Just because I've been touting such low-fat food wonders as those non-stick cooking sprays (the ones that don't taste like ass, anyway) does not mean that I'm another of those anti-fat automatons out there in the diet-o-sphere. Fat as such is not an optional or superfluous nutrient--it is in fact vital to human health and proper body function. The type, quality, and quantity of fat consumed does make a huge difference--but you can't do without fat altogether.
Nor would you want to. As the mantra among gourmet chefs and fanatical foodies goes, "fat carries flavor." Fats, properly used, significantly enhance the flavor of foods whether as a cooking medium or a condiment. Fat also provides that extra little kick of satiation that makes a meal stay with you longer than than one without does. No magic in that--while the digestive process rips through a simple carbohydrate (such as a piece of fruit) in about an hour, complex carbs such as whole grains in two hours, and protein in 3 to 5 hours, fats can take as long as 6 hours to digest completely. Plus fat in the tummy slows the digestion of any foods it's been eaten with, adding to the satiation effect.
And when that fat is digested, some of it (depending on type) gets used for some extremely vital functions. Fats are the basic building blocks of cell walls. Nerve cells need fats in order to function properly--in fact, the composition of a healthy human brain is upwards of 60% fat. Fats are also components of certain hormones necessary to proper body function, and are essential for processing certain vitamins that are soluble only in fats.
However, very little of that fat, regardless of type, is used for the body's immediate energy needs. While fat is a much denser source of energy than the other nutrients--providing 9 calories per gram, as opposed to 4 calories per gram for carbohydrates and protein--it converts into energy much less efficiently than the body's preferred fuel, glucose. In fact, the body is wired to prefer glucose for its fuel needs over fats even if both nutrients are available in the metabolic pipeline. Meanwhile, fat goes into storage in the body very easily--and once stored, the body is marvelously stingy about releasing it again. While this is very useful from an evolutionary standpoint, in terms of surviving famines and such, it is rather a pain in the ass for modern humans living in much cushier cultures.
So one goal for the healthy dieter is to consume just the right amount of fat for optimum body functioning, and no more. Most reliable nutritional pundits out there recommend you consume a maximum of 30% of one's daily calories in the form of fats. In a 1400 calorie/day diet, this works out to a bit over 46 grams of fat. That in turn would equal, for example, a smidge less that 4 tablespoons of cooking oil--though for your daily fat intake you also have to take into account the fat "hidden" in other foods (in meats, egg yolks, dairy products, tofu, nuts, certain fruits and vegetables such as bananas and avocados, and of course by the ton in processed foods and fast-food meals). Under my food plan, I'm probably getting about 20% of my calories from fats max, and I'm feeling pretty good at that level.
The other major goal for the fat-savvy dieter is to choose the right kinds of fats. Yeah, it seems like every time you turn around there's another study saying this kind of fat is good, that one is bad, this one that we thought was bad is actually good, and vice versa, until you think your (fat-laden) brain is about to explode. A lot of that is confusion is more the fault of over-simplistic, over-sensationalized reporting of scientific studies by non-technical reporters in sound-bite-obsessed news media than anything else. But the fact is that our knowledge about fats and their function has increased dramatically over the past few decades, and it is worth your while to keep up with the best reputable info from non-brain-dead sources.
In order to understand the differences between different types of fats, you have to dabble a little in some basic chemistry--but don't freak, it's pretty painless. What you need to know: like all nutrients, fats are made up of carbon, hydrogen, and oxygen atoms. The backbone of a fat molecule is a chain consisting of an even number of carbon atoms, off of which hang hydrogen atoms, plus various little branchy bits made of more carbon, hydrogen, and oxygen. Now a carbon atom is capable of having a maximum of four other atoms attached to it. If every single carbon atom in a fat molecule's backbone chain has got its full complement of four atoms attached to it (including its immediate neighbors in the backbone), then that molecule is said to be a saturated fat. If there is just one carbon atom in that chain that has only three atoms linked to it, the molecule is a monounsaturated fat. If there are two or more carbon atoms with less than their full quota of four atoms attached, it is a polyunsaturated fat.
