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.
While iron is better absorbed from heme (meat) sources, non-heme (plant) iron is better regulated causing less damage to the body. High iron foods include clams, liver, sunflower seeds, nuts, beef, lamb, beans, whole grains, dark leafy greens (spinach), dark chocolate, and tofu. The current daily value (DV) for iron is 18 milligrams (mg). Below is a list of high iron foods. For more high iron foods see the lists of high iron foods by nutrient density, iron rich foods (heme and non-heme), and the list of fruits and vegetables high in iron.