September 29, 2009

On Pavlov and Artificial Sweet

Filed under: Nutrition, Somaception — Tony @ 12:02 pm

The story of Pavlov and his dog is important to our understanding of artificial sweeteners, say researchers from Purdue University. In the late 1800’s Ivan Pavlov conducted a study on “conditioned reflexes” based on work he did with his dog. What Pavlov would do is ring a bell when it was dinner time for the dog. The dog soon associated the sound of the bell with the sights and smells of dinner. Later Pavlov found that the sound of the bell alone, without the stimulating sights and smells of food, could make the dog salivate.

As simple or as obvious as the experiment sounds, it was important in establishing that there is a complex interplay of the body’s functions with the mind’s perceptions. Saliva is a digestive juice. It contains enzymes that start the breakdown of food. He showed that if the mind’s perception is that dinner is coming, the corresponding bodily processes are put in motion.
Most of us have experienced this at one time or another. We can see or smell some food and become instantly hungry for it. We crave it. Our mind sets our body in motion.

Consider that from the time we sit down to a meal and the time our bodies actually begin the digestive process there is a lag… But taste, smell, mouth-feel, and other senses are sending signals to our brain immediately. What we don’t have a thorough understanding of is how our body uses the signals from the brain. We don’t fully know what processes are set in motion by the taste of sweet, for example.

The researchers Davidson and Swithers at Purdue found that artificial sweeteners can produce conflicting signals. They propose that the body has a natural calorie counter. The body has some ability to regulate and determine when enough is enough… until artificial sweeteners are thrown into the mix. The artificial sweeteners break the mind – body connection. It may be that the mind is stimulated by the sweets but never receives the feedback from the body, that the body is satisfied… so the natural calorie counter is disrupted.

Dr. Swithers - Talk on artificial sweetners
http://www.purdue.edu/UNS/html4ever/2004/040629.Swithers.research.html

June 9, 2009

Dieting and genetics. The myth of the “fat gene”

Filed under: Nutrition — Tony @ 5:59 pm

genetic_manipulationWe’re all aware that genetics plays a role in weight loss but the story is told to us in some sort of vague accusation. As if it’s OUR genetics that are faulty… leaving us cursing the fact that we didn’t get better genes in the big raffle.

The role of genetics has been largely misunderstood. A lot of time has been spent on searching out the “fat gene”. Somehow thinking that a category of people will eventually be able to take a pill and shut this gene down. Several times in recent years this “Fat Gene” has been found by different teams of scientists only to later be debunked as existing in thin people too.

The fact is that we ALL share the genetics that allow us to gain weight. It’s a critical survival tool. We all come from an unbroken an ancient lineage of survivors. We are from the survivors of food stress and famine; survivors of malnutrition; survivors of war and exploitation. These are the genes we carry. We carry the genes of ancestors that fought conditions that may be unimaginable to us in modern times while subsisting on foods that were makeshift at best.

The human condition in earlier times was a constant cycle of famine; long periods of time without food or with only nutrient poor foods. That cycle put direct pressure on our genes. People that could store the energy to live through the cycle made lived to pass on their genes to us. Those that couldn’t store energy didn’t. We now all carry the genes to help us survive famine even though most of us don’t ever have to go a day without food unless we decide to.

The role of individual genetics in weight gain has never been proven to me more than a minimal blip. So don’t lose hope and know that you carry the genes of only survivors.

June 6, 2009

Lard; good for you after all?

Filed under: Nutrition — Tony @ 7:49 am

lard

Lard

After decades of trying, its moment is finally here.

By Regina Schrambling

Wait long enough and everything bad for you is good again. Sugar? Naturally better than high-fructose corn syrup. Chocolate? A bar a day keeps the doctor away. Caffeine? Bring it on.

Lard, however, has always been a ridiculously hard sell. Over at least the last 15 years, it’s repeatedly been given a clean bill of health, and good cooks regularly point out how superior this totally natural fat is for frying and pastries. But that hasn’t been enough to keep Americans from recoiling—lard’s negative connotations of flowing flesh and vats of grease and epithets like lardass and tub of lard have been absurd hurdles. But no longer. I’m convinced that the redemption of lard is finally at hand because we live in a world where trendiness is next to godliness. And lard hits all the right notes, especially if you euphemize it as rendered pork fat—bacon butter.