Of these fats, saturated fats (nearly always derived from animal foods, typically solid at room temperature) have been shown by research to be strongly associated with health problems such as heart disease. Monounsaturated fats (typically, though not exclusively, from certain plant sources such as olives and peanuts) have been shown to be healthier for the body, and polyunsaturated fats (again, typically but not exclusively from plant sources) have an even better health record.
Some ways back, the food industry picked up that polyunsaturated fats were healthier than saturated fats, so they started processing unsaturated fat into a solid form that could be used like saturated fats, but didn't go rancid as fast as the unsaturated fats. They did this by packing in extra hydrogen atoms (hydrogenation), producing so-called partially-hydrogenated fats. What these bright lights didn't take into account, however, is that packing those hydrogen atoms onto those carbon chains was basically turning the polyunsaturated fats back into saturated fats--and worse, it produced a new type of chemical known as a trans-fatty acid, which is even more unhealthy for you than a naturally-saturated fat molecule. So--all those partially-hydrogenated margarines and shortenings whose labels proudly proclaim that they're healthier than animal fats? They lie like a rug. (How food labels lie about "low-fat" and other such much-abused phrases is a huge topic in itself, which I plan to hit in some future post).
Then there are fat-related substances such as cholesterol, derived from animal food sources. Keeping the several types of cholesterol straight can really make your brain hurt, especially because high levels of some types in your blood stream (the high-density lipoproteins, or HDLs) are beneficial to heart health, while high levels of others (the low-density lipoproteins or LDLs) are bad for you, and can lead to those cholesterol-laden plaques in arteries that can wreak havoc on your heart. Cholesterol does serve vital functions in the body, but the body is wired to manufacture all the cholesterol it needs for those functions without the need to get any from food. Therefore, the less cholesterol you consume, the better for your overall health.
Finally, there is a special subclass of poly-unsaturated fats known as essential fatty acids (EFAs). Whenever a nutritionist uses the word "essential" to describe a nutrient, it means the body cannot manufacture that nutrient from raw materials on its own, and therefore must get it from its food intake; unlike a lot of polyunsaturated fats, EFAs come from many animal sources as well as plant sources. Studies have shown EFAs to have far-reaching health-enhancing properties for general health, brain health (including mood as well as memory), and relief from inflammatory health problems.
There are two main types of EFAs, omega-3 fatty acids and omega-6 fatty acids. Typically, American diets are plenty rich in omega-6s, but lag far behind in omega-3s, so boosting your omega-3 intake is an excellent thing to do. Alas, a lot of the fatty high-on-the-food-chain fish that are the premier source of omega-3s are the very same fish that tend to concentrate mercury and other toxic pollutants in their fat. Fortunately there is a wealth of fish oil supplements available from health-food stores. Make sure to choose supplements that offer the highest concentration of omega-3s, and that specify that they have been purified to remove any toxic contaminants. Seeds such as flaxseed are also excellent sources omega-3s; admittedly the form of omega-3 they contain is a bit less efficiently processed by the body than those from fish, but flaxseed is still a great resource for vegetarians needing up up their omega-3 content.
So, having waded through all that, what is a person intent on healthy eating to do?
- Cut down on, BUT DO NOT ELIMINATE, fat from the diet
- Cut way down or totally avoid saturated fat, cholesterol, partially-hydrogenated fat, and trans-fatty acids
- Choose mono-unsaturated and poly-unsaturated fats for your daily fat alottment
- Get some omega-3 fatty acids into your life.
- Read food labels like crazy
- Avoid like crazy fast foods and pre-packaged processed foods, which tend to be packed with tons of fat to make up for their flavor deficits.
And have a happy Fat Thursday!
Fistful of Attitude -- a little personal history
On one of Lily Tomlin's records (I think it was Modern Scream, but I don't have a copy to check) there is a clip in which Lily, in character as Edith Ann the four-year-old wiseacre, is taking questions from the audience. Somebody has the wit to ask her "Where do babies come from?" to which she responds, "What, you don't know either?"
"A lot of people ask me that in Slippery Rock," she continues, and then proceeds to pass on a fairly accurate if still kidlike version of the ol' "birds and bees" talk as if it was the most urgent message to the kid underground--complete with the closing admonition: "Now go tell as many people in town as you can."
Where the hell is she going with this? you're probably wondering at this point. Well, it's an attempt to explain some of the attitude I bring to this blog.
