Whether coffee foam is easy to form depends on the protein content of milk.

Last updated 2026-09-29 — The higher the protein, the more foam the milk produces, and we need not only dense foam to make coffee, but also the taste and fragrance of silk, which requires rich fat content. The more fat, the better the taste of milk, the smaller the size of bubbles due to the role of fat, so try to choose milk rich in fat and protein when making coffee.