Two sources of protein that can be very beneficial to most vegans are soy and wheat gluten. Unfortunately, some people are either allergic to one or both, or think that they are. If you suspect that these foods are causing trouble for you, you should certainly consult with a physician. However, it is worth noting that most people should be fine with consuming these foods.
Soy allergies are rare. They occur mainly in young children with atopic dermatitis, who often outgrow the allergy after 1-2 years of dietary elimination. Allergic reactions in adults are less frequent.
On the flip side, Dr. Michael Greger reportsthat people who eat plant-based diets have lower rates of chemical, drug, and environmental allergies. He also reportsthat consumption of meat by pregnant women may result in an increased incidence of atopic diseases such as food allergies, asthma, hay fever, and eczema in their children.