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.
Combine spinach with other sources to increase iron content: Spinach may not be a rich source of iron but when eaten in combination with other foods, it can be a good source of iron. In fact, knowing what foods to eat and not eat with spinach can help maximise iron absorption.