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You must be aware that current studies show trans fat lowers good cholesterol (HDL) which saturated fat does not do. Also, trans fat reduces blood vessel function. Trans fat is an unnatural processed fat and should not be recommended over natural saturated fat. Saturated fat is recommended at 10% of daily intake. Trans fat intake is recommended to be zero.
http://www.health.gov/dietaryguidel.../pdf/2kdiet.pdf
Dietary Guidelines for Americans:
Advice For Today
To reduce your intake of saturated fat and cholesterol,
Limit use of animal fats, hard margarines (unless labeled
trans fatty acid free), and partially hydrogenated
shortenings. Use vegetable oils as a substitute.
http://vm.cfsan.fda.gov/~dms/labtrans.html
National Academy of Sciences, Institute of Medicine,
Letter Report on Trans Fatty Acids
Coronary Heart Disease
Similar to saturated fatty acids, there is a positive linear trend between trans fatty acid intake and LDL cholesterol concentrations (Judd et al., 1994; Lichtenstein et al., 1999; Zock and Katan, 1992). Some evidence also suggests that trans fatty acids result in lower HDL cholesterol concentrations (Table 6). Hence, the net result is a higher total cholesterol (or LDL cholesterol):HDL cholesterol ratio (Judd et al., 1994; Lichtenstein et al., 1999; Zock and Katan, 1992). This finding, combined with data from prospective cohort studies (Ascherio et al., 1996;
Gillman et al., 1997; Hu et al., 1997; Pietinen et al., 1997; Willett et al., 1993) (Table 6), has lead to the concern that dietary trans fatty acids are more deleterious with respect to coronary heart disease than saturated fatty acids (Ascherio et al., 1999).
Summary
There is a positive linear trend between trans fatty acid intake and total and LDL cholesterol concentration, and therefore increased risk of CHD, thus suggesting a Tolerable Upper Intake
Level (UL) of zero.
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Dear Ms. Hunt:
I am the editorial director for Women's Health Interactive (WHI). I received your helpful visitor feedback on trans fatty acids, and wanted to thank you and let you know that we are revising that section of the Nutrition Center. The information you provided was most helpful and educational, and WHI registrants will definitely benefit from the update on our site.
Thank you again for your interest in WHI, and for the time and effort you devoted to providing us with accurate information.
Alison Harkin
WHI Editorial Director