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Valley Queen on casein vs. whey. Plus, where whey goes from here.

Valley Queen on casein vs. whey. Plus, where whey goes from here.

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 In this episode of The Milk Check, Ted Jacoby III welcomes Lloyd Metzger and TJ Jacoby of Valley Queen Cheese Company for a deep dive into the science, functionality and future of dairy proteins. The conversation starts at the molecular level – the difference between casein and whey – and builds toward the real-world implications for product developers, processors and nutrition brands. We cover: Why casein is built to carry calcium (and whey isn’t)How heat and pH change protein behaviorFast versus slow digestion and why both matterThe role of whey protein in muscle maintenance, aging and GLP-1 nutritionWhat pro cream really is and why its value may be underestimatedWhy cellular agriculture is more niche than threat If you work in dairy, food formulation or nutrition, this is a protein conversation worth digesting. Got questions? We’d love to hear them. Submit below, and we might answer it on the show. Ask The Milk Check TMC-Intro-final[00:00:00]Ted Jacoby III: Hi everybody, and thank you for joining us today for this very special recording of the Milk Check Podcast. Today, our topic is: what is the future of dairy proteins? And we have two very special guests. The first is Lloyd Metzger, VP of Quality and Technical Services for Valley Queen Cheese Company, and formerly Professor of Dairy Science at South Dakota State University. And the second, particularly special to me, is my son TJ Jacoby, Whey Technologist for Valley Queen. A South Dakota State graduate. Someone who has been interested in dairy proteins since his first biology class in high school. Guys, thank you for joining us today and welcome to The Milk Check. Lloyd Metzger: Glad to be here. TJ Jacoby: Good to be on, Dad. Ted Jacoby III: It’s December 18th, 2025. Milk production in the US is up 4%. Milk production in Europe is up something similar. Milk production in New Zealand is up. Milk production in Argentina is up. We are definitely in an [00:01:00] environment today where the supply of milk and dairy is overwhelming demand, at least for the moment. Cheese prices are near historical lows. Butter prices are near historical lows. Nonfat milk, skim milk powder prices are on the low end of the range. This market is a market that feels heavy, and I think most people out there would say, it almost feels like even though we’re at lows, we may actually go lower before we go higher. And yet, on the other hand, there are whey proteins, Josh, if I’m not mistaken, whey proteins just hit historical highs. Josh White: Maybe the highest prices we’ve ever seen for whey protein isolate and WPC 80. Ted Jacoby III: So, we have an environment where the demand on the protein side is extremely strong, and the trends on protein consumption are extremely strong and really feel like they’re gonna be around for quite some time. We’ve got baby boomers retiring and whether it’s because of GLP-1s or it’s just a general knowledge and understanding of what human nutritional needs are as people age, they know that they need more protein in their [00:02:00] diet. So, it begs the question: what is going on with dairy proteins and whey proteins and how is this going to evolve in such a unique market where demand is so strong for protein right now? And so, I’m gonna ask the question first. What’s the difference at a molecular level between whey proteins and milk proteins? Because when we’re in an environment like we are now, where you’ve got the demand really, really high, you also have a market that’s gonna start looking for alternatives, simply because prices are so high. What is the difference between milk proteins in general and whey protein specifically? Lloyd Metzger: It’s important to talk about from a functional perspective how the proteins are different. I’m sure we’ll get into the nutritional differences between those proteins as well. It’s important to understand what’s driving those differences in functional characteristics. And it’s really all about calcium. The casein system is designed to carry calcium. The whey protein system is not designed to carry calcium. That differentiates the two groups of [00:03:00] proteins and makes their properties very different. TJ Jacoby: I’ll explain it like this. Milk proteins, there’s two classes of proteins, right? There’s casein and then there’s whey. The casein is used to make cheese, and then the whey protein is what comes off. So, the whey protein is everything that is not used to make cheese. So, the reason why casein proteins works so well for cheese because those proteins like to fall together in these spheres, they like to stick to one another. They like to stick to one another ’cause they have certain groups that latch onto the calcium and then they bridge with phosphate. When they do, they have multiple proteins, different types of casein proteins that bridge together with phosphate and then based on their repulsion forces, they stick together. Calcium and...
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