It has been established that food intolerance is responsible for the vast majority of adverse reactions. Some doctors believe these intolerances are linked to the additives, preservatives or naturally occurring toxins within the food, rather than the food itself. If you are consuming foods which you are intolerant to, your digestive system may not produce enough of the right chemical or enzymes to break these foods down, which can cause your body to react badly. As the body is continuously bombarded with the same kinds of refined foods, it is placed under a great deal of physical stress. Under this type of stress, the body becomes naturally depleted of water, which in turn will increase the production of the chemical histamine levels. The body’s immune/defence system is thrown off balance and food sensitivities and tolerances can then develop. Intolerances are far more common with foods that are difficult to digest, such as wheat or dairy products and in people with weak digestive systems. Intolerances can develop at any time of life and many people suffer without even knowing they have an intolerance to a particular food. Symptoms caused by a food intolerance rarely occur immediately after eating the offending food, but can come on several hours or even days later, making it difficult for you to detect the potential offending substance.