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In Summary
* A paper has been published, which claimed to show the effect of a single high-fat meal on blood flow.
* The subjects – 20 healthy men aged between 18 and 35 and 21 healthy men aged between 60 and 80 – were given a test meal. Four hours after this meal, blood tests were taken to measure glucose, insulin and triglycerides. Exercises to measure blood flow and blood pressure changes were also undertaken.
* The test meal was a milkshake comprising mostly heavy whipping cream, but also chocolate syrup, sugar, and powdered milk.
* The paper claimed that these were the first findings to demonstrate that raised blood fat, after a high-fat (predominantly saturated fat) meal, impairs both general vascular flow and blood flow to the brain.
* The issues with this paper stemmed from the test meal – the milkshake. It included all three macronutrients. It included all three natural fats. It included sugar. It included caffeine. It included an unnatural carb-fat combination not found in real food. It delivered intake in liquid (rapid) form. It contained a high number of calories and a higher fat proportion than any fast-food takeaway. The single high-fat meal description is thus correct, but it implied that fat was responsible for outcomes and we cannot say that it was.
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Zoe
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