文档介绍：Trans Fats – the UGLY Fat
Presented by:
Dr. Christine Simpson
CHIP Alumni - June 20, 2006
Walter C. Willett, MD
“Only one type of dietary fat is worse for you than saturated fat---the mon trans fat.”
“...thirty thousand or more premature heart disease deaths each year” are “due to trans fats in our food supply.”
Chairman of Dept of Nutrition,
Harvard School of Public Health &
Professor of Medicine, Harvard Medical School
Eat, Drink, and Be Healthy, pp 71, 73
What are fatty acids?
Chains of carbon atoms with hydrogen atoms attached
The important way fatty acids differ:
degree of saturation = how many hydrogen atoms the carbon chains carry
saturated fatty acids
monounsaturated fatty acids
polyunsaturated fatty acids
Saturated fatty acid
Fully loaded with hydrogen atoms
Only single bonds between carbon atoms
Straight molecule, stiff, pack together
Examples:
Animal-based fats (meat and dairy)
Solid plant-based fats, such as coconuts,
palm fats, etc.
In general, saturated fats tend to increase the risk of heart disease (raise LDL levels, but also raise HDL levels)
Monounsaturated fatty acid
One pair of hydrogen atoms missing
One double bond between carbons
Hydrogen on same side of double bond = cis configuration
Bent molecule, flexible, not pack together
Examples:
Olive oil
Canola oil
Avocado
In general, monounsaturated fats tend to lower the risk of heart disease when consumed in moderate amounts.
Polyunsaturated fatty acid
Two or more pairs of hydrogen atoms missing
Two or more double bonds between carbons
Hydrogen on same side of double bond = cis configuration
Bent molecule, more flexible, not pack together
Examples:
(these include the omega-3’s and 6’s)
Corn oil
Sunflower oil
Soybean oil
Canola oil
Flaxseed oil
Hemp seed oil
In general, polyunsaturated fats tend to lower the risk of heart disease when consumed in moderate amounts.