Having a healthy diet, exercising and not being overweight can not only reduce the risk of developing heart disease, but may also protect against Alzheimer’s, new research claims.

The research is being presented to 4,000 scientists at the six-day Alzheimer’s Association conference in Stockholm, Sweden, from Saturday, the largest meeting dedicated to the disease.

So far doctors have been unsure about what causes Alzheimer’s disease – although, both genetic and environmental influences are thought to play a part.