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Whey protein seems to be everywhere.

One of the top selling (and most heavily-marketed) nutritional and sports supplements on the market today, whey protein turns up as an ingredient in everything from smoothies to nutrition bars to high-protein cereals.  Personal trainers often include whey as part of their clients’ diet plan, smoothie bars offer it mixed with ice and fruit, and aspiring bodybuilders and soccer moms alike seem to have found a permanent place for a tub of whey protein powder in their pantries.

But what exactly is whey protein powder? Where does this stuff come from? And do you really need it?

A Brief History of Whey Protein

Whey is a natural by-product of the cheese-making process. Milk contains two primary proteins: casein and whey.  Whey composes about 20% of milk proteins, and casein comprises the remaining 80%. So when you drink a glass of milk, you are consuming both casein proteins and whey proteins.

During the cheese-making process, an enzyme called rennet is added to milk to curdle it. The curds are used to make cheese, and the remaining liquid is whey.

Historically, this liquid was considered more-or-less useless. Indeed, the dairy industry had so much excess whey that they struggled with disposing of the surplus. Some of it found its way into swine or cattle feed, where it appeared to produce larger, meatier cows or pigs, but a great deal of it also ended up in the landfill.

Which was really a shame, because the cattle farmers were on to something. It turns out that whey is extremely rich is three milk proteins – specifically beta-lactoglobulin (~65%), alpha-lactalbumin (~25%), and serum albumin (~8%) — which are more easily digested by the body than any other protein, including the holy grail of protein, eggs.

There was just one problem: Whey in its naturally occurring form is a sloppy, liquid mess.  It also has very little flavor. Trying to sell the world on a great protein source that has to be refrigerated and doesn’t have much taste would challenge even the best marketer.

Enter modern technology.  Scientists figured out a way (no pun intended) to “dry” and powder-ize whey, while still maintaining it’s basic nutritional profile.  The result was whey powder, which could be reconstituted in liquids while still preserving its protein values.

The rest, as they say, is history.