A picture is worth a thousand words. This is a photo of a truck driver whose face, for nearly 30 years, received the sun on the left side through the window of his truck. The ageing caused by the UV rays on that side of the face is more than evident.
This image has been published in The New England Journal of Medicine accompanied by an article written by doctors Jennifer Gordon and Joaquín Brieva of Northwestern University, Chicago (USA), who have documented and described this extreme case of unilateral dermatoheliosis in a man aged 69 years. This is not a Photoshop retouched photograph. Draw your own conclusions, especially now that the sunbathing season is on us. (Photo: NEJM)
The stem cells that regenerate the skin are regulated by a daily cycle. In the morning, they do very little; their work begins at dusk. Disrupting this natural rhythm ages the skin and may increase the risk of certain cancers.
These are the findings of a study on mice and recently published in Nature, given its possible relevance to humans. Mice, humans and other species share a protein that regulates epidermal stem cell activity and rest phases. We are animals subject to the rotation of the Earth and the day-night cycle. Skin cells are more vulnerable to mutation when they are dividing, so they do not divide in broad daylight when the sun’s harmful UV rays could cause cancer.
It is widely believed that we should drink at least two litres of water a day to keep our skin hydrated. This myth is rooted in the fact that people – doctors included – are concerned about the health of the skin. Scientific evidence has, however, undermined this belief. Drinking plenty of water is healthy, but it does not ensure a smoother skin.
Drinking two litres of water a day to properly hydrate the skin is a belief that emerged strongly in the 20th century and that caught on through beauty magazines and especially the Internet. One version promises that following the so-called 8x8 rule daily (drinking eight glasses of eight ounces each, or almost two litres, of water) makes the skin more elastic, prevents it from drying out and makes it less likely to wrinkle. Read More