Unpleasant side effects may occur when you suddenly stop consuming any caffeinated beverage, including caffeinated diet sodas. These side effects are likely if you consistently consumed more than 500 mg of caffeine per day, according to the Cleveland Clinic. Gradually reducing your caffeine intake may help avoid some of these symptoms. The American Heart Association notes that individuals who experience caffeine-withdrawal effects generally feel symptoms for only a day or two. In addition to caffeine-withdrawal symptoms, you may possibly experience further withdrawal side effects from the artificial sweeteners found in diet sodas. However, specific side effects from artificial sweetener withdrawal haven't been scientifically confirmed. If you have specific questions or concerns about any unusual symptoms after quitting your consumption of caffeinated diet soda, consult your doctor.
Tiredness
The caffeine found in diet pop acts as a stimulant, providing short-term energy boosts. Over time, your body may become accustomed to the caffeine and need it to maintain a normal energy. When you suddenly limit your caffeinated pop consumption, your body doesn't receive this energy boost, and feelings of fatigue may result. Like the other symptoms of caffeine withdrawal, this symptom is temporary and your typical energy level should be restored within a few days.
Headaches
Approximately 50 percent of people who suddenly quit consuming caffeine experience headaches, Aetna InteliHealth states. Over-the-counter pain relievers can soothe the pain from these headaches, but only select one that doesn't contain caffeine to prevent rebound headaches from occurring, suggests the Cleveland Clinic.
Changes in Mood
A sudden lack of caffeine consumption may also produce mood changes. This includes feelings of irritability and depression. Let your family members or friends know that you might not act like yourself for several days as your body gets used to being without caffeine. If your mood change is severe, call your doctor.



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