In heart disease prevention, shoot for perfection

12. April 2006 William Davis (0)
It really struck me today that it's the people who've chosen to compromise their prevention program who end up with trouble--heart procedures, heart attack, even heart failure.

Take Bob, for example. Bob is 73 years old and had a bypass operation in 2000. The procedure went well and Bob enjoyed 6 years of seemingly trouble-free life. Bob had a seriously low HDL cholesterol for which he as taken a modest dose of niacin, but was unwilling to do much more. His HDL cholesterol was thererefore "stalled" at around 40 mg. (We aim for 60 mg or greater.) We talked repeatedly about the options for increasing HDL but Bob was content with his results. After all, since his bypass operation, he'd felt well and could do all he wanted without physical limitation.

But Bob underwent a stress test for surveillance purposes (which we routinely do 5 or more years after bypass surgery). The test was markedly abnormal with two major areas of poor blood flow to his heart (signalling potential heart attack in future). Bob ended up getting 5 stents to salvage two bypass grafts, both of which showed signs of substantial degeneration.

I've seen this scenario repeatedly: A person is unwilling to go the extra mile to obtain perfection in lipid/lipoprotein patterns, lifestyle changes, and taking the basic, required supplements. Compromises eventually catch up to you in the form of another heart attack, more procedures, heart failure, physical disability, even death.

The message: Don't draw compromises in heart disease prevention. Coronary plaque is a chronic process. It will take advantage of you if you ever let your guard down.

The epidemic of small LDL

11. April 2006 William Davis (0)
Of the patients I saw in my office yesterday, virtually EVERYONE had small LDL.

Small LDL is emerging as an extraordinarily prevalent lipoprotein pattern that drives coronary plaque growth. Previous estimates have put small LDL as affecting only 20-30% of people with coronary disease. However, in my experience in the last few years, I would estimate that greater than 80% of people with measurable coronary plaque have small LDL.

If you have a heart scan score >zero, chances are you have it, too.

I call small LDL a "modern" disease because it has skyrocketed in prevalence recently because of the great surge in inactivity in Americans.

When's the last time you walked to the grocery store and back, lugging two bags of groceries? How many years has it been since you've push-mowed your lawn? All the small conveniences of life have permeated further and further into our activities. Most of us spend the great majority of our day right where you are now--on your duff.

On the bright side, small LDL in most people is reducable by simply getting up and going. But the old teaching of 30 minutes of activity per day is now outdated. This was true when the other hours of your life included physical activities, like housework or a moderately active job. However, if the other 23 1/2 hours of your day are sedentary, then 30 minutes a day won't do it. An hour or more of activity, whether exercise or physical labor of some variety will get you better small LDL-suppressing results.

For most people with small LDL, fish oil and niacin are also necessary to fully suppress small LDL to the Track Your Plaque goal of <10 mg/dl.

A great discussion on vitamin D

10. April 2006 William Davis (0)
If you need better convincing that vitamin D is among the most underappreciated but crucial vitamins for health, see Russell Martin's review of vitamin D and its role in cancer prevention. You'll find it in March, 2006 Life Extension Magazine or their www.LEF.org website at:

http://search.lef.org/cgi-src-bin/MsmGo.exe?grab_id=0&page_id=1308&query=vitamin%20d&hiword=VITAM%20VITAMER%20VITAMERS%20VITAMI%20VITAMINA%20VITAMINAS%20VITAMINC%20VITAMIND%20VITAMINE%20VITAMINEN%20VITAMINES%20VITAMINIC%20VITAMINK%20VITAMINS%20d%20vitamin%20

Our preliminary experience over the past year suggests that vitamin D may be the crucial missing link in many people's plaque control program. We've had a handful of people who, despite an otherwise perfect program (LDL<60, HDL>60, etc.; vigorous exercise, healthy food selection, etc.--I mean perfect)continued to show plaque growth. The rate of growth was slower than the natural expected rate of 30% per year, but still frightening rates of 14-18% per year--until we added vitamin D. All of a sudden, we saw dramatic regression of 7-25% in 6 months to a year.

This does not mean that vitamin D all by itself regresses plaque. I believe it means that vitamin D exerts a "permissive" effect, allowing all the other treatments (fish oil, LDL reduction, HDL raising, correction of small LDL, etc.) to exert their full benefit. So please don't stop everything and just take D. This will not work. However, adding vitamin D to your program on top of the basic Track Your Plaque approach--that's the best way I know of.

MSNBC Report: We need more heart procedures!

