Feeding hens corn oil for three years seemed to reduce artery damage more than feeding them no extra fat, even though their blood cholesterol didn’t change much — maybe the type of fat matters more than how much cholesterol is in the blood.

Scientific Claim

Prolonged feeding of 10% maize oil to laying hens for three years is associated with lower aortic atherosclerotic lesion scores compared to an unsupplemented diet, despite no significant difference in plasma cholesterol levels, suggesting unsaturated fats may inhibit intimal proliferative changes in avian vasculature.

Original Statement

“The hens receiving maize oil had the lowest atherosclerotic scores, which were not, however, significantly different from those of the group given animal fat... the lower scores associated with supplements of linseed oil or maize oil provide the consistent interpretation that unsaturated fats inhibit the development of proliferative aortic lesions.”

From study:Effect of prolonged feeding of differently saturated fats to laying hens on performance, blood pressure, plasma lipids and changes in the aorta

Evidence Quality Assessment

Claim Status

overstated

Study Design Support

Design supports claim

Appropriate Language Strength

association

Can only show association/correlation

Assessment Explanation

The study is non-randomized and observational in design, so it cannot prove causation. The authors use 'inhibit' — a causal verb — but only an associative relationship is supported by the data.

More Accurate Statement

“Prolonged feeding of 10% maize oil to laying hens for three years is associated with lower aortic atherosclerotic lesion scores compared to an unsupplemented diet, suggesting unsaturated fats may be linked to reduced intimal proliferative changes in avian vasculature.”

Evidence from Studies

Supporting (0)

No supporting evidence found

Contradicting (1)

Effect of prolonged feeding of differently saturated fats to laying hens on performance, blood pressure, plasma lipids and changes in the aorta

Cohort Study

Animal

1960

The study says it looked at whether maize oil affects chicken heart health over three years, but it doesn’t say what it found—so we can’t tell if the claim is true or false.

Source Study

Effect of prolonged feeding of differently saturated fats to laying hens on performance, blood pressure, plasma lipids and changes in the aorta

Score: 12

DOI: 10.1079/BJN19600058

Similar Assertions

Corn oil made the chickens’ blood and arteries richer in certain healthy fats, while animal fat made them poorer in those fats — but this had nothing to do with how much cholesterol was in their blood.

87%

Adding fat to the chickens’ diet didn’t change their blood pressure — so high blood pressure probably isn’t why their arteries got damaged.

82%

As chickens get older, their blood cholesterol goes up — but that doesn’t tell you how bad their artery damage is. You need to watch them for years to really understand how diet affects their arteries.

82%

Hens fed animal fat died more often, had more cholesterol in their blood and arteries, but surprisingly had less visible artery damage than hens fed no extra fat — meaning more fat in the arteries doesn’t always mean worse damage.

81%

In chickens, the lower part of the main artery has more cholesterol and more damage than the upper part — and how bad the damage is in each bird is linked to how much cholesterol is in that specific spot, not how much cholesterol is in the whole body.

72%