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Citrus fruits and tomatoes, though valuable sources of fiber and nutrients, may also worsen asthma symptoms. Though foods affect people with asthma differently, Cutler lists citrus fruits and tomatoes as common symptom triggers.
Some foods, colourings and preservatives may trigger asthma symptoms or make them worse. Some people may also experience hives, rash, nausea, vomiting and diarrhoea. It may help to keep a food diary to track what's causing allergic or asthma reactions. Talk to your doctor if you have concerns.