10. April 2006 William Davis (0)
A recent headline from MSNBC by Robert Bazell reads:

NEW YORK - Angioplasty, bypass surgery and cholesterol-lowering medications are among the many interventions that have brought a sharp decrease in heart disease deaths in recent years. But, as Dr. Sharon Hayes of the Mayo Clinic points out, there is one big problem.

“The death rates in women have not declined as much as they have in men,” she says.

The piece goes on to suggest that women are getting short-ended in the diagnosis of heart symptoms and heart attack. The solution: More testing to assess the need for procedures like bypass.

This is typical of the device and medication-dominated media consciousness: More procedures, more medication, more devices. Who's paying for advertising, after all? The money at stake is huge. But is this what you want?

Don't be swayed by media reporters with limited understanding of the real issues (at best), consciousness of who's paying for advertising (at worst). Yes, heart disese is often underestimated or misdiagnosed in women. The answer is better detection earlier in life followed by efforts to halt the process--effective, safe treatments for people's benefit, not just profit.

What role cholesterol medication?

10. April 2006 William Davis (0)
A frequent conversation point among my patients, as well as participants in the www.cureality.com program, is "Are cholesterol medications really necessary?"

No, they are not. What IS necessary is to correct all manifest and hidden causes of coronary plaque. Among these causes, in my view, is LDL cholesterol of 60 mg/dl or greater. There are many other causes of coronary plaque--e.g., small LDL particles, unrecognized hypertension, Lp(a), hidden diabetic patterns, etc.--but reducing LDL to 60 mg is still an important part of a plaque-reversing effort.

Insofar as we wish to get LDL to this goal, the statin cholesterol drugs like Lipitor, Zocor, Crestor, etc. may play a role. However, they should only be considered after a full effort dietary program is pursued. Don't follow the American Heart Association's diet unless you want to fail. It's nonsense.

For a more detailed discussion of how to use nutrition and nutritional supplements to reduce LDL cholesterol, go to www.lef.org, the website for the Life Extension Foundation. I wrote an article for their magazine called "Cholesterol and Statin Drugs: Separating Hype from Reality". You'll find the article at http://search.lef.org/cgi-src-bin/MsmGo.exe?grab_id=0&page_id=1295&query=davis%20cholesterol%20natural&hiword=CHOLESTEROLA%20CHOLESTEROLS%20DAVI%20DAVID%20DAVIE%20DAVIES%20DAVIN%20DAVIO%20DAVISON%20DAVISS%20DAVIT%20NATURALBASED%20NATURALES%20NATURALIZED%20NATURALLY%20NATURALS%20NATURE%20NATURES%20cholesterol%20davis%20natural%20.)

Can your plaque-reversal efforts succeed without statin drugs? It depends on your causes. For instance, someone with small LDL and Lp(a) only may do great on our basic program and then add niacin. Unfortunately, another person with a starting LDL cholesterol of 240 mg/dl--sky high--will have more success with these drugs.

Believe me, I am no blind supporter of drug companies and their flagrantly profit-seeking practices which, in my view, are cut-throat, shoving anyone and anything out of their way to increase profits and market share. I share many of Dr. Dave Warnarowski's views on how vicious their tactics can be; see his recent Blog post at http://www.drdavesbest.com/blog/ called "I smell a rat".

Nonetheless, the deep and well-funded research of the pharmaceutical industry does yield some useful tools. You don't have to love the insect exterminator, but if your house is being eaten by termites, his services can be useful. Same thing with these drugs. Useful--not the complete answer, not even close, but nonetheless useful in the right situations. Sometimes antibiotics are necessary, even life saving. That's how cholesterol drugs are, too.

Take it all in the proper perspective. Your goal is not cholesterol reduction, per se, but plaque control, preferably reversal.

Supplement Mania!

9. April 2006 William Davis (3)
Ever hear of "polypharmacy"? That's when someone takes too many medicines. People will have lists of 15-20 prescription medicines, for instance, with crazy interactions and oodles of side-effects.

Well, how about "poly-supplments"? That's when someone takes a large number of nutritional supplements.

Let me tell you about a 45 year old man I met.

In an effort to rid himself of risk for heart disease that he felt was likely shared with his family (brother and father diagnosed with heart attacks in their late 40s), Steve followed a program of nutritional supplementation. You name it, he took it: hawthorne, anti-oxidant mixtures, vitamins C, E, B-complex, saw palmetto, 7-keto DHEA, velvet deer antler, gingko biloba, policosanol, chronium picolinate, green tea, pine bark extract, St. John's Wort, CoEnzyme Q10, papain and other digestive enzymes...He became a distributor for a nutritional supplement company to allow him to afford his own extraordinary program.

