Trust me I'm a doctor. 1/3.

This documentary is presented by medical journalist, Michael Mosley, who takes a light-hearted look at the science behind various health claims, with the assistance of various other doctors. Firstly, he looks at sunshine and whether it's good or harmful for us. He considers research that suggests more than half of UK adults don't have sufficient Vitamin D levels. He investigates ways this can be changed through sunshine, oily fish and supplements, with a team of volunteers in Bognor Regis. Meanwhile, Dr. Chris van Tulleken asks whether some high carbohydrate foods can be made healthier by changing the way they're prepared. In particular, he looks at pasta with a test group in an Italian restaurant. He finds out from Dr. Denise Robertson that just by changing the temperature of pasta when it's eaten you can make it healthier and reduce calories. The cooking process appears to alter the structure of the starch in the food. This is resistant starch and generates a lower blood sugar. Surgeon, Gabriel Weston talks briefly about varicose veins. A&E doctor, Saleyha Ahsan, looks at acupuncture and investigates if, and how, it works in relation to the brain's pain matrix. Gabrielle Weston looks at overexposure to sun and whether advice on sun exposure should be revised. Exposure to UVA light appears to trigger a reduction in blood pressure. She looks at a study examining nitric oxide in the skin. Chris van Tulleken considers whether plastic water bottles can cause cancer. He looks at the chemical Bisphenol A in particular. Dr Saleyha Ahsan gives a group of cyclists instructions on how to deal with a bad wound. Michael Mosley considers differing medical views on saturated fat. He asks whether we should be switching away from saturated fat to polunsaturated fat. Research suggests the evidence isn't clear cut and he speaks to two researchers on opposing sides of the debate, Professor Kay-Tee Khaw and Professor Christian Drevon. Dr Saleyha Ahsan looks at whether Vitamin C or Zinc can help with the common cold. Gabriel Weston looks at pioneering research into paralysis from spinal cord injury. She meets a group of researchers at the University of Louisville in Kentucky who are attempting to change the situation for their patients, in particular former motocross rider, Kent Stephenson. They have worked on using a stimulator and implants to aid physical movement by bypassing the spinal cord. The programme finishes by looking at the results of their studies in Vitamin D.