As many of you may already know, caffeine stays in our systems for quite some time after consumption. In fact, is follows an exponential decay, with a biological half life of ~5.7 hours. Curious to see just how long different popular drinks last in our system, I created a chart to show the decay of various popular beverages (assumes an 8oz serving size, x-axis is hours post-consumption where ‘null’ is 0 hours after consumption i.e. the original caffeine value):
So, for example, we can see that the caffeine content in an 8oz serving of coffee decays from 140mg upon consumption (labeled ‘null’ on x-axis) to 123.9mg after 1 hour of digestion, and 32mg 12 hours post-consumption.
Want to check the decay of a specific drink/caffeine value? Check out this small tool I created.
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