a substance found naturally in some foods, formed from the breakdown of protein as foods age. Generally, the longer a high-protein food ages the greater the tyramine content. Many aged cheeses, red wine, alcoholic beverages and some processed meats have been reported to be high in tyramine. Eating foods with tyramine can trigger migraines in some people. People taking MAO inhibitors must be careful not to eat foods containing tyramine, as this can cause increased blood pressure.