The speed that caffeine starts hitting your body depends very strongly on how full you are when you consume it and how much food/water you’ve already had throug

The speed that caffeine starts hitting your body depends very strongly on how full you are when you consume it and how much food/water you’ve already had throughout the day. The timing after a meal will be very different than an empty stomach, which is probably just minutes. People are more used to noticing the same effects with alcohol.