With reports that people in the UK don't spend enough time in the sun to get all the vitamin D their bodies need, Angela looks at how to balance that with the knowledge that no sun exposure is safe for our skin. She sees the serious consequences of not getting enough vitamin D and discovers some surprising news about how to get all we really need. Kevin is deciphering the bewildering array of headlines that claim they can help you kick a cold or fend off the flu. And Paralympic runner Danny Crates asks how much exercise we really need - because the papers find it very hard to agree on that and even on what really counts as exercise in the first place.