There's a new perspective on how we think about the cause and progress of Alzheimer's disease. Are we actually doing the right thing by removing accumulated amyloid protein from the brain of people with it? Health practitioners are often still operating under the assumption that obesity is an individual's responsibility, even though science now tells us otherwise. It makes intuitive sense that if you screen people for disease the outcome will be good - because you get on top of the problem. But how far should you go.