The National Institutes of Health (NIH) has issued research findings showing that people with food allergies are more resistant to infection by the novel coronavirus (COVID-19), but that people with a high body mass index (BMI) or obesity are more susceptible to COVID-19 infection.  NIH notes that asthma had no effect on the risk of COVID-19 infection.  To read the NIH announcement and summary of its research findings on food allergies and reduced risk of COVID-19 infection, use the link below.
https://www.nih.gov/news-events/news-releases/food-allergy-associated-lower-risk-sars-cov-2-infection