Decreased levels of this very important nutrient has shown prevalence of asthma in children and adults. Several studies show association between low levels of vitamin D and decreased lung function. Try to get natural sunlight daily so your body can make up for the deficiency , also add supplements if needed
Vitamin C helps in decreasing the nflammatory responses in the airways and also lessens the spasms of the bronichial passages. Researche also suggests that vitamin reduces wheezing and breathlessness. Eat mangoes, guava, tomatoes, papaya, oranges, amla, and green vegetables.