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Caffeine dependence can cause a host of physiological effects if caffeine consumption is not maintained. Commonly known caffeine withdrawal symptoms include headaches, fatigue, loss of focus, lack of motivation, mood swings, nausea, insomnia, dizziness, cardiac issues, hypertension, anxiety, and backache and joint pain; these can range in severity from mild to severe. [18]
With some TikTokers blaming their mid-afternoon energy crashes on drinking coffee first thing in the morning, researchers are spilling the beans on the pros and cons of delaying your caffeine intake.
Caffeine remains stable up to 200 °C (392 °F) and completely decomposes around 285 °C (545 °F). [190] Given that roasting temperatures do not exceed 200 °C (392 °F) for long and rarely if ever reach 285 °C (545 °F), the caffeine content of a coffee is not likely changed much by the roasting process. [191]
The therapeutic dose of theophylline, however, is many times greater than the levels attained from caffeine metabolism. [46] 1,3,7-Trimethyluric acid is a minor caffeine metabolite. [5] 7-Methylxanthine is also a metabolite of caffeine. [193] [194] Each of the above metabolites is further metabolized and then excreted in the urine.
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Caffeine has also been shown to have moderate appetite-suppressing effects. Research suggests that consuming coffee 0.5–4 hours before a meal may reduce caloric intake. Although the same study ...
] Caffeine in coffee takes up to half an hour to have an alerting effect, hence "a short (<15min) nap will not be compromised if it is taken immediately after the coffee." [23] [24] [25] One account suggested that it was like a "double shot of energy" from the stimulating boost from caffeine plus better alertness from napping. [1]
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