

SSRIs, including sertraline and fluoxetine, and serotonin and noradrenaline reuptake inhibitors, or SNRIs, including duloxetine and venlafaxine, are commonly prescribed alongside counselling to treat depression.

Previous research suggests depression disrupts the body’s ability to regulate temperature.

Penn State researchers had previously found that blood vessels dilated less effectively in women with depression. Dilation allows blood vessels to widen, helping more blood reach the skin to cool the body.

Women taking SSRIs showed improved blood vessel dilation similar to that seen among people without depression.

The latest study examined whether the same improvement occurred during heat stress.

Researchers recruited 64 women, almost all in their 20s. The group included 16 without depression and 16 with depression who were not taking medication.

A further 16 had depression and were taking an SSRI, while 16 had depression and were taking an SNRI.

Participants swallowed a small capsule that transmitted their internal body temperature throughout the experiment.

They then wore a suit fitted with tubes that allowed researchers to pump heated water through it.

After 10 minutes of adjusting to water at 91°F, around 33°C, the temperature was raised to 125°F, around 52°C.

The experiment ended when each participant’s internal temperature had risen by 1.8°F, or 1°C. This took an average of 45 minutes.

Researchers also measured skin temperature on the arm, calf, chest and thigh, along with heart rate, blood pressure, blood flow to the skin and sweating.

Professor W Larry Kenney, a study co-author, said: “The water pumped into the suit was 125 F, causing skin temperature to rise to about 100 F.

“As the skin continued to be heated to temperatures similar to sitting in a hot tub, the women’s internal temperature continued to rise.”

Women with untreated depression were slower to begin sweating and increasing blood flow to the skin than women without depression.

When blood flow to the skin increased, it was less efficient. Despite beginning to sweat later, women with untreated depression did not sweat less overall.

Women taking SSRIs responded to heat in a similar way to women without depression.

By contrast, women taking SNRIs responded similarly to those with untreated depression. SSRIs therefore normalised responses to heat stress, while SNRIs did not.

Researchers found no differences in blood pressure between the four groups.

Fisher said: “Up until now, there has been very little data on how depression or any of these classes of antidepressive drugs affect people’s responses to heat stress.

“This study took the first step toward understanding how women with depression, whether taking medications or not, may respond to extreme heat.”

Kenney said the findings challenged common beliefs that SSRIs increase vulnerability to heat.

He said: “In prior studies, my collaborators and I have identified how several factors, especially age, sex, and activity level, contribute to risk from extreme heat.

“Additionally, there has been widespread concern that many medications contribute to heat vulnerability, but the research evidence behind the risks of many medicines is often thin or nonexistent.

“Both physicians and people taking SSRIs should be aware that these medications do not seem to contribute to heat vulnerability. Rather, SSRIs improve heat tolerance in depression.”