Food intolerance is estimated to affect 45% of the population and can cause digestive issues, IBS, headaches, joint pain, and other symptoms. It is caused by factors like stress, antibiotics, alcohol, and processed foods. While some foods may not affect one person, they can cause problems for another individual due to unique food sensitivities. Taking a food intolerance test involves a simple finger prick blood test sent to a lab for analysis, followed by consultations to safely eliminate trigger foods and find nutritious alternatives.