Identify and reduce protein-diluted foods

Recognize ultra-processed foods by their low protein-to-calorie ratio — the profile that keeps you eating past fullness.

Why it works

Ultra-processed foods are typically engineered to be hyperpalatable while being low in protein relative to calories — a profile Raubenheimer and Simpson call "protein dilution." The brain’s protein appetite pushes consumption higher to compensate, driving passive overconsumption of energy. Recognizing this design characteristic makes the food environment legible rather than mysterious.

How to do it

1. Check the protein percentage on foods you eat regularly: below 15% protein by calories is a warning sign.
2. Identify the top two or three low-protein high-palatability foods in your routine.
3. Substitute or pair them with a higher-protein option rather than eliminating cold turkey.
4. Over time, shift the environment so protein-dense foods are the default, not the effortful choice.

Evidence

Observational evidence links ultra-processed food consumption to greater energy intake; the protein-dilution framing is a mechanistic explanation consistent with multiple controlled feeding studies. A randomised experiment diluting dietary protein in lean humans directly tested the leverage prediction, showing that lower protein density drives compensatory increases in total energy intake. (observational)

Hall et al. is a controlled inpatient study — highly informative but only two weeks long; whether protein dilution is the primary driver versus other food characteristics remains debated.

Sources

• Hall et al. (2019), ultra-processed diets cause excess calorie intake, Cell Metabolism
• Hall KD, Ayuketah A, Brychta R, Cai H, Cassimatis T, Chen KY, et al. Ultra-processed diets cause excess calorie intake and weight gain: an inpatient randomized controlled trial of ad libitum food intake. Cell Metabolism. 2019;30(1):67-77.e3.
• Gosby AK, Conigrave AD, Raubenheimer D, Simpson SJ. Protein leverage and energy intake. Obesity Reviews. 2014;15(3):183-191.
• Gosby AK, Conigrave AD, Lau NS, Iglesias MA, Hall RM, Jebb SA, Brand-Miller J, Caterson ID, Raubenheimer D, Simpson SJ. Testing protein leverage in lean humans: a randomised controlled experimental study. PLoS ONE. 2011;6(10):e25929.

Common mistake

Focusing on calorie counts or fat content on labels while ignoring protein percentage — a food can be "low fat" and still be protein-diluted in a way that drives hunger.