Some people can have one cup of coffee and be good for the rest of the day. Others have to drink several cups of coffee in order to feel the desired effects. People either have a low, regular or high-sensitivity to caffeine. If a person has a low-sensitivity to caffeine, then this means that caffeine has little or no effect on them.

People with a low-sensitivity to caffeine can drink coffee all day without feeling any effects of it. People who have a regular sensitivity to caffeine can drink a few cups of coffee without having it disrupt their sleep. Those who have a high-sensitivity to caffeine will be impacted by it in small doses.


Mayo Clinic has stated that healthy adults should not have more than 400 milligrams of caffeine per day. This is about four cups of coffee. There is also new research that will help you determine how much caffeine you need.

The research was conducted by the United States Army. They came up with an algorithm that can help people determine exactly how much caffeine they need in order to function. Jaques Riffman, who works for the Department of Defense, was one of the people who helped develop the algorithm.

Jaques had several subjects participate in various activities. He then noted their caffeine intake and the number of hours that they slept. The algorithm then calculated recommended caffeine dosage based on the information given.

People who love coffee need to realize that the excess caffeine can affect them later on. They may have more energy initially, but it can cause them to become fatigued later in the day. The algorithm not only helps people determine how much caffeine they should drink, but it also helps them determine when they should drink it.

This algorithm is being tested on United States army veterans. They hope that they will be able to use this information to create an app in the future. This algorithm is not yet available to anyone outside of the military yet.

Ref: https://www.independent.co.uk/life-style/health-and-families/coffee-how-much-drink-alertness-when-caffeine-us-army-algorithm-app-a8387376.html