A greenish or white coating on the tongue can be a sign that the acid in caffeine is disrupting the digestive balance or the oral flora. Those who add sugary syrups or flavored coffee creamers to their coffee have an increased risk of developing geographic tongue – a harmless but unpleasant condition that causes irritation and discoloration.
Good oral hygiene and reducing caffeine (and sugar) consumption can help restore the natural pH balance in the mouth.
8. Swelling or puffiness
Some people are mildly allergic or intolerant to caffeine. In this case, the immune system releases histamines, leading to swelling or a puffy feeling—often in the face, around the eyes, or in the hands. If you feel bloated after your morning coffee or notice that your rings fit tighter, caffeine sensitivity could be the cause.
Keeping a food diary can help determine if caffeine is the trigger.
