Drinking coffee helps you to be more alert and less sleepy at work. However, excess intake of caffeine can aggravate your dandruff problem. Caffeine is a diuretic, hence can cause the body to expel water. Too much excretion of water from the body may lead to dry skin, which can cause flaking on the scalp. Caffeine is also present in tea, soda and energy drinks.
To know more about the diet, you should have to prevent dandruff, click this link; https://www.thehealthsite.com/beauty/does-the-food-you-eat-affect-your-dandruff-status-781379/