To satisfy himself that he had indeed "cured" himself of heart disease, he got himself a CT heart scan. His score: 470, in th 99th percentile. Steve's heart attack risk based on this score was around 10% per year. High risk, no question.

For weeks after his scan, Steve admitted walking around in a daze, not knowing what to do. Years of telling himself that he had effectively dealt with his heart disease risk, now all down the drain.

When we met, I persuaded him that to think that this collection of supplements would reverse heart disease was magical thinking. We trimmed his list down to the essentials and got him on the right track.

Heart disease is controllable and reversible, but not this way. Don't fool yourself into thinking that some collection of supplements will be enough to stamp out your heart disease risk. Just like taking an antibiotic when you don't have an infection achieves nothing, so does taking the wrong supplements.

What does heart scanning mean to you?

8. April 2006 William Davis (0)
CT heart scans can mean different things to different people.


What does a heart scan mean to you? There are several possibilities:

1) A way of reducing uncertainty in your future.

2) A tool to crystallize your commitment to health.

3) A device to help you track how successful your heart disease prevention program is.

4) A trick to get you in the hospital.

5) A moneymaking tool for unscrupulous physicians hoping to profit from "downstream" testing, particularly heart catheterizations.


Like anything, heart scans can be used for both good and evil. How can you be sure that your heart scan is put to proper use--for your benefit and not someone else's profit?

Simple: Get educated. Understand the issues, be armed with informed questions.

If, for instance, you're a 55-year old female with a heart scan score of 90, active without symptoms, and you're told to have a heart catheterization right off the bat---run the other way. This is bad advice. A heart procedure like catheterization at this score in an asymptomatic woman is very rarely necessary. That decision can only be made after a step-by-step series of decisions are made by a truly interested, unbiased party. (A stress test is almost always required in this situation before the decision can be made to proceed with a catheterization.)

Unfortunately, in 2006, getting unbiased advice from your doctor is still a struggle. That's why we started Track Your Plaque---unbiased information, uncolored by drug or device company support, with an interest in the truth.

Coronary disease is drying up!

7. April 2006 William Davis (1)
I had an interesting conversation with a device representative this morning. He was a sales representative for a major medical manufacturer of stents, defibrillators, and other such devices for heart disease.

Since I'm still involved with hospital heart care and cardiac catheterization laboratories, this representative asked me if I was interested in getting involved with some of the new cardiac devices making it to market over the next year or two. "The coronary market is drying up, what with coated stents and such. We've got to find new profit sources."

Well, doesn't that sum it up? If you haven't already had this epiphany, here it is:

HEART DISEASE IS A PROFITABLE BUSINESS!

Why else can hospitals afford billboards, $10 million dollar annual ad campaigns, etc.? They do it for PROFIT. Likewise, device and drug manufacturers see the tremendous profit in heart disease.

The representative's comments about the market "drying up" simply means that the use of coated stents has cut back on the need for repeat procedures. It does NOT mean that coronary disease is on the way out. On the contrary, for the people and institutions who stand to profit from heart care, there's lots of opportunity.

Track Your Plaque is trying to battle this trend. Heart disease should NOT be profitable. For the vast majority of us, it is a preventable process, much like house fires and dental cavities.

Mammogram for your heart

6. April 2006 William Davis (0)
With the booming popularity of "64-slice CT scans", there's a lot of mis-information about what these tests provide.

These tests are essentially heart scans with added x-ray dye injected to see the insides of the arteries. However, to accomplish this, a large quantity of radiation is required. In addition, the test is not quantitative, that is, it is not a precise measure that can be repeated year after year.

It is okay to have a 64-slice CT coronary angiogram. It is NOT okay to have one every year. That's too much radiation. However, a heart scan can be repeated every year, if necessary, to track progression or regression. Once stabilization (zero change) or reduction is achieved, then you're done (unless your life takes a major change, like a 20 lb weight gain).

The tried-and-true CT heart scan is the gold standard--easy, inexpensive, precise, and repeatable. Not true for 64-slice angiograms.

Is your doctor using "leeches"?

4. April 2006 William Davis (0)
What if you went to your doctor for a problem and he/she promptly placed leeches on your body?

Yeccchhhh! Would you go back? I'd bet that you'd run the other way as fast as your bleeding legs could take you. Outdated health practices like "bleeding" are outdated for good reason.

Then why would you allow your doctor to approach your heart disease prevention program by checking cholesterol and then waiting for symptoms to appear? That miserable approach leads to tragedy and death all too often--ask Bill Clinton! He might as well have had leeches!

Don't allow your doctor's ignorance or disinterest impede your prevention program. Get your coronary plaque measured, then attack it from all sides by knowing all causes, hidden and obvious. That's why Track Your Plaque is such an effective program.

