While not a good tool for diagnosing asthma, peak flow, and peak flow meters are good to monitor asthma over time. You may see declines in your peak flow prior to developing significant symptoms. This will allow you to alter your treatment regimen based on your asthma care plan.
Increase your intake of calcium, which inhibits the absorption of iron in the body. Eat more milk products, green leafy vegetables, oats and cereals (check to see that these are not fortified with iron). Milk products, such as ice cream, cheese, yogurt, are rich in calcium.
Eat red meats, eggs, poultry, fish and leafy green vegetables such as spinach to build up your iron supply. Fortified cereals also contain iron and make a good breakfast choice the morning you donate. Don't drink tea with iron-rich foods; tannins in tea interfere with iron absorption.