Up to 90 percent of North Americans consume caffeine products every day . Score: 7 Symptoms include headache , fatigue , sleepiness , inability to focus . The higher the caffeine intake , the more likely a patient will suffer .
Up to 90 percent of North Americans consume caffeine products every day . About half will experience withdrawal syndrome if they do n't partake . Symptoms include headache , fatigue , sleepiness , inability to focus . The higher the caffeine intake , the more likely a patient will suffer .