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Strong Support
mechanistic
Analysis v3
History

Eating a diet where 30% of calories come from protein increases feelings of fullness, even when blood levels of the hormone leptin remain unchanged, showing that leptin is not responsible for this...

59
Pro
0
Against

Mechanism

Synthesis from 1 study

How it works

When you eat more protein, your gut releases hormones that tell your brain you're full. These hormones work even when your body's fat-storage signal (leptin) doesn't change, so your hunger goes down without needing leptin to rise.

Most probable mechanism

In Simple Terms

Eating more protein causes the gut to release more fullness hormones, which signal the brain to reduce hunger and food intake, even when the fat-storage hormone leptin stays the same.

Causal chain
1

Dietary protein intake increases to 30% of total energy intake

Verified by multiple studies
which leads to
2

Amino acids from digested protein stimulate enteroendocrine cells in the small intestine to secrete glucagon-like peptide-1 (GLP-1) and peptide YY (PYY)

Supported by evidence
which leads to
3

Elevated GLP-1 and PYY levels activate vagal afferents and directly bind to receptors in the hypothalamus and brainstem

Supported by evidence
which leads to
4

Neural and hormonal signals from the gut suppress activity in hunger-promoting neurons in the arcuate nucleus and enhance activity in satiety-promoting neurons

Supported by evidence
which leads to
5

Plasma leptin concentrations decrease due to reduced adipose tissue mass, but central leptin sensitivity does not increase sufficiently to account for the observed satiety

Supported by evidence
which leads to
6

Satiety signaling overrides homeostatic hunger drives, leading to reduced spontaneous food intake and negative energy balance

Verified by multiple studies

Evidence from Studies

Supporting (1)

59

Community contributions welcome

59

A high-protein diet induces sustained reductions in appetite, ad libitum caloric intake, and body weight despite compensatory changes in diurnal plasma leptin and ghrelin concentrations

Randomized Controlled Trial
Human

Contradicting (0)

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.

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Source Study

A high-protein diet induces sustained reductions in appetite, ad libitum caloric intake, and body weight despite compensatory changes in diurnal plasma leptin and ghrelin concentrations

Score: 59
DOI: 10.1093/ajcn/82.1.41

Similar Assertions

Different protein sources suppress appetite to different degrees based on how much leucine they contain.

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On a high-protein diet where people eat without calorie limits, body weight and fat mass still decrease even though hormones that regulate hunger and fullness change in ways that would typically promote weight gain.

59
0
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In adults with type 2 diabetes, eating a diet lower in carbohydrates and higher in protein is associated with higher reported feelings of fullness, increasing subjective satiety by 18% and peak satiety by 10%, even when body weight and total calorie intake remain unchanged.

54
0
76%

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.

67
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75%

Eating more protein makes you feel fuller for longer, so you’re less likely to snack or eat too much later.

20
0
74%