Forced expiratory volume over 1 second (FEV1) is a dynamic measure of flow used in formal spirometry. It represents a truer indication of airway obstruction than does peak flow rate. Although peak flow rate usually correlates well with FEV1, this correlation decreases in patients with asthma as airflow diminishes.
Vegetarian Protein Sources. If you follow a vegetarian or vegan diet, get your protein from a variety of sources to ensure sufficient intake of the indispensible amino acids. Plant sources of protein include beans, soy, lentils, nuts and seeds.
Foods to Increase Red Blood Cells. Eating the right foods can help increase the number of red blood cells in your body. Here are a few of the ways you can eat your way to better blood cell health: 1  Iron. 2  Food rich in iron can help your body rebuild what it has lost. 3  Lentils and legumes are a great way to get the iron you need and they are healthy for you in many other ways, too. 4  Copper.