In Wellbeing A to Z, Episode U, join us as we size up the other weight issue. What happens when you can't put on weight? Being Underweight isn't as glamorous as catwalk models make it seem to be. In extreme cases, it can lead to heart and kidney failure, and even death. Unsaturated fats like those in extra virgin olive oil - are beneficial to your health. Nuts can also up your intake of these healthy fats. We also look at the dangers of UV exposure, and check out the advances in Ultrasound technology.