Consumption of food containing trans-fat has unequivocally been shown to increase the risk of heart disease by raising levels of LDL (bad cholesterol), and lowering levels of HDL (good cholesterol).
Why do the nutrition labels on some products say that there are no trans fats, while Fooducate insists there are?
Unfortunately there is an FDA loop hole here. If the amount of trans-fat in a product is less than half a gram per serving, manufacturers can round it down to 0.
But even 0.49 grams of trans-fat is bad for you. And don't even get us started on the actual consumption versus the tiny serving size.
So how do you know if a product does have trans fat in it?
Look for "partially hydrogenated" oils and fats in the ingredient list.
Mensink RPM, Katan MB. Effect of dietary trans fatty acids on high-density and low-density lipoprotein cholesterol levels in healthy subjects. N Engl J Med 1990;323:439-45.
Zock PL, Katan MB. Hydrogenation alternatives: effects of trans fatty acids and stearic acid versus linoleic acid on serum lipids and lipoproteins in humans. J Lipid Res l992;33:399-4l0.
Judd JT, Clevidence BA, Muesing RA, Wittes J, Sunkin ME, Podczasy JJ. Dietary trans fatty acids: effects of plasma lipids and lipoproteins of healthy men and women. Am J Clin Nutr 1994;59:861-8.
Lichtenstein AH, Ausman LM, Jalbert SM, Schaefer EJ. Effects of different forms of dietary hydrogenated fats on serum lipoprotein cholesterol levels. N Engl J Med 1999;340:1933–1940
Hu FB, Stampfer MJ, Manson JE, Rimm E, Colditz GA, Rosner BA, et al. Dietary fat intake and the risk of coronary heart disease in women. N Engl J Med. 1997;337:1491–9.
Mozaffarian D, Katan MB, Ascherio A, Stampfer MJ, Willett WC. Trans fatty acids and cardiovascular disease. N Engl J Med. 2006;354:1601–1613.