How does milk reduce bitterness in coffee?

Question

While making my morning coffee it struck me that a dash of milk reduces the bitterness in coffee, yet the same amount of water doesn’t dilute the coffee as much, so got to thinking, what is it in milk that lessons the bitterness in coffee? I did a google search and was met with “X best ways to reduce bitterness in coffee” which didn’t help.

In: 113

Answer 1

probably because it changes the proportions of caffeine in your cup compared to the amount of everything else like milk or water.