Caffeine is present in many diet pills, and you may incorporate it into a controlled diet for weight loss. However, caffeine is unproven as a weight-loss aid and may be dangerous for individuals with caffeine sensitivity or certain medical conditions. The only proven method of losing weight long term is to consume fewer calories than you expend. Consult your doctor before making significant dietary or lifestyle changes.
Caffeine and Water Weight
For some people, caffeine can induce weight loss by acting as a diuretic. This means that caffeine can increase your urine output and decrease the amount of water weight in your body. If caffeine acts as a diuretic for you, this can cause temporary weight loss as you lose water weight. However, this is not the same as losing body fat, and water weight will usually return when you rehydrate.
Metabolism Boost
Caffeine can provide a small boost to your metabolism if you are susceptible to this effect. Dietitian Katherine Zeratsky indicates caffeine can cause thermogenesis, meaning your body burns food for energy and heat. Zeratsky indicates increased thermogenesis is unlikely to burn sufficient calories for significant weight loss. However, if a dose of caffeine makes you feel more energetic and active, you will burn additional calories by moving around more.
Appetite Suppressant Qualities of Caffeine
Like the nicotine found in cigarettes, caffeine can act as an appetite suppressant for some people. If you are susceptible to the appetite-suppressing potential of caffeine, this may mean that you consume fewer calories through food, making it more likely you will lose weight. However, caffeine may also act as an appetite stimulant, making you likely to eat more and struggle harder to lose weight.
Considerations
Excessive caffeine consumption causes anxiety, jitteriness, insomnia, and even dizziness and fainting. For healthy adults with no caffeine sensitivity or underlying medical conditions, the caffeine present in 4 to 6 cups of brewed coffee daily is a reasonable upper daily limit. Caffeine-sensitive individuals and those with heart or neurological conditions may experience adverse effects after a much smaller caffeine dose.
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