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Strong Support

causal

History

In normal-weight obese women, eating soy-enriched high-protein snacks for six months reduces self-reported hunger by 12 millimeters on a standard scale, while eating fruit snacks does not change...

Pro

Against

Mechanism

Synthesis from 1 study

How it works

Soy protein triggers the gut to release signals that tell the brain you're full, which makes you feel less hungry and eat less. Building more muscle from soy may also help burn more calories over time, but the main reason you feel fuller is the gut-brain communication.

Most probable mechanism

In Simple Terms

Eating soy protein triggers the gut to release hormones that signal fullness to the brain, which reduces hunger and leads to eating less.

Causal chain

Soy protein digestion releases essential amino acids, particularly leucine, into the bloodstream

Supported by evidence

which leads to

Amino acids stimulate enteroendocrine cells in the small intestine to secrete cholecystokinin, glucagon-like peptide-1, and peptide YY

Supported by evidence

which leads to

These satiety hormones activate vagal nerve pathways and circulate to the hypothalamus and brainstem

Supported by evidence

which leads to

Ghrelin secretion from the stomach decreases in response to protein ingestion

Supported by evidence

which leads to

Neural and hormonal signals reduce hunger drive and increase perceived fullness in the brain

Supported by evidence

which leads to

Reduced hunger leads to lower spontaneous food intake and decreased subjective appetite

Verified by multiple studies

Less supported by current evidence, but not ruled out

In Simple Terms

Soy protein builds muscle, which increases energy use and may reduce hunger over time.

Causal chain

Essential amino acids from soy protein activate the mTORC1 signaling pathway in skeletal muscle

Supported by evidence

which leads to

mTORC1 activation increases muscle protein synthesis and leads to net accumulation of skeletal muscle mass

Verified by multiple studies

which leads to

Increased muscle mass raises resting metabolic rate and energy expenditure

Indirect evidence only

which leads to

Elevated energy expenditure alters energy balance signals, reducing appetite over time

Not yet directly tested

Evidence from Studies

Supporting (1)

Community contributions welcome

Effects of 6 Months of Soy-Enriched High Protein Compared to Eucaloric Low Protein Snack Replacement on Appetite, Dietary Intake, and Body Composition in Normal-Weight Obese Women: A Randomized Controlled Trial

Randomized Controlled Trial

Human

2021 Jun 30

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

Effects of 6 Months of Soy-Enriched High Protein Compared to Eucaloric Low Protein Snack Replacement on Appetite, Dietary Intake, and Body Composition in Normal-Weight Obese Women: A Randomized Controlled Trial

Score: 68

DOI: 10.3390/nu13072266

Similar Assertions

In normal-weight obese women with over 30% body fat, swapping a daily fruit snack for a 50-gram soybean-based high-protein snack for six months results in a 3.7% reduction in body fat, a 4.3 cm decrease in waist size, a 1.2 kg increase in muscle mass, a 166 kcal reduction in daily calorie intake, and a 12 mm drop in self-reported appetite.

88%

In normal-weight obese women, switching from a daily fruit snack to a soy-enriched high-protein snack results in a reduction of 166 kilocalories and 58.4 grams of carbohydrates per day over six months, while women who continued eating fruit snacks increased their daily energy intake by 91 kilocalories.

79%

In normal-weight obese women consuming less than 1 gram of protein per kilogram of body weight daily, switching from a fruit snack to a soy-enriched high-protein snack for six months results in an increase of 23.5 grams of protein per day and 0.4 grams of protein per kilogram of body weight per day, accompanied by a 1.2 kilogram increase in skeletal muscle mass and a 3.7 percent decrease in body fat percentage.

78%

Among normal-weight women with obesity and low protein intake, consuming soy-enriched high-protein snacks for six months leads to a 1.2 kg gain in skeletal muscle mass, while consuming fruit snacks with low protein leads to a 0.3 kg gain.

77%

Other studies have found mixed results when testing protein snacks, meaning the effect isn’t always the same—it depends on what kind of snack and who’s eating it.

71%