IT’S A MODERN paradox. Open your feed and somebody is praising ultra-processed protein for helping people hit their goals. A few swipes later, somebody else is warning that processed foods are wrecking our health. So yes, the messaging is messy.
That confusion got even louder after a study in Radiology linked diets high in ultra-processed foods to more fat inside thigh muscles. Naturally, folks started wondering whether ultra-processed protein is actually working against their wellness goals. The short answer: it is not that simple.
To get some clarity, it helps to separate fear-based headlines from what the research actually says and what nutrition experts are seeing in real life.
First, About That Study…
AS IT TURNS out, the Radiology study did not separate ultra-processed high-protein foods from other kinds of ultra-processed foods. That matters a lot. Participants could have been eating protein bars, but they also could have been eating plenty of high-fat, high-carb snack foods too. On top of that, the average participant was around 60 years old, so this was not a broad snapshot of everybody.
Stuart Phillips, PhD, a protein researcher and professor of kinesiology at McMaster University, does not see evidence that every ultra-processed protein source should be blamed for poorer muscle quality.
His basic point is clear: poor overall diet quality is more likely the issue, not the idea that every ultra-processed food automatically harms your muscles.
Even with the study’s limits, the bigger question still feels real for a lot of people: if a meaningful chunk of your protein comes from bars, shakes, or powders, are you still on track?
Are You Still Making Gains if Most of Your Protein is Ultra-Processed?
ACCORDING TO PHILLIPS, muscle building comes down mostly to getting enough protein overall and making sure the amino acid profile is solid.
If the dose is right, the amino acids are there, and your total intake across the day is adequate, the level of processing matters much less for muscle protein synthesis. In other words, a whey isolate is not the same thing as a random junk food just because both might land in the same ultra-processed category.
That category comes from the NOVA system, which groups foods by how processed they are. Protein powders, shakes, and bars often end up labeled ultra-processed under that system.
One key detail is leucine, an essential amino acid that helps drive muscle protein synthesis. Your body is focused on getting that amino acid, not judging whether it came from a supplement or a plate of food. If you are choosing a packaged protein product, it is smart to look for one that includes leucine or comes from high-quality protein sources. Whole-food options like meat, soy foods, dairy, lentils, and salmon can also do that job well.
Daily total protein matters too. There is a lot of noise online about huge protein targets, but Phillips’ research suggests there is a point where adding more does not deliver much extra benefit. For many healthy people, that level is about 1.6 grams of protein per kilogram of body weight per day.
That number is not a one-size-fits-all commandment. Younger people doing resistance training may benefit from aiming there, while adults over 65 may do well somewhere between 1.2 and 1.6 grams per kilogram per day. Your goals, training style, health history, and stage of life all matter.
There is also room for flexibility. Some older lifters and people training hard can push closer to 2.0 grams per kilogram without harm, but the payoff tends to level off.
The bigger picture is balance. Whole foods are still the best foundation for most people. But real life is real life. Busy schedules, budget limits, recovery needs, and convenience all shape how we eat. That does not make someone lazy or less committed. It just means protein bars and powders can be useful tools when needed.
So no, you do not need to panic over every processed gram of protein. Focus on consistency, variety, and overall quality. That approach will usually take you much farther than internet food fear ever will.
Abby Langer, RD is the owner of Abby Langer Nutrition, a Toronto-based nutrition consulting and communications company
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