Metadata
- Author: Pmc.ncbi.nlm.nih
- Full Title:: Common questions and misconceptions about caffeine supplementation: what does the scientific evidence really show?
- Category:: 🗞️Articles
- URL:: https://pmc.ncbi.nlm.nih.gov/articles/PMC10930107/pdf/RSSN_21_2323919.pdf
- Read date:: 2024-12-31
Highlights
Does caffeine dehydrate you at rest? Recent research has revealed that moderate daily caffeine doses (~3 mg/kg or approximately 250-300 mg) do not appear to increase urine volume in habitual caffeine consumers. On the contrary, much higher doses (6 mg/kg or more than 500 mg) may induce acute elevation of urine output. Nevertheless, the typical consumption of caffeine (i.e. usually in a beverage) has little to no effect on fluid balance. (View Highlight)
Does waiting 1.5-2.0 hours after waking to consume caffeine help you avoid the afternoon “crash?” There is no evidence that caffeine ingestion upon waking is somehow responsible for an afternoon “crash” or that delaying consumption would somehow prevent this if it did occur. (View Highlight)