If you have diabetes here is some good news for you scientists have created a drug for Type 2 diabetes that is switched on by blue light thus paving the way to reducing side effects of diabetes medication. The drug would be inactive under normal conditions but a patient could in theory switch it on using blue LEDs (light emitting diodes) attached to the skin. Only a small amount of light would need to penetrate the skin to change the drug's shape and turn it on. This change is reversible so the drug switches off again when the light goes