Lard has clearly won the health debate. Shortening, the synthetic substitute foisted on this country over the last century, has proven to be a much bigger health hazard because it contains trans fats, the bugaboo du jour. Corporate food scientists figured out long ago that you can fool most of the people most of the time, and shortening (and its butter-aping cousin, margarine) had a pretty good ride after Crisco was introduced in 1911 as a substitute for the poor man’s fat. But shortening really vanquished lard in the 1950s when researchers first connected animal fat in the diet to coronary heart disease. By the ’90s, Americans had been indoctrinated to mainline olive oil, but shortening was still the go-to solid fat over lard or even butter in far too many cookbooks.

I have to admit even I was suckered by the nutrition nuttiness, despite having been all but weaned on lard in a Mexican neighborhood in Arizona. The great Mexican cooks in kitchens on either side of our house used it to make wondrously supple flour tortillas and almost airy tamales, while my Oklahoma-born dad worked it into biscuits and melted it for frying anything in his cast-iron skillet before we could afford, as he always put it, to “eat like white folks.” (Peasant food has cachet only if you are not forced to live on it.) As a food writer, I learned early on that it was considered a four-letter word in recipes, even when it was essential for authenticity. (You can substitute butter in Mexican aniseed cookies called bizcochos, but they won’t be as crisp, crunchy, and delicate.)

That’s all changed. Now you could even argue that lard is good for you. As Jennifer McLagan points out in her celebrated book Fat: An Appreciation of a Misunderstood Ingredient, With Recipes, lard’s fat is also mostly monounsaturated, which is healthier than saturated fat. And even the saturated fat in lard has a neutral effect on blood cholesterol. Not to mention that lard has a higher smoking point than other fats, allowing foods like chicken to absorb less grease when fried in it. And, of course, fat in general has its upsides. The body converts it to fuel, and it helps absorb nutrients, particularly calcium and vitamins.

What matters more, though, is that lard has become the right ingredient at the right time. It fits perfectly into the Michael Pollan crusade to promote foods that have been processed as minimally as possible: Your great-grandmother surely cooked with it, so you should, too.

Add to that the new awareness that what you eat matters environmentally—if you are going to eat an animal on a planet at risk from too many humans raising too many animals to eat, you have to eat the whole thing. Lard is just about the last stop before the squeal when pork producers are extracting every savory bit from a pig.

That environmental consciousness coupled with competitive cooking has resulted in the nose-to-tail trend set off by British chef Fergus Henderson. Walk into any high-end restaurant these days and pork chops are less prevalent than pig’s ears, trotters, and jowls. The salumi/charcuterie craze has also been great for enhancing lard’s profile, particularly thanks to lardo—pork belly cured Tuscan-style with wine and herbs and served in thin slices over warm bread or on pizza. If Mario Batali says it’s good, diners everywhere listen.

The best lard is leaf lard, from the fat around the kidneys of a hog, preferably a heritage hog. Flying Pigs Farm sells this at the Greenmarket in Union Square in New York City for $6 per 8-ounce container, and it sells out fast. Lard from the supermarket can still be pretty scary; most of it has been hydrogenated to make it last longer.

(As I learned from lard crusader Zarela Martinez in New York, you can make your own if you can get your hands on top-quality fat from a small producer—back, belly, or kidney fat will all work. Cut it into chunks and cook them very slowly over low heat until the fat seeps out and only crispy bits are left. Strain it and save the fat in the refrigerator almost indefinitely. Salt the cracklings and eat them as what Mexicans call chicharrones.)

Only one thing may put lard back on the slippery slope: Google the word as news, and it might as well be lard-fearing 1969 all over again. Newspaper food pages still routinely advise using olive or canola oils rather than “fattening” or “artery-clogging” lard. Or they print idiotic utterances like “you get all the lard you need at McDonald’s” (a chain that actually abandoned beef tallow for frying its fries only to be saddled with a trans-fatty substitute). Occasionally an article will make a valid point—lard is still anathema to vegetarians and halal observers—but more often there will be surprise that lard does not taste anything like pig.

Which is one more reason it is taking off at last. It’s stealth fat.

Regina Schrambling is a longtime food writer in New York who writes gastropoda.com and blogs at both gastriques.blogspot.com and epicurious.com.

Article URL: http://www.slate.com/id/2219314/