Reasons to wait 90 minutes before coffee

Having coffee immediately upon waking is generally acceptable if it suits the individual, taking into account its effects on anxiety, the stomach, and sleep. It is advisable to avoid it before bedtime. Although some recommend delaying coffee consumption for 60 to 90 minutes after waking to prevent the caffeine from interfering with the natural buildup of adenosine, scientific evidence supporting the benefit of this delay for everyone is limited. Caffeine works by blocking adenosine receptors and enhancing alertness. Waiting periods have not been shown in controlled studies to prevent energy dips or significantly impact daily energy levels. Additionally, people who regularly drink coffee develop a tolerance to its hormonal effects, which reduces the body's anxiety response to caffeine.