Why is Protein Powder Milky?

Protein powders are a go-to supplement for those looking to boost their muscle growth and aid recovery after exercise. But why is protein powder always based on milk?

Everywhere you go there are flavours based on chocolate, vanilla, or every kind of milk tea imaginable. This also means that a lot of protein tastes pretty bad when mixed with water, because the flavours only work well when they are strong and rich.

In this article we'll explore why this is the case, covering the production of whey protein, the elements contributing to its milky aspect, advancements in making it taste better, and various ways to enjoy protein powder beyond just shakes.

From Dairy to Powder

Whey protein starts its life as a byproduct of cheese or yogurt production. Initially considered waste, it was found to be a rich source of protein. To turn this liquid into the powdery form we use, it undergoes filtering and drying processes that concentrate its protein content.

The milky appearance and sometimes lumpy texture of protein powder shakes stem from how proteins interact with water at the molecular level. When whey protein is processed, its structure changes, sometimes making it more difficult for the powder to fully dissolve, especially in cold liquids. The remaining milk sugars and fats also affect how smooth or creamy the drink becomes.

The types of whey protein we get out of this are explained more in depth here, but basically whey protein concentrate (WPC) can contain 70-85% protein, whereas whey protein isolate (WPI) is even purer, with over 90% protein. This transformation not only retains whey's impressive nutritional qualities but also affects how it dissolves and feels when we drink it.

Understanding Protein Powder's Texture

Protein drinks can be lumpy if the powder isn’t mixed thoroughly or if it’s added to the liquid too quickly. This is due to protein molecules binding with each other before they’re hydrated, creating clumps that resist mixing. If you’re wondering “why is my protein shake lumpy,” it usually comes down to the order of mixing and the temperature of the liquid.

The milky appearance of whey protein when mixed with liquids comes down to two main factors:

• Solubility: The methods used to process whey protein—like applying heat or filtering—can make the protein less soluble. This means it doesn't dissolve as smoothly in water, leading to a cloudy drink.
• Lactose Content: WPC still contains lactose, a type of sugar found in milk, which contributes to the milky taste and feel. Even WPI, which has much less lactose, has enough to impact the overall texture and appearance.

The processing intended to increase the protein content inadvertently results in the milk-like qualities of whey protein drinks.

The Flavour Challenge

Unflavoured whey protein doesn't taste great on its own, being slightly bitter and milky (but has advantages because you can add whatever flavours you want to it). To address this, manufacturers use a variety of flavouring techniques:

• Sweeteners such as sucralose or stevia help counteract the bitterness.
• A range of flavour extracts, from vanilla and chocolate to fruit, to enhance taste.
• Additives like soy lecithin improve the smoothness and richness of the texture, which changes how you experience the taste.

These methods help turn whey protein into a tasty treat, with a wide variety of flavours available. However, it is hard to make a drink that both tastes amazing and stays fresh over a long time: and that's why a lot of protein tastes overly sweet, too strong, or just plain bad.

Beyond the protein shake, we also recommend you trying out some of these options to boost your nutritional intake:

• Baking: Incorporate it into cookies, muffins, and bread for a protein boost.
• Smoothies: Combine with your favorite fruits, milks, and greens.
• Coffee: Add a scoop to your morning coffee for extra protein.
• Snacks: Mix into oatmeal, chia pudding, or even homemade ice cream.
• Ready-to-drink: Grab a pre-made shake for convenience on the go.

Looking for inspiration? Browse our collection of protein drink recipes, including shakes, smoothie bowls, and even baked treats, to make your protein powder routine exciting and delicious. Share your favourite uses, flavours, and recipes with us on social media, tagging @proteadrinks and we'd love to feature you!

The Future of Protein Taste

The quest to improve protein powder continues, focusing on making it dissolve better, taste nicer, and feel smoother. Techniques like micro-filtration and enzyme treatment are being explored to tackle issues like grittiness and lactose content. Additionally, plant-based proteins offer alternative nutritional values and textures, catering to diverse dietary preferences. There's even development into clear protein, making a shake that tastes great in water!

If that sounds like something you're interested in, we offer a clean, less-sweet protein iced tea based on 100% whey protein isolate. Find out more on the protea product page.

Exploring the science behind protein powder's milky texture and flavour challenges helps us appreciate it not just as a supplement, but also as a food ingredient. We're excited to see how people will continue to incorporate it into their diets in new and delicious ways.