After eating a high-protein breakfast, people didn’t eat more protein later — they just ate less carbs and fat.

Scientific Claim

In healthy young professionals (n=13), a high-protein breakfast (30g protein, 350 kcal) does not significantly alter macronutrient selection beyond reducing carbohydrate and fat intake during ad libitum eating, indicating no compensatory increase in protein consumption.

Original Statement

“The consumption of the HP breakfast tended to decrease ad libitum food intake... through the reduction in ad libitum carbohydrate and fat intake.”

From study:A pilot study assessing whether the consumption of a protein‐rich breakfast improves appetite control, eating behavior, and sleep quality compared to skipping breakfast in healthy young professionals

Evidence Quality Assessment

Claim Status

appropriately stated

Study Design Support

Design supports claim

Appropriate Language Strength

definitive

Can make definitive causal claims

Assessment Explanation

The study explicitly attributes reduced intake to carbs and fats, and no increase in protein intake was reported. The claim is directly supported by the data and appropriately stated.

Evidence from Studies

Supporting (1)

A pilot study assessing whether the consumption of a protein‐rich breakfast improves appetite control, eating behavior, and sleep quality compared to skipping breakfast in healthy young professionals

Randomized Controlled Trial

Human

People who ate a high-protein breakfast ate less carbs and fat later in the day, but didn’t eat more protein — exactly what the claim says.

Contradicting (0)

No contradicting evidence found

Source Study

A pilot study assessing whether the consumption of a protein‐rich breakfast improves appetite control, eating behavior, and sleep quality compared to skipping breakfast in healthy young professionals

Score: 46

DOI: 10.1096/fasebj.31.1_supplement.443.1

Similar Assertions

People who eat a high-protein breakfast may eat about 420 fewer calories later in the day than those who skip breakfast, mostly because they eat less carbs and fat.

86%

When people eating a high-protein diet skip their planned meal and choose something with less protein, they tend to eat about 260 more calories that day.

83%

When people eat a meal with less protein than usual, they tend to eat more total calories that day — and this pattern holds up even when accounting for other factors.

80%

What you eat in one meal matters more for how many calories you eat that day than how hungry or full you feel.

79%

People can eat a lot more without feeling hungrier — meaning something other than hunger might be making them eat more.

77%