Hydrolysed soy protein and amino acid transport across gut cells
What it found
Partially hydrolysed soy protein moved 32% more amino acids across lab-grown gut cells than regular soy protein.
This was tested in cell cultures, not in people.
What they found
Animal and lab studies
More amino acids transported
In lab-grown gut cells, the broken-down soy protein let 32% more amino acids pass through on average compared to regular soy protein.
Biggest differences seen
The largest increases in transport were for three specific amino acids: histidine, lysine, and valine. These were measured in cell cultures.
Other findings
Larger production batches
Making the broken-down soy protein on a larger scale did not reduce its ability to move more amino acids across the cells.
What the authors conclude
- They say their results support the idea that broken-down soy protein moves amino acids across the gut lining faster than whole soy protein.
- They suggest this could matter when the body needs amino acids quickly, such as for building muscle.
How it was done
Some suggest that broken-down proteins help build muscle faster than whole proteins by delivering amino acids to muscles more quickly. The authors wanted to see if this held true for soy protein at the gut level.
They compared regular soy protein with partially broken-down soy protein using lab-grown human gut cells. Both forms went through a simulated digestion process first. They measured how many amino acids passed through the cell layer after 3 hours.
What it can’t tell you
- We summarised it from the abstract only.
- These tests used lab-grown gut cells, so they cannot show what happens inside a living person's body.
- The study measured movement across cells, not actual muscle growth or health effects in people.
The paper
- Title
- Partially hydrolyzed soy protein shows enhanced transport of amino acids compared to nonhydrolyzed protein across an intestinal epithelial cell monolayer
- Type
- Study
- Evidence
- Animals and lab studies
- Summarised from
- Abstract only
- Cite
- McGraw NJ, Napawan N, Toland MR, Schulze J, Tulk BM, Krul ES (2014). Partially hydrolyzed soy protein shows enhanced transport of amino acids compared to nonhydrolyzed protein across an intestinal epithelial cell monolayer. Journal of food science. doi:10.1111/1750-3841.12553PubMed 25040304DOI
Summary written 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error