Medical and public health scholars believe that at least there are several environmental factors that can explain the epidemiology of allergies.
- Health hypothesis (environment is too clean)
Some scholars believe that the environment is too clean that leads to more allergies. They advocate the need to contact some bacteria in childhood to develop proper immune. Some parents over-protect their children, too emphase on cleaning habits, so children rarely expose to some common bacteria.
- Air pollution
Air pollution may provoke more respiratory allergies. Carbon monoxide, sulfur dioxide and other gas locomotive exhaust, will cause the deterioration of human tracheal inflammation. On the other hand, the living environment has become increasingly closed. Doors and windows are close in high-rise buildings, with the use of air conditioning, resulting in poor air circulation that strive for allergens to grow. The survey found that if the home is well-ventilated, the amount of dust mites and other allergens can reduce by half.
- Overuse of antibiotics
Children use of antibiotics or antipyretics before 1-year-old, the probability of asthma and other allergies will increase. Abuse of antibiotics kill bacteria, affect the development og our immune system and kill the probiotics in our GI tract. When the good bacteria in the GI tract is inhibited, the function of the GI mucosa is reduced, it cannot effectively prevent the digestion of food molecules into the bloodstream. These molecules can be detected by the immune army as “dangerous”, thus stimulating food allergies and may make you more sensitive to other allergens.
- Having a Westernized diet with too much processed foods
The Westernized diet have made is intaken more oil and calorie that stimulates the secretion of inflammation mediators prostaglandins and leukotrienes. The more these substances in the body, the more serious the symptoms will be when having an allergic attack. Some scholars believe that modern people eat too much processed foods (such as candy, biscuits, etc.), all those carbohydrates quickly convert into sugar in the human body. Too much sugar, like too much antibiotics, to promote the growth of intestinal yeast, interfere with the GI mucosa function, paving the way for the allergic reaction.