Migraines and tannins - overview Migraine and Tannin Overview Tannins are brown chemicals that provide the colour in many foods and drinks. They occur naturally in many plants, such as nuts, bruised fruit, red grapes and any woody parts of plants. They also occur in many processed foods, such as red wine, brandy, apple juice, tea.
Tannins seem to be created to discourage animals from eating the plants.
They seem to be designed to disturb the digestive system of whatever is eating the plant, and to do other things. Through evolution, our bodies have learned over the years to be able to cope with such substances in our food. But we do not cope very well. They can still hurt us. Tannin can also be beneficial.