A long term reaction is one that may not appear for days, months, or years. Usually, allergy reactions will appear after a few days of being exposed to, or ingesting, several different allergens in sufficient quantity. Some toxic reactions may take months or years before they accumulate in sufficient quantity to reach the threshold level. Some toxins are stored in the fatty-acid tissues and reactions occur now and then when fats are used up during stressful times, when dieting, or improper eating. This is especially true of heavy metals, pesticides, herbicides, and some other chemicals, including food additives, colorings, and preservatives.
Most heavy metals are also excellent conductors.
The heavy metals, absorbed in the tissues of the brain can interfere by short-circuiting the normal flow of the electrical impulses, interfering with memory, emotions, and the autonomic nervous system. Heavy metals act as a catalyst which increases the production of free radicals, which can lead to cancer, heart, liver, and kidney disease. Chelation theraphy for heavy metals sometimes reduces these risks and may reduce allergy reactions. Many of the chemicals used in food additives for preservatives, colorings, and artificial flavors are in such small quantities that they appear harmless. Pesticides and herbicides used for growing crops, and hormones used in raising farm animals are used in minute quantities, too.