Eating too much salt and suffering from dehydration can both contribute to dark circles and under eye puffiness. Drink lots of water throughout the day and avoid excessively salty snacks.
Some blood pressure medications, including beta blockers and diuretics, can contribute to those dark under eye circles we hate. If it’s okay with your doctor, instead of jumping straight to meds, try to get your blood pressure under control in a more natural way through a healthy diet and lowering your overall stress. Incidentally, doing both of those things could work to banish your under eye circles all by themselves.