This is an individual’s adverse physical response to a certain food, beverage, or ingredient. The symptoms might be only digestive problems, such as abdominal pain, bloating, and gas.
However, you may also have fatigue, headache, or “brain fog.” For example, some people have digestive problems and other symptoms after eating too much gluten, a protein found in wheat, barley, and rye. This is different from celiac disease, caused by an immune reaction to gluten that requires complete avoidance of the protein.
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