Common questions and misconceptions about caffeine supplementation: what does the scientific evidence really show?
Study Goal
The researchers aimed to evaluate the effectiveness and safety of caffeine by addressing 14 specific uncertainties, including its effects on hydration, performance, fat loss, and health risks.
Results Summary
The abstract highlights extensive research on caffeine but notes persistent uncertainties regarding its effectiveness and safety across various contexts, such as dehydration, performance, and health impacts. The study conducted an evidence-based evaluation to address these questions.
Population
Not specified in the abstract.
Effective Dosage
Not specified in the abstract.
Duration
Not specified in the abstract.
Interactions
None mentioned
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
caffeine | increase | exercise performance | - | - | positive effects | #1 |
caffeine | decrease | hydration status | at rest | - | dehydrate you | #2 |
caffeine | decrease | hydration status | during exercise | - | dehydrate you | #3 |
caffeine | decrease | body fat | - | - | promote the loss of | #4 |
habitual caffeine consumption | neutral | performance | - | - | influence the performance response to | #5 |
acute caffeine supplementation | neutral | performance | - | - | influence the performance response to | #6 |
caffeine | neutral | upper vs. lower body performance/strength | - | - | affect | #7 |
caffeine | neutral | depression | - | - | relationship between | #8 |
too much caffeine | increase | mortality | - | - | kill you | #9 |
caffeine | neutral | effects | - | - | sex differences regarding | #10 |
caffeine | neutral | performance response | everyone | - | work for | #11 |
caffeine | increase | heart problems | - | - | cause | #12 |
caffeine | decrease | bone mineral | - | - | promote the loss of | #13 |
caffeine | decrease | consumption | pregnant women | - | should avoid | #14 |
caffeine | increase | dependence | - | - | addictive | #15 |
waiting 1.5-2.0 hours after waking to consume caffeine | decrease | afternoon crash | - | - | help you avoid | #16 |
Caffeine is a popular ergogenic aid that has a plethora of evidence highlighting its positive effects. A Google Scholar search using the keywords "caffeine" and "exercise" yields over 200,000 results, emphasizing the extensive research on this topic. However, despite the vast amount of available data, it is intriguing that uncertainties persist regarding the effectiveness and safety of caffeine. These include but are not limited to: 1. Does caffeine dehydrate you at rest? 2. Does caffeine dehydrate you during exercise? 3. Does caffeine promote the loss of body fat? 4. Does habitual caffeine consumption influence the performance response to acute caffeine supplementation? 5. Does caffeine affect upper vs. lower body performance/strength differently? 6. Is there a relationship between caffeine and depression? 7. Can too much caffeine kill you? 8. Are there sex differences regarding caffeine's effects? 9. Does caffeine work for everyone? 10. Does caffeine cause heart problems? 11. Does caffeine promote the loss of bone mineral? 12. Should pregnant women avoid caffeine? 13. Is caffeine addictive? 14. Does waiting 1.5-2.0 hours after waking to consume caffeine help you avoid the afternoon "crash?" To answer these questions, we performed an evidence-based scientific evaluation of the literature regarding caffeine supplementation.