Red in the Face: People use your skin colour to judge how healthy you are

Apr 01, 2009
The face on the left is drained of blood and starved of oxygen, making it look pale and bluish. The face on the right looks healthy because it is flushed with blood and has lots of oxygen, making it look bright and rosy. Credit: The image is supplied by Perceptionlab.com, University of St Andrews

(PhysOrg.com) -- People use the colour of your skin to judge how healthy you are, according to researchers at the University of St Andrews.

Scientists in the School of have shown that there is truth to the received wisdom that a "rosy" complexion denotes healthiness, whilst a "green" or "pale" colour indicates illness.

Lead researcher Ian Stephen worked with the University's Perception Lab to determine how face colour is associated with healthy looks.

Several monkey species use redness in their faces or sexual to advertise their health status and to attract mates. The team was keen to discover whether similar mechanisms were at work in humans.

Ian Stephen said, "Parents and doctors know that when you get ill, you can end up looking pale. Our research goes further and shows that even young, healthy university students can benefit from a complexion reflecting more blood and more oxygen in the skin."

The team from the University of St Andrews first measured how skin colour varies with the amount of blood and oxygen in the blood.

These measurements were used with to allow research participants to change the colour of the faces in the photographs to look as healthy as possible. The team found that, for all faces, participants added more oxygen rich blood colour to improve the healthy appearance.

Ian continued, "Our skin contains many tiny that carry blood laden with oxygen to the skin cells, allowing them to 'breathe', and allowing us to lose heat during exercise. People who are physically fit and have higher levels of have more of these blood vessels and flush easier than people who are unhealthy, unfit, elderly or smokers. Physically fit people also have more oxygen in their blood than people who are unfit or have heart or lung illnesses."

Professor Dave Perrett, head of the Perception Lab commented, "Our evaluators all thought that bright red blood with lots of oxygen looked healthier than darker, slightly bluer blood with lower oxygen levels. It is remarkable is that people can see this subtle difference.

"This may explain why some people with very red faces do not look so healthy; the colour of their blood may be wrong. So it's not just the amount of blood that's important it's the type of blood that determines healthy looks."

The research shows that people use the colour of the blood in your skin to judge how healthy you are.

"Since your attractiveness relies upon how healthy you look, you might be able to make yourself more attractive by being kind to your heart and lungs in doing more exercise or quitting smoking," concluded Ian Stephen.

More information: The paper, 'Skin Blood Perfusion and Oxygenation Colour Affect Perceived Human Health' by Ian D Stephen, Vinet Coetzee, Miriam Law Smith and David I Perrett is published in PLoS ONE today: dx.plos.org/10.1371/journal.pone.0005083

Provided by University of St Andrews

Explore further: Patients with dissociative identity disorder find it difficult to recall specific memories

add to favorites email to friend print save as pdf

Related Stories

Scientists discover new hemoglobin type

Mar 17, 2008

Scientists at the University of Bonn have discovered a new rare type of haemo-globin. Haemoglobin transports oxygen in the red blood corpuscles. When bound to oxygen it changes colour. The new haemoglobin type appears optically ...

The elderberry way to perfect skin

Jul 03, 2007

Forget expensive moisturisers and cosmetic surgery, a compound found in the humble elderberry could give a natural boost to skin.

Psoriasis lesions loaded with newly discovered immune cell

Feb 22, 2008

A new study of psoriasis patients shows that a recently discovered immune cell, called Th17, appears to be a key player in the disease and occurs in far higher concentrations in their skin than occurs in skin of healthy individuals.

Found - the apple gene for red

Nov 30, 2006

CSIRO researchers have located the gene that controls the colour of apples – a discovery that may lead to bright new apple varieties.

Less of a stink in diabetes patients?

Mar 16, 2009

Hydrogen sulfide (H2S) is commonly associated with smell of rotten eggs, stink bombs and blocked drains but lower blood levels of the gas are possibly linked to cardiovascular complications in some male patients with type ...

Recommended for you

Research proves physical, psychological power of love

5 hours ago

New Western-led research says pausing to think about your romantic partner generates 'good stress' and adds an energy boost to your day. The study, Energized by love: Thinking about romantic relationships increases positive ...

User comments : 0