For decades, most of us got our protein from unremarkable, whole foods: meat, eggs, dairy, beans. But over the past twenty years — fuelled by gym culture, keto, and the promise of effortless body recomposition — protein has become a marketing obsession.
Today, supermarket shelves are crowded with “high-protein” versions of bread, yoghurt, cereal, shakes — even cakes, crisps, and beer. These products command a premium price and have helped drive the UK’s sports nutrition market to an estimated £1.1 billion. The implication is clear: more protein equals better health.
But does it?
A new Channel 4 documentary, Protein: Everything You Need to Know, exposes the rise of “protein-washing” — a marketing tactic in which everyday foods are branded as “high” or “added protein” despite containing only marginally more protein than their standard, much cheaper equivalents. In some cases, the label disguises something more concerning: ultra-processed products bulked out with refined protein isolates, emulsifiers, flavourings, and sweeteners to mask their naturally bitter taste.
Protein is essential — but the story we’re being sold about it is increasingly distorted.
“Protein does far more than build muscle,” explains Dr Jack Mosley, GP registrar and consultant on the documentary. “It’s present in every cell of the body. It’s required for tissue repair, enzymes, hormones, immune function, and transport systems.”
It is also the most satiating of the three macronutrients, meaning it helps regulate appetite, preserve lean muscle mass, and support bone density as we age.
No wonder demand has surged. And no wonder food manufacturers have rushed to capitalise.
Gemma Atkinson, the broadcaster and fitness influencer who presents the documentary, admits she fell for the narrative herself. “I assumed that if something had extra protein, it was automatically healthier,” she says. “I’d choose a protein bar over dark chocolate because I thought I was making the better choice.”
What she discovered was sobering.
To legally qualify as “high-protein”, only 20 per cent of a product’s calories need to come from protein. Some manufacturers reach that threshold not by meaningfully increasing protein content, but by stripping out fats or carbohydrates instead. The result is a statistical win — not a nutritional one.
One “high-protein” loaf examined in the programme cost 37.5 per cent more than regular bread yet contained just one additional gram of protein per 100g. A “high-protein” yoghurt had less protein than a standard version making no such claim. A protein flapjack contained as much sugar and as many calories as a glazed Krispy Kreme doughnut. And a packet of “protein chips” contained no potato at all — only processed protein and starch.
“If the first ingredient is emulsifiers,” Atkinson says, “you’re not eating a high-protein snack. You’re eating an ultra-processed one.”
This matters because protein quality — not just quantity — is critical. Whole food proteins come packaged with micronutrients, fibre, fats, and bioactive compounds that influence digestion, muscle protein synthesis, and metabolic health. Highly processed protein isolates do not. In fact, emerging research suggests that diets high in ultra-processed foods — regardless of macronutrient profile — are associated with increased risk of obesity, cardiovascular disease, and metabolic dysfunction.
Which brings us to the uncomfortable question: how much protein do we actually need?
UK guidelines recommend around 0.75g of protein per kilogram of bodyweight per day — roughly 54g for women and 63g for men of average weight. According to the British Nutrition Foundation, most adults already exceed this amount.
“For sedentary adults, simply increasing protein intake isn’t necessary,” says Dr Mosley. “However, as we age, muscle becomes less responsive to protein — a phenomenon known as anabolic resistance. Older adults, particularly over 65, may benefit from slightly higher intakes, but only when combined with resistance training.”
More protein alone does nothing. Excess intake is broken down and excreted. Worse, when protein crowds out other nutrients — especially fibre — it can actively harm long-term health.
“Problems arise when protein dominates the diet,” Mosley explains, “displacing plant foods, fibre, and micronutrients. High intakes of red and processed meat are consistently linked to increased risks of cardiovascular disease, cancer, and type 2 diabetes.”
And fibre is where the modern diet is truly failing.
Around 90 per cent of the population does not meet the recommended 30g of fibre per day — a shortfall associated with higher risks of bowel cancer, heart disease, and poor metabolic health. Ultra-processed “protein-enhanced” foods often worsen this problem by removing fibre to improve shelf life and texture.
“Everyone’s talking about protein,” Atkinson notes, “but no one’s talking about fibre — and that’s where the real deficit is.”
Since filming the documentary, she says she now ignores front-of-pack claims and reads ingredient lists instead. Her diet centres on whole foods — things that “roam or grow” — with the occasional high-quality protein shake when time is tight. Dr Mosley agrees this is a pragmatic approach, but stresses that protein is not a magic lever.
The message is simple, but easily forgotten: protein is essential, processed protein is not. A healthy diet is not built on fortified shortcuts and marketing buzzwords, but on balance, context, and food in its least manipulated form.
If a product needs to shout about its protein content, it’s worth asking why.
Protein: Everything You Need to Know is on Channel 4 on Monday January 5 at 8pm
