Barcelona: Walnuts are rich in a nutrient that protects the health of arteries, scientists have discovered.

It is the damage caused by fatty foods which causes hardening of the arteries, the main cause of heart attacks and stroke.

In a study at Spain’s Hospital Clinico new research published in the Journal of the American Cardiology reveals that just of an ounce of walnuts a day (28g) – seven or eight nuts – is enough for optimal health.

The research is the latest to reveal the health benefits of eating seeds and nuts such as almonds, pumpkin and sunflower which contain vital protective oils and other nutrients.

In the study, Dr Emilio Ros, an expert in heart health, examined how walnuts countered the effects of eating fatty foods in a group of healthy adults. The results showed that even amongst those who ate fatty foods such as cheese and salami, the walnuts helped preserved elasticity and flexibility.