I've already ranted about the crapload of mistaken info and guidance I have received over the years concerning weight and diet. That history has understandably made me a bit passionate about the subject matter of this blog. After all, this is all info that could have spared me huge amounts of angst, aggravation, wasted effort and even damage to my health--if someone had passed it on to me way back when I was basically coerced into starting the dieting thing in my teens. So if sometimes a note of evangelical zeal--or for that matter smart-ass know-it-all-ness--creeps into my writing, well, you can blame it on that.
I should add that, if it sometimes sounds like I am totally self-assured and really know what the hell I'm doing on this weight-management thing, well, some of that is a little shakier than it may sound. It's true that I mostly feel a lot more confident and motivated to see this through than I have for a long time, and that feels really good. It doesn't hurt that, so far, I'm progressing very well. But another part of me was almost afraid to type that last sentence for fear of somehow jynxing myself, like that superstition about never stating out loud to a pitcher the fact that he's working on a no-hitter.
In the post I linked to above, I say a bit about how my dad died. My mother's death is also fueling a lot of my attitude here, but in a different way due to her different circumstances. She died back in 1987, at the too-young age of 57--but it was not any complication of her life-long overweight that got her, but metastasized breast cancer, missed by an inattentive doctor. Now some six months before the cancer diagnosis, Mom had started to "inexplicably" drop weight like crazy--a classic early symptom of active cancer, as well as of a number of other serious health conditions. But my mother, another lifelong unsuccessful dieter in thrall to the cultural imperative to be thin at all costs, didn't even think to question this weight loss. She simply went "hurrah, I've finally figured out how to diet!" and went on her merry way.
In case you're thinking my mother was just being dumb here, think of all the times you've ever heard someone joke about how they came down with the flu or a stomach bug or food poisoning or some damn thing, and then said something like "yeah, I was sick as a dog, but I lost weight so at least one good thing came of it." What the hell is up with a culture in which weight loss is celebrated even if it was a direct result of bad health?!? Whatever it is, my mom's case is IMO only an extreme case of this same cultural illogic, a case that underlines its danger.
Anyway, my mom ignored that early warning signal, and her doctor didn't call her on it either ... and then she started getting obviously, undeniably sick, and by then it was really too late.
Not only does this story piss me off all over again every time I think about it, but at the risk of sounding overdramatic, it also does cause the slightest tinge of anxiety to cross my mind concerning my current ease in dropping weight. Paranoid much? But you see, this is exactly why any experience of misguided advice from medical authorities is so deadly--and IMO literally criminal. I've gotten burned, and I've seen loved ones burned, by crap some trusted professional handed us as gospel truth. Not only was our health damaged, but my trust in such professionals has also taken damage.
On some fronts, things in the medical community have gotten a bit better--hell, the program I'm now attending through my HMO is major proof that at least some of the medical community has learned a thing or two about this dieting trip. But there is definitely still crap going on. I had to fire one doctor only a couple of years ago after he persisted in bringing up weight loss surgery multiple times, even after I told him repeatedly that I was dead-set against any such medical quackery--and when I confronted him about it, he was completely stubborn and unrepentant.
So I fired his ass. End of problem for me. But what about other patients who will take this turkey's advice at face value and let their guts be irreversably sliced up and broken, at risk of truly frightening and life-ruining potential side-effects, only to find at the end that they are now sentenced for life to follow a more rigid diet than they ever had to face before? And all for what? Just to lose weight at a dangerously fast rate? What next? Solving the problem of plantar fasciitis by a modern version of Chinese footbinding?!? And all across the nation the marketing for this quackery just keeps getting bigger and bigger. I think you can see how stuff like this might lead to one metric buttload of attitude.
Oh, and there's more crap too, but this post is already threatening to turn into a novel, so I'll leave off for now. Suffice it to say that I've got a lot of history heating up this issue for me, and somehow I find it helpful to my progress to haul pieces of that history out for public viewing. It would be additionally sweet if anything I write here winds up helping even one person who has run into similar crap. They don't necessarily need to then turn around and pass it on to as many other people as they can--but if they did, that would be especially cool.
March 25, 2006 at 11:59 PM in General commentary | Permalink | Comments (5)