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.
Lessen your intake of foods that have high levels of mineral iron. Iron is commonly found in foods such as red meat, chicken, liver, eggs, beans, and some fish such as tuna, salmon, cod, haddock and some shellfish. Get in the habit of choosing white meat over red, and avoid eating the seafood mentioned above.