What is "simplesse"

Simplesse \Sim"plesse\, n. a trade name for a fat substitute prepared as microparticles of protein from whey. It has little fat, but has a consistency and taste resembling fat, and is thus used to prepare foods low in fat for dietetic purposes. [Trade name]

Simplesse is a multi-functional dairy ingredient made from whey protein concentrate used as a fat substitute in low-calorie foods. Originally brought to market in 1988, the manufacturer, CP Kelco (a former NutraSweet subsidiary), sells Simplesse to food processors as a "microparticulated whey protein concentrate" in dry powder form, and recommends that it be labelled as dairy protein on food labels.

The protein is partially coagulated by heat, creating a micro dispersion, in a process known as microparticulation. It is due to the small particle size of the protein that we perceive the dispersion as a fluid with similar creaminess and richness of fat.