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Strong Support

causal

History

In healthy women aged approximately 28 years, a 180-kcal nutrition bar with 2 grams of added leucine peptide increases feelings of fullness after eating and reduces the desire to eat more later,...

Pro

Against

Mechanism

Synthesis from 1 study

How it works

Leucine peptide in the meal gets absorbed and tells special gut cells to send a fullness signal to the brain, making people feel satisfied and less hungry. This happens even when the meal has the same calories and protein as a meal without leucine, meaning leucine itself triggers the feeling of...

Most probable mechanism

In Simple Terms

When leucine peptide is eaten, it gets absorbed into the blood and triggers special cells in the gut to send fullness signals to the brain, making a person feel satisfied and less inclined to eat more, even though the meal has the same calories and protein as a meal without leucine.

Causal chain

Leucine peptide is digested and absorbed, increasing plasma leucine concentration in a dose-dependent manner

Verified by multiple studies

which leads to

Elevated plasma leucine activates nutrient-sensing receptors (e.g., mTOR or CaSR) on enteroendocrine L-cells in the intestinal lining

Indirect evidence only

which leads to

Activated L-cells release satiety hormones (e.g., GLP-1 or other unidentified peptides) that signal to the brainstem and hypothalamus

Indirect evidence only

which leads to

Satiety signals suppress orexigenic neural circuits in the hypothalamus, reducing hunger and prospective food consumption

Supported by evidence

Less supported by current evidence, but not ruled out

In Simple Terms

Leucine in the gut may directly activate nerve fibers that connect the gut to the brain, sending a fullness signal without involving hormones.

Causal chain

Leucine peptide is absorbed and interacts with leucine-sensitive receptors on vagal afferent nerve endings in the intestinal wall

Not yet directly tested

which leads to

Activated vagal afferents transmit signals to the nucleus tractus solitarius in the brainstem

Not yet directly tested

which leads to

Brainstem integration reduces activity in appetite-promoting regions of the hypothalamus

Not yet directly tested

Evidence from Studies

Supporting (1)

Community contributions welcome

Consuming Lower-Protein Nutrition Bars with Added Leucine Elicits Postprandial Changes in Appetite Sensations in Healthy Women.

Randomized Controlled Trial

Human

2018 May 1

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

Consuming Lower-Protein Nutrition Bars with Added Leucine Elicits Postprandial Changes in Appetite Sensations in Healthy Women.

Score: 59

DOI: 10.1093/jn/nxy023

Similar Assertions

A nutrition bar with 2 grams of leucine peptide increases feelings of fullness after eating by 14.2% compared to a similar bar without leucine peptide in healthy women.

84%

Consuming a nutrition bar with 3 grams of leucine peptide raises plasma leucine levels by 260% compared to a bar with no leucine peptide in healthy women, but does not increase feelings of fullness.

81%

A nutrition bar with 11 grams of protein and 2 grams of leucine peptide produces the same level of fullness after eating as a bar with 13 grams of protein and 3 grams of leucine peptide in healthy women.

80%

When total protein intake is low, meals with added leucine lead to a greater decrease in feelings of hunger than meals with different amino acid profiles.

79%

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.

79%