FUN in the sun could help tackle weight gain and diabetes, according to Southampton scientists.

Researchers at the University of Southampton believe ultraviolet rays could hold the key after testing the effects of sunlight on overfed mice.

The UV rays react with a compound called nitric oxide which is released by the skin after exposure to sunlight and can curb weight gain.

Affected mice also showed much fewer signs of developing diabetes, such as abnormal glucose levels and resistance to insulin.

And the scientists say a cream containing the compound could have the same effect when rubbed into the skin, combined with a healthy diet and exercise.

Previous studies in people have shown that nitric oxide can also lower blood pressure after exposure to UV lamps.

Dr Martin Feelisch, professor of experimental medicine and integrative biology at the University of Southampton, said: “These observations further indicate that the amounts of nitric oxide released from the skin may have beneficial effects not only on heart and blood vessels but also on the way our body regulates metabolism,”

The Southampton scientists worked alongside colleagues at the University of Edinburgh and the Telethon Kids Institute in Perth, Western Australia, where the study was led.

Dr Richard Weller, senior lecturer in dermatology at the University of Edinburgh, added: “We know from epidemiology studies that sun-seekers live longer than those who spend their lives in the shade. Studies such as this one are helping us to understand how the sun can be good for us.

“We need to remember that skin cancer is not the only disease that can kill us and should perhaps balance our advice on sun exposure.”

But more testing is required on humans according to the team, as mice are not usually exposed to large amounts of sunlight.