Wednesday, January 17, 2007

You Can't Fool Mother Nature

Last month I took quite a beating in email when I posted Big Brother Takes Job as Short-Order Cook.

In it I questioned what restaurantuers would replace industrial trans-fats with, and provided a short list of contenders being promoted in the marketplace. I also said "I'd bet that this government-enforced decline in trans fat consumption in restaurants will be matched by something as just as bad, if not worse (considering our apriori obsession with total dietary fats and condemnation of dietary saturated fat), although we'll feel good that we're not allowing any appreciable trans-fats to be served to anyone eating in a New York this time around, and we'll continue to be ever-vigilant about those dreaded saturated fats because we can be sure the watchdogs will be out in force to make sure no one uses them to replace partially hydrogenated fat in food preparation!"

On things like this, I hate being right.

Just released yesterday: New fat, same old problem with an added twist?

Study shows a new fat replacement for trans fat raises blood sugar in humans

Waltham, MA -- Last month, New York City outlawed the use of partially hydrogenated oils, known as trans fats, in restaurants, a ban now under consideration in other cities, including Boston and Chicago. But novel research conducted in Malaysia and at Brandeis University shows that a new method of modifying fat in commercial products to replace unhealthy trans fats raises blood glucose and depresses insulin in humans, common precursors to diabetes. Furthermore, like trans fat, it still adversely depressed the beneficial HDL-cholesterol.

Published online in Nutrition and Metabolism (, the study demonstrates that an interesterified fat--(a modified fat that includes hydrogenation followed by rearrangements of fats molecules by the process called interesterification) enriched with saturated stearic acid--adversely affected human metabolism of lipoproteins and glucose, compared to an unmodified, natural saturated fat. Interesterification to generate a stearic acid-rich fat is fast becoming the method of choice to modify fats in foods that require a longer shelf life because this process hardens fat similar to oils containing trans-fatty acids. The new study shows that interesterification, which unnaturally rearranges the position of individual fatty acids on the fat molecule, can alter metabolism in humans.

"One of the most interesting aspects of these findings is the implication that our time-honored focus on fat saturation may tell only part of the story," explained biologist and nutritionist K.C. Hayes, who collaborated on the research with Dr. Kalyana Sundram, nutrition director for palm oil research at the Malaysian Palm Oil Board in Kuala Lampur.

"Now it appears that the actual structure of the individual fat molecule is critical, that is, the specific location of individual fatty acids, particularly saturated fatty acids, on the glycerol molecule as consumed seems to make a difference on downstream metabolism of fat and glucose," said Hayes. Both Hayes and Sundram are experts on human lipid metabolism and were instrumental in the development of Smart Balance® Buttery Spreads, a blend of vegetable oils that improves the cholesterol ratio.

Trans-fatty acids, which became ubiquitous in baked goods, processed foods and restaurant cooking decades ago because of their shelf life and other properties, are now being abandoned by many producers of commercial products such as cookies, crackers, pies, doughnuts, and French fries because they raise LDL ("bad") cholesterol, lower HDL ("good") cholesterol and contribute to heart disease.

The Malaysian-Brandeis collaboration compared trans-rich and interesterified fats with an unmodified saturated fat, palm olein, for their relative impact on blood lipids and plasma glucose. Thirty human volunteers participated in the study, which strictly controlled total fat and fatty acid composition in the subjects' diet. Each subject consumed all three diets in random rotation during four-week diet periods. This study further confirmed previous studies in animals and humans, indicating once again that trans fats negatively affect LDL and HDL cholesterol. Surprisingly, the interesterified fat had a similar, though weaker impact on cholesterol.

"In this study we discovered that trans fat also has a weak negative influence on blood glucose. The newer replacement for trans, so-called interesterified fat, appears even worse in that regard, raising glucose 20 percent in a month," said Hayes.

"This is the first human study to examine simultaneously the metabolic effects of the two most common replacement fats for a natural saturated fat widely incorporated in foods. As such, it is somewhat alarming that both modified fats failed to pass the sniff test for metabolic performance relative to palm olein itself," noted Sundram.

"Whether this reflects the amount of test fat consumed, underlying genetics of the specific population examined, or some unknown factor, requires further study because the apparent adverse impact on insulin metabolism is a troubling finding," he added.


  1. Why don't we just go back to using beef tallow and lard? Coconut oil? Why do we have to modify the fats that we use for frying and baking? Shelf life? Cost?

  2. I'm starting to think they will never learn!!!

    Remember the old margarine commercial "It's not nice to fool mother nature"? Little did we know back then, they were right!!

    This, to me, is just another reason to avoid processed foods.

    Welcome back!! Hope you had a great vacation!!

  3. It's an article of 'faith' that saturated fat is harmful by raising LDL cholesterol. (Never mind that they also raise HDL, more than neutralizing any harmful effects from the increased cholsterol, that is if you really believe in that kind of thing). However, I have never found an explanation as to what biochemical processes are occurring that make saturated fat so harmful as opposed to say polyunsaturated fats that are relatively unstable due to the double bond configuration leading to peroxidation. Of course, small quantities of polyunsaturates are needed, i.e. the essential fatty acids). This is a problem of faith trumping science.

    The effect of trans fats raising both blood sugar and lowering insulin levels assuming the research is valid could explain, in part, the diabetes epidemic, although I think that the massive increase in the use of nutritive sweeteners is the more significant factor.

  4. How in the world do these people who are sucking all the real nutrition out of our foods (and replacing it with artificial junk that's not even from food sources) think that humans survived all these thousands of years, if food in it's natural state was so incredibly bad for us?

    "It's not nice to fool Mother Nature."


  5. Anonymous8:58 PM

    Why is saturated fat the big bad?? It is more natural to our bodies than polyunsatruated or any version thereof of transfats. Most research would indicate that vegetable oils while great cold & in salad dressing change composition & become toxic when heated for frying. Especially when used again & again. The penny will never drop for these morons because why would you slay a beautiful hypothosis like cholesterol causing heart disease with they ugly truth!! It doesen't!