The supply and consumption of micronutrients is not uniform throughout the year due to the provision and storage of foods, for example, fruits and vegetables as a source of vitamin C. The extent to which this seasonal variation occurs is different between high-income versus low-income countries and between urban versus rural regions, and in case of vitamin C, reflected in lower plasma ascorbic acid concentrations when the harvest approaches. Graphing food balance sheet data, the amount of fruit and vegetables consumed has changed over time (see