However, in developed countries, lifestyle and diet are changing.
People have busier lives. They are working longer hours, so they are more likely to suffer for stress.
They do not have time to prepare proper meals.
They eat processed or fast food instead, which contains a higher proportion of fat, salt and sugar.
They do not walk so much, and some do not do any physical activity at all.
As a result, the percentage of the population with heart disease or cancer is increasing.