The traditional Mediterranean diet is rich in fruit, vegetables, nuts, cereals and olive oil, includes a moderate amount of fish and poultry, and has very little dairy, red meat, processed meat and sweets. The Nordic diet is similar, focusing on vegetables, berries, pulses, whole grain cereals and  fatty fish such as herring, mackerel and salmon. According to a new comprehensive report from the World Health Organization, both diets help to reduce cases of chronic illnesses, such as heart disease, stroke, diabetes and cancers.