Daniel Hackam, associate professor at Western University in Canada, explains how shift patterns can have a detrimental effect on the vascular health of workers.

Also this week Seena Fazel, Wellcome Trust senior research fellow in clinical science at the University of Oxford, queries the predictive value of the risk assessment tools routinely used to predict violent behaviour

A feature this week asks "Should patients be able to control their own records?". The website renalpatientview.org allows patients to do exactly that. Neil Turner, a professor of nephrology at Edinburgh Royal Infirmary, explains how he and colleagues developed the resource.

Also Steven Woloshin and Lisa Schwartz, authors of the "Not So Stories" column have turned their statistical scrutiny onto a recent advert by Susan G. Komen for the Cure®, the breast cancer charity. They explain how the case for mammography has been massively oversold.

This week we’ll hear why Donald Light, professor of comparative health systems research at the University of Medicine and Dentistry of New Jersey, thinks the innovation crisis in the development of drugs is more marketing rhetoric than reality.

Also this week, a research paper on bmj.com looks at how subclinical psychological distress affects mortality. Tom Russ, Alzheimer Scotland clinical research fellow at the University of Edinburgh and one of the paper's authors, explains what they found.

Marion Nestle is the Paulette Goddard Professor of Nutrition, Food Studies, and Public Health at New York University. She has written widely about food and nutrition, and is an iconoclast in the world of food politics. In this podcast she explains how economic forces have changed the food industry, and how that change is fuelling the obesity epidemic.

Over the decades public health has had many incarnations. Geof Rayner and Tim Lang (Center for Food Policy) argue that public health today needs an overhaul, and to focus on our co-existence with nature and relationships with each other. They explain why, and how.

Many of the issues Dr Rayner and Professor Lang are concerned about are being taken up by the People's Health Movement. Member Jonny Currie explains what he wants the movement to achieve, and others involved talk about actions they are taking.

In 2008 the rates of suicide in the UK began to increase. Is it a coincidence that this was also when the financial crisis hit? Ben Barr, research fellow in the department of Public Health and Policy at the University of Liverpool, explains what his study found.

Those who've attempted to kill themselves once are at high risk of doing so again, but interventions to prevent this have been hard to find. Merete Nordentoft, professor at the Mental Health Centre Copenhagen, University of Copenhagen, talks us through the results of her study examining a promising candidate.

It's increasingly obvious that acutely ill patients have received less than gold standard care. Deficiencies in training are often blamed. Paul Frost, consultant in intensive care medicine at the University Hospital of Wales, takes us through the admission of an acutely ill patient.

Also this week, BRCA mutations and ionising radiation both increase the risk of developing cancer, but how do these risk factors combine? Anouk Pijpe, an epidemiologist at the Netherlands Cancer Institute, explains the results of her retrospective cohort study.

A BMJ head to head article this week asks: "Are the causes of obesity primarily environmental?" John Wilding, Head of the Department of Obesity and Endocrinology at the University of Liverpool, and Tim Frayling, professor of human genetics at the University of Exeter, argue their cases.

Also this week, David Williams, a consultant obstetric physician at University College Hospital London, explains why pre-eclampsia is easily missed.

This week we concentrate on diabetes

"The difference between insulin management in type 1 and type 2 diabetes is rather like the difference between driving a sports car and driving a lorry," says Edwin Gale, emeritus professor of diabetes at the University of Bristol. He tells us why this means the newer insulins that have benefits in the treatment of type 1 diabetes may not be as good for type 2.

Sripal Bangalore, director of research at the New York University School of Medicine, discusses his research into the relative effectiveness of different types of stents in diabetes patients

Schemes which reduce emergency admissions sound like a good thing, but Martin Rowland, professor of health services research, Cambridge Centre for Health Services Research, University of Cambridge, explains how they can go off track.

And Mabel Chew gets some advice on the prognosis of children with acute coughs from Matthew Thompson, a senior clinical scientist in the Department of Primary Care Health Sciences, Oxford University.