Problems of Coffee Scum
Coffee scum is the layer of coffee oil that floats on the surface of coffee and they're the unwanted oily party crashers of your morning ritual. Numerous studies have found a connection between coffee oil and higher cholesterol levels.
And when you make coffee with a French press, the scum is the first part of the coffee poured into the cup because it floats on the top. Not only does coffee scum increase your cholesterol and your risk of heart disease, they’re also bitter and can ruin your smooth coffee experience.
We all get enough cholesterol in our diets that we don't need to have our coffee add to it!