The Claim
β,β'-carotene-15,15'-oxygenase enzyme activity in the duodenum does not differ between cattle with yellow fat and cattle with white fat, indicating that intestinal metabolism of beta-carotene is not a primary determinant of differences in fat pigmentation.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Cattle with yellow fat and cattle with white fat have the same level of enzyme activity in their duodenum that breaks down beta-carotene, meaning differences in fat color are not primarily caused by how the intestine processes this compound.
See the scientific wording
β,β'-carotene-15,15'-oxygenase enzyme activity in the duodenum is similar between cattle with yellow and white fat, indicating that intestinal metabolism of beta-carotene is not a primary determinant of fat pigmentation differences.
Beta-carotene from food enters the bloodstream and travels to the liver, where an enzyme breaks it down into retinal. If this enzyme is active, little beta-carotene remains to reach fat tissue. If the enzyme is less active, beta-carotene builds up in fat and turns it yellow. The gut does not break down beta-carotene differently in yellow- and white-fat animals, so the liver's activity controls fat color.
What the research says
1 studyCows with yellow fat and cows with white fat have the same level of a gut enzyme that breaks down beta-carotene, so the difference in fat color isn't because of how their guts process it. The enzyme in their livers works differently, but that's not what the claim is about.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.