Dietary factors are already thought to be a factor in health inequalities, including differences in life expectancy, between the richest and poorest parts of society.

Lifestyle and dietary factors are also being recorded and the group will be followed up every five years.

Unfortunately, dietary factors and antibiotic therapy can lead to an erosion of healthy gut bacteria and the overgrowth of less healthy species, including yeast.

Across the rest of the world malnutrition and associated dietary factors have been implicated.

There are genetic as well as dietary factors that cause neural tube defects.