Allergies - respiratory like asthma and bronchitis, and skin related problems such as eczema and rash - generally worsen during winter. An expert suggests ways to improve immunity by eating vitamin rich food. "Allergy is a reflection of reduced immunity. To improve immunity, fruits rich in vitamin C such as oranges, sweet lime and lemon should be incorporated into the diet," Ravindra Gupta, Consultant - Internal Medicine, Columbia Asia Hospital, Gurgaon said in a statement. "People should have a balanced diet with lots of green vegetables, fruits and nuts," he added.He says it's best to avoid food items such as milk, yoghurt, cheese, ice cream, bananas and cucumbers as these trigger a number of problems like eczema and asthma. People with allergic tendencies are also more sensitive to smoke produced by cigarettes, vehicles or even incense sticks. Common symptoms of allergies are burning eyes, cough and shortness of breath. Eat food items rich in Omega-3 fatty acids, which contain natural anti-inflammatory agents to fight allergies. Good sources of Omega-3 are soya bean, pumpkin seeds, walnuts and salmon. Fruit juice and green tea should also be included in your diet. For the latest food news and recipes, like us on Facebook or follow us on Twitter and get the NDTV Cooks app for Android or iOS.