A tried and true method, spicy food can help clear nasal passages fast. Spicy chemicals in hot foods irritate mucous membranes, causing the nose to run and clear out mucus. While eating, the runniness of the nose may increase, but this allows mucus to be cleared out for good, leaving passages clear after the meal.
One study suggests that regular consumption of spicy foods can be a huge boon to people with chronic cold symptoms.

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