"What Just One High-Saturated-Fat Meal Can Do"
A small but apparently significant study, published in the August 15th, 2006 Journal of the American College of Cardiology, shows that eating just one high-saturated-fat meal can hinder the ability of HDL or "good" cholesterol from protecting against clogged arteries.
Fourteen healthy Australian volunteers between the ages of 18 and 40 were fed two special meals one month apart. Each meal comprised a slice of carrot cake and a milkshake. But one of the meals was high in saturated fat (made with coconut oil) while the other was high in polyunsaturated fat (using safflower oil). Neither the researchers nor the participants knew which meal was eaten during which visit. The meals were prepared so that each volunteer ate 1 gram of fat per kilogram (2.2 pounds) of body weight—roughly the equivalent of a double cheeseburger, large fries and a large milkshake for a 150-pound person.
Three hours after eating the saturated-fat cake and shake meal, the artery linings were unable to expand sufficiently to increase blood flow to the body’s tissues and organs. The arteries showed some reduced ability after the polyunsaturated meal, but these results were deemed not statistically significant.
After six hours, researchers noted that the anti-inflammatory qualities of HDL cholesterol were reduced after eating the saturated-fat meal, whereas they improved after eating the polyunsaturated meal.
It’s long been thought that diets high in saturated fat tend to clog our arteries with plaque, putting us at increased risk of heart attack and stroke. If this is what one meal can do in a few hours, imagine what a lifelong diet of high-saturated-fat food will do. This study seems to show not only that the negative effects of eating certain fats is more immediate than we thought, but also that the positive effects of HDL cholesterol in our bodies is dependent on other factors. And for those who promote coconut oil as a healthier kind saturated fat, since it’s a plant-based saturated fat, this study may be a setback"