Donating a unit of whole blood or double red cells (2-units) removes iron from your body. You need iron to make new red blood cells. Low levels of iron can cause anemia or make it worse. All blood donors should learn more about iron. 1  Everyone should eat a healthy diet.2  All blood donors should add foods rich in iron to their diet.ou need iron to make new red blood cells. Low levels of iron can cause anemia or make it worse. All blood donors should learn more about iron. 1  Everyone should eat a healthy diet. 2  All blood donors should add foods rich in iron to their diet.
What is the 'Average-Cost Method'. The average-cost method is a costing method by which the value of a pool of assets or expenses is assumed to be equal to the average cost of the assets or expenses in the pool. BREAKING DOWN 'Average-Cost Method'.
Jupiterimages/Photos.com/Getty Images. Weighted average costing is one among many different types of inventory cost accounting methods that companies use. Other common methods include the more common last-in, first-out, or LIFO method, and the first-in, first-out, or FIFO method.upiterimages/Photos.com/Getty Images. Weighted average costing is one among many different types of inventory cost accounting methods that companies use. Other common methods include the more common last-in, first-out, or LIFO method, and the first-in, first-out, or FIFO method.