Fatigue and chronic lack of rest and sleep, age, damaged capillaries (smallest
blood vessels around the eyes), periorbital hyperpigmentation (
increased melanin production beneath the eyes making the skin to appear darker), seasonal allergies, eczema, frequent use of stimulants such as
caffeine, smoking, drugs and alcohol, poor skin elasticity and health, lack of antioxidants, diet high in
sugar and other refined products, age, thinner skin beneath the eyes, etc..
Study participants given 1 mg of
caffeine per 1 kg of body weight had on average a 75 mg / dL
increased drop in
blood sugar compared with those who did not have the
caffeine.