Health-promoting activities usually contribute to the prevention of a variety of diseases as well as enhancing a positive feeling of health and vitality. They consist of nonmedical interventions, such as changes in lifestyle, nutrition, and the environment. Such activities may require structural improvements in society to enable the majority of people to take part in them. Structural improvements imply societal changes that make healthful choices easier. For example, dietary modification may be difficult unless a variety of wholesome, tasty and nutrient-rich foods are available in stores at a reasonable cost. Exercise will be more difficult if bicycling or.