In middle-to-older aged adults, adding 0.13 grams of whey or pea protein per kilogram of body weight to a low-protein breakfast results in the same short-term reduction in hunger and increase in...

Pro

Against

Mechanism

Synthesis from 1 study

How it works

When protein is eaten, amino acids enter the blood and trigger nerves in the gut to tell the brain the body is full. This happens quickly and makes hunger drop for a few hours, no matter if the protein comes from whey or peas.

Most probable mechanism

In Simple Terms

When protein is eaten, amino acids quickly enter the bloodstream and activate sensors in the gut that send signals to the brain, making a person feel less hungry and more full for a few hours.

Causal chain

Whey and pea protein are rapidly digested in the small intestine, releasing free amino acids into the portal circulation.

Verified by multiple studies

which leads to

Elevated plasma amino acid concentrations activate L-amino acid sensors on enteroendocrine cells and vagal afferent nerve terminals in the intestinal wall.

Supported by evidence

which leads to

Activated vagal afferents transmit signals to the nucleus tractus solitarius in the brainstem, which integrates satiety signals and reduces hunger drive.

Supported by evidence

which leads to

This neural pathway suppresses subjective hunger and increases fullness and satiety within 30 to 180 minutes after ingestion, independent of ghrelin or GLP-1 concentration changes.

Verified by multiple studies

Evidence from Studies

Supporting (1)

Community contributions welcome

Postprandial plasma amino acid and appetite responses to a low protein breakfast supplemented with whey or pea protein in middle-to-older aged adults

Randomized Controlled Trial

Human

2025 Feb 11

Contradicting (0)

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Postprandial plasma amino acid and appetite responses to a low protein breakfast supplemented with whey or pea protein in middle-to-older aged adults

Score: 64

DOI: 10.1007/s00394-025-03605-0

Similar Assertions

In middle-to-older adults, eating a low-protein breakfast with 0.13 grams of whey or pea protein per kilogram of body weight temporarily lowers the hunger hormone ghrelin and raises the satiety hormone GLP-1, but does not change self-reported feelings of hunger, fullness, or overall appetite over three hours.

94%

When middle-to-older adults eat a low-protein breakfast and add either whey or pea protein powder at 0.13 grams per kilogram of body weight, both types of protein raise essential amino acids and appetite hormones by the same amount, and neither affects hunger or fullness more than the other.

89%

Eating a breakfast with 30 grams of protein reduces hunger and triggers satiety hormones equally in young adults and older adults.

83%

In adults around 74 years old, eating a leucine-enriched protein bar after a low-protein breakfast reduces hunger for six hours as much as eating a 32-gram high-protein meal and more than eating a 13-gram low-protein meal.

82%

In middle-to-older adults, eating a low-protein breakfast with 0.13 grams of whey or pea protein per kilogram of body weight does not change blood sugar or insulin levels compared to before eating.

81%