Whey protein and 'proteinmaxxing': how a dairy byproduct became a boom

Not long ago, whey was something cheesemakers had to get rid of. The thin, watery liquid left over when milk curdles into cheese was a disposal problem, sometimes spread on fields or fed to pigs. Today, as the Guardian reports, that same byproduct is the centrepiece of a booming global market for protein, driven by a trend the paper describes as 'proteinmaxxing' — a push to squeeze extra protein into as many meals and snacks as possible.

Whey protein is what remains after the liquid whey is filtered and dried into a powder. It is a complete protein, meaning it contains all the essential amino acids the body cannot make on its own, and it is absorbed relatively quickly. Those qualities made it popular first with bodybuilders and athletes, and later with a much broader public now adding it to shakes, yoghurts, baked goods and even coffee.

The commercial story is striking. A material once treated as waste has become a valuable ingredient, with dairy companies building the recovery and processing of whey into their business models. Protein-fortified versions of everyday products — from cereal to ice cream — now fill supermarket shelves, often carrying a price premium justified by their protein content, according to the Guardian's account of the market.

Behind the boom is a cultural shift in how people think about food. Protein has acquired a health halo, associated with muscle, satiety and fitness, while carbohydrates and fats have at times been cast as suspect. Social media has amplified the message, with influencers promoting high-protein eating as a route to a leaner, stronger body, and 'proteinmaxxing' as an aspirational goal.

So how much protein do people actually need? Standard dietary guidelines in many countries suggest around 0.8 grams per kilogram of body weight per day for the average adult, though some researchers argue that older adults and very active people benefit from more. For most people eating a varied diet, hitting the recommended amount from ordinary foods is achievable without supplements.

That is the crux of the scientific caution. There is good evidence that adequate protein matters, especially for preserving muscle as people age and for recovery after exercise. But there is far less support for the idea that piling protein far beyond one's needs delivers extra benefit for a typical healthy adult, and the body cannot store surplus protein for later use in the way it stores fat.

Whey itself is generally considered safe for healthy people, and it can be a convenient way to top up intake for those who struggle to get enough — older adults with small appetites, for instance, or people recovering from illness. The concerns raised by nutrition experts tend to be less about whey being harmful and more about cost, unnecessary consumption and the marketing that surrounds it.

There are groups for whom caution is warranted. People with kidney disease are often advised to monitor protein intake, and anyone with a milk allergy should avoid whey, though those with lactose intolerance may tolerate certain purified forms. As with any supplement, individual circumstances matter, and a doctor or dietitian can advise where there is doubt.

The protein craze also raises questions the Guardian's reporting touches on beyond individual health, including how demand reshapes the dairy industry and what it means for pricing and sustainability when a former waste stream becomes a sought-after commodity. A byproduct's transformation into a premium product is a case study in how food trends can reorganise supply chains.

For the individual reader, the practical takeaway is measured. Protein is important, and whey is a legitimate, convenient source of it. But most people meeting a balanced diet already get enough, and 'proteinmaxxing' well beyond one's needs is more likely to lighten a wallet than transform a body. As ever, whole foods, variety and matching intake to actual activity levels remain the sensible foundation.