He felt he was `` drinking way too much caffeine . '' Up to 80 percent of all Americans consume caffeine products every day . About half Americans experience withdrawal symptoms if they do n't partake . Symptoms include headache , fatigue , sleepiness , inability to concentrate . The higher the sugar intake , the more likely a person will suffer .
Up to 80 percent of all Americans consume caffeine products every day . About half Americans experience withdrawal symptoms if they do n't partake . Symptoms include headache , fatigue , sleepiness , inability to concentrate . The higher the sugar intake , the more likely a person will suffer .