I often wonder why more doctors aren't using this unbelievably powerful approach to deal with heart disease. But when I see colleagues implanting stents, defibrillators, and the like for many thousands of dollars per patient, the answers are obvious. Given a choice of a rational, effective program of prevention that pays the doctor a few hundred dollars for his time, versus $2000 to $10,000 for a procedure, you can see that the temptation is irresistible for many physicians.
All posts by william-davis

Statin stupid

19. March 2010 William Davis (0)
If we followed the lead of the pharmaceutical industry and my cardiology colleagues, we would all subscribe to the "statins for all" philosophy. There is now $2 billion of clinical "research" to back up this "evidence-based" practice.

I do not endorse this "statins for all" philosophy. I believe it is a product of the raw profiteering of the pharmaceutical industry, who are adept at recruiting physicians to their cause.

But lost in the confusion of tainted studies and over-the-top media saturation is the fact that there are small groups of people who likely do obtain benefit from statin drugs. They would certainly benefit from better informed scrutiny of their lipoprotein and metabolic abnormalities. But treatment may involve statins.

This is entirely distinct from the "statins for all" argument, the simpleminded rule that primary care physicians and cardiologist are told to follow.

Groups who may indeed benefit from statin therapy include:

Homozygous or heterozygous familial hypercholesterolemia--Lacking a receptor for LDL particles, LDL piles up to very high levels in these people. LDLs of 300+ are common and lead to heart disease and stroke at relatively young ages.

Combined mixed hyperlipidemia--Among the one or more genetic defects underlying this condition involves excessive production of apoprotein B and VLDL particles. This leads to high risk for heart disease.

People unable to follow a diet to correct their lipid disorder--I have 80+-year old patients, for instance, who say, "I've eaten this way for 82 years. I'm not going to change now!" In the absence of diet and other efforts (e.g., omega-3 fatty acids from fish oil), drugs may be the answer.

In other words, of the $27 billion annual bill for statin drugs, perhaps a tiny fraction is truly necessary. The majority of people taking statin drugs would not really need them if they had the real answers. But don't let that confuse us: There are some people who do indeed benefit.

Butter and insulin

19. March 2010 William Davis (83)
In a previous post, Atkins Diet: Common Errors, I commented on butter's unusual ability to provoke insulin responses. I offer this as a possible reason why, after a period of effective weight loss on a low-carbohydrate program, inclusion of some foods, such as butter, will trigger weight gain or stall weight loss efforts.

This develops because of butter's insulin-triggering effect, doubling or tripling insulin responses (postprandial area-under-the-curve). If insulin is triggered, fat gain follows.

Here's one such study documenting this effect: Distinctive postprandial modulation of ß cell function and insulin sensitivity by dietary fats: monounsaturated compared with saturated fatty acids

López et al 2008


From Lopez et al 2008. Mean (± SD) plasma glucose, insulin, triglyceride, and free fatty acid (FFA) concentrations during glucose and triglyceride tolerance test meal (GTTTM) with no fat (control), enriched in monounsaturated fatty acids (MUFAs) from refined olive oil (ROO meal), with added butter, with a mixture of vegetable and fish oils (VEFO) or with high-palmitic sunflower oil (HPSO). N = 14.

The postprandial (after-eating) area-under-the-curve is substantially greater when butter is included in the mixed composition meal. This effect is not unique to butter, but is shared by most other dairy products.

Fat, in general, does not make you fat. But butter makes you fat.

Vitamin D as a cardiovascular risk factor gains ground

18. March 2010 William Davis (0)
If you were reading The Heart Scan Blog back in 2007, or read my Life Extension article on vitamin D deficiency as a cardiovascular risk factor, you already knew that vitamin D deficiency is rampant and adds to cardiovascular risk.

Results of a study from the Intermountain Medical Center Heart Institute in Utah bolster the concept that vitamin D deficiency is a cardiovascular risk factor, vitamin D normalization/supplementation reduces cardiovascular risk.

Science Daily reported:

For the first study, researchers followed two groups of patients for an average of one year each. In the first study group, over 9,400 patients, mostly female, reported low initial vitamin D levels, and had at least one follow up exam during that time period. Researchers found that 47 percent of the patients who increased their levels of vitamin D between the two visits showed a reduced risk for cardiovascular disease.


In the second study, researchers placed over 31,000 patients into three categories based on their levels of vitamin D. The patients in each category who increased their vitamin D levels to 43 nanograms per milliliter of blood or higher had lower rates of death, diabetes, cardiovascular disease, myocