Why high-protein milk is becoming coffee’s latest fascination

Key takeaways

• Almost half of US adults are trying to eat more protein, and 70% of European consumers are paying attention to their protein intake.
• Two-thirds of Americans drink coffee daily, making it an easy way to boost protein intake.
• Starbucks charges up to US$2 for protein milks and add-ons, and customers are willing to pay.
• MILBOK‘s double milk offers 5.5g of protein per 100ml with no additives.

Protein now appears across the entire food and beverage industry. Supermarkets worldwide stock protein-fortified yoghurt, milk, and cereal, and even protein sodas, as health and wellness trends shape what consumers buy.

Coffee is following the same pattern. The global protein coffee market is predicted to grow from US$6.67bn in 2026 to US$11.53bn by 2034, and so far, chains have led the way. Starbucks, for example, launched protein cold foam in Europe, North America, and Asia-Pacific between September 2025 and June 2026, and the pace signals a category that’s likely to last.

Specialty coffee shops, focusing on quality above all else, have an opening to offer protein with more intent. Instead of adding ingredients that complicate the menu, they can start with one of the simplest ingredients they already stock: milk.

You may also like our article on finding the perfect milk for coffee shops.

Protein has become an everyday expectation

Protein is no longer a concern for athletes. Circana’s research found that 48% of US adults are actively trying to eat more protein. In Europe, meanwhile, seven in ten consumers across all age groups are paying attention to protein in their diet.

The motivations for increasing protein intake are broad. Consumers increasingly link protein to fullness, improved energy, and better muscle recovery, backed by scientific research. Protein increases satiety and appetite control by lowering hunger hormones, including ghrelin (the hormone that tells your brain when you are hungry), triggering the release of satiety hormones like GLP-1, and slowing digestion to delay the return of hunger.

The rise in GLP-1 medication use is a newer driver. Gallup’s survey found that 11% of US adults currently take GLP-1 medications for weight loss, up from 3% in 2024, while other research estimates that 8.25 million people in the UK have taken, are taking, or are considering taking GLP-1 weight loss medications. These drugs suppress appetite, so users are advised to prioritise protein in order to preserve muscle mass while losing weight. 

Other research from Circana shows that 65% of GLP-1 users actively seek more protein at every meal, including breakfast. For a daily habit like coffee, this raises a practical question. Customers who want to increase protein intake at every meal may soon expect to find it in their morning coffee.

Why coffee is a natural landing spot for protein

Protein products work best when incorporated into existing consumer habits, and few are as regular as coffee. The 2026 National Coffee Data Trends Fall Report found that 66% of US adults drank coffee in the past day, with specialty coffee consumption at a new record high. Milk-based espresso drinks account for much of this growth, so protein comes from an ingredient customers expect and know.

Dairy protein also matters for physiological reasons. Research from 2024 explains that leucine, an amino acid found in high-quality proteins such as milk, triggers muscle protein synthesis. About 2.5 to 3g of leucine in a single meal is needed to fully trigger muscle growth, which requires 25 to 35g of protein per meal.

Additionally, the combination of casein and whey proteins in milk supports muscle growth. Whey is absorbed in about 60 to 90 minutes, spiking blood amino acid levels, while casein absorbs slowly and releases amino acids over several hours. This provides an immediate surge of amino acids for muscle building and a sustained trickle to prevent muscle breakdown.

Many people drink coffee before exercise, and caffeine is well documented as a performance aid. The Journal of the International Society of Sports Nutrition found that caffeine consistently improves exercise performance at doses of 3 to 6mg per kg of body mass. The combination of caffeine and protein is also important; caffeine fuels performance during workouts, while protein protects your muscles and starts the recovery process after, so a milk-based coffee can deliver multiple benefits.

Protein intake is often concentrated in evening meals, but research suggests spreading protein evenly across the day keeps a steady supply of amino acids in your blood to maximise muscle repair and stabilise energy. This means high-quality milk-based coffee drinks, consumed in the mornings, can be a valuable protein source.

New opportunities for coffee shops

Milk has long been added to coffee, changing texture, sweetness, and nutritional value. Protein follows the same instinct, but the scale of investment is new. Starbucks launched protein lattes and protein cold foam across the US and Canada in September 2025, and then in Europe in April 2026 and Asia-Pacific markets from June 2026. Dunkin’ followed with its own protein milk in January 2026, signalling a major shift in consumer preferences.

The wider market is moving in the same direction. Circana projects that households using GLP-1 medications will account for 35% of all US food and beverage units sold by 2030, meaning demand for protein-enhanced products, including coffee, will continue to rise.

Protein is a question of margin as well as nutrition for café owners. Starbucks charges US$1 to add protein milk and US$2 for protein cold foam, and CEO Brian Niccol has called the platform “highly incremental”, meaning it adds sales rather than replacing existing ones. In supermarkets, fairlife ultrafiltered milk sells at a 190% premium per ounce over regular whole milk at Walmart, according to DairyReporter.

Consumer willingness to pay matters because major chains like Starbucks, Dunkin’, and Pret A Manger have dropped plant-milk surcharges, reducing what cafés can charge for different milks. A high-protein milk option gives customers another reason to trade up.

But it also poses operational challenges

Adding protein to milk can be challenging. Whey isolate is the quickest way to add protein to drinks at home, but it is one of the harder options in a café. This is because whey proteins become less soluble as a liquid’s acidity nears its isoelectric point (a neutral pH electrical charge). As filter coffee is acidic, usually between 3.97 and 4.25 pH levels, whey proteins are likely to curdle or form a grainy texture.

Heat from steaming also makes whey isolate proteins clump. Researchers at Wageningen University found significant aggregation above 70°C at pH 4.0 and 4.5, and the Wisconsin Center for Dairy Research says drink manufacturers usually need stabilisers, such as pectin, to mitigate clumping.

Powder also adds a preparation step. Starbucks, which uses powder, blends 2% milk with unflavoured protein powder and prepares it fresh each day. For cafés that compete on texture and consistency, protein that is already in the milk is a more reliable option.

The high-protein dairy options for coffee

Cafés now have four ways to offer higher-protein milk drinks.

• Whey-blended milk: Standard milk blended with whey isolate. Starbucks’ version adds 12-16 g of protein to a grande latte. The protein dose is high, but it requires an extra step and can affect texture in hot coffee.
• Ultrafiltered milk: Milk passes through a membrane under pressure, concentrating the protein while water, some lactose, and minerals pass through. It has more protein and less sugar than standard milk, with a familiar taste.
• Protein-fortified milk: Milk with added milk protein concentrate. Arla’s UK Protein semi-skimmed milk contains 5.5g of protein per 100ml, which Arla says is 53% more than standard semi-skimmed.
• Double milk: Milk with some water removed, which concentrates protein, fat, and natural sugars. It adds body and sweetness and improves foam structure. Because the sugars concentrate, it’s not a lower-sugar option.

What is double milk?

MILBOK, made by BeFood, is a key player in the double milk category. The concept resembles double cream: a richer, more concentrated form of single cream. Double milk is made by removing some water, without adding anything.

The idea began in barista competitions, where competitors concentrate their own milk to build sweetness, body, and mouthfeel. The most common method is freeze-distillation. Baristas freeze whole milk and let it melt slowly, so the water-rich portion drains away, roughly halving the volume. The World Barista Championship rules allow this, as long as the process uses no ingredients or additives.

“MILBOK’s double milk contains 5.5g of protein and 5g of fat per 100ml, against 3.2g and 3.5g in whole milk,” says Alex Shilov, marketing manager at MILBOK. “This is about 70% more protein than whole milk and about five times the protein of a typical barista oat drink.

“The only ingredient is cow’s milk, with no additives or powders. The process reduces 2 litres of milk to 1 litre, and all 8.6g of carbohydrate per 100ml comes from natural milk sugars.”

Visitors can taste double milk at upcoming European festivals: the Ljubljana Coffee Festival on 26 and 27 September, where MILBOK is a sponsor, the Prague Coffee Festival on 24 and 25 October, and Rotterdam Coffee Fest from 5 to 8 November.

The benefits of double milk

Beyond taste and texture, double milk offers nutritional benefits. 

“A 250ml serving of MILBOK contains roughly 14g of protein from the milk alone, the equivalent of two eggs,” Alex says. “Because protein is naturally part of the milk, the product steams like ordinary milk. We recommend steaming to 55°C to create a stable microfoam suitable for latte art. 

“The concentrated milk sugars also add natural sweetness, which can reduce the amount of syrup a drink needs,” Alex adds.

Consistency is another advantage. Handmade competition milk takes more than 10 hours to prepare and varies in taste between batches, whereas a commercial product delivers the same specification in every carton. Sealed cartons also keep for up to six months at room temperature (maximum 25°C), freeing fridge space and reducing waste. Once opened, MILBOK advises refrigerating double milk and using it within three days, so cafés should match carton sizes to their volumes.

This makes it more straightforward to build a premium beverage tier. A protein flat white or cappuccino offers a richer texture, and a dirty coffee benefits from denser milk to maintain a separate layer beneath the espresso. 

Beyond coffee

As demand for non-coffee drinks soars, even outpacing coffee at chains like Black Sheep and Blank Street, specialty cafés have an opportunity to expand the use of high-protein milks.

“Double milk works well in matcha lattes, tea lattes, and hot chocolate, and many cafés are looking for protein options across their whole milk-based menu, not only espresso drinks,” Alex says.

Matcha and hot chocolate in particular benefit from the extra body and sweetness. Both are naturally bitter, with matcha having grassy, hay-like flavour notes, so the concentrated sugar in double milk provides natural sweetness.

Protein is no longer limited to gyms and sports nutrition. Consumers now look for it in cereal and sodas, and coffee is the next place many expect to find it. Chains such as Starbucks have shown that customers will pay for protein options, while the growth in GLP-1 use suggests demand will continue. 

Specialty cafés can serve high-protein milks in different ways, and they should test options against their costs, customers, staff, and equipment before adding protein to their menus.

Enjoyed this? Then read our article on the dirty coffee.

Photo credit: MILBOK, Connor Houtman

Perfect Daily Grind

Please note: MILBOK is a sponsor of Perfect Daily Grind.

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