Medical investigations proved that more people are nowadays experiencing severe food allergies than ever before, as quarter of foods sampled were found to contain several undeclared allergens.
Food allergies firstly appeared during the 1930s, but it did not have sudden reactions as it appears to have today.
Back then, Food allergists targeted people who had delayed reactions, occurring up to 48 hours after eating the alleged food, leading to physical effects such as eczema, diarrhea, asthma, migraine and psychiatric problems, including depression and hyperactivity.
However, doctors refuted food allergists’ claim that a food allergy was responsible for much undiagnosed chronic illness.
Then in 1990s, a Canadian Medical Association Journal tackled a peanut allergy case thus bringing to light the association between food allergies and severe fatal allergies rather than the chronic food allergies on which food allergists had previously concentrated.
Along the years, several theories on the root of food allergies emerged based on scientific research, but the lack of open-minded studies is preventing a breakthrough.
One suggestion is the hygiene hypothesis where children seem to grow up in extremely clean environments making their bodies unable to differentiate between unsafe pathogens and safe proteins.
Another is infant feeding suggesting that the mother with a family history of a food allergy should feed her offspring from early age the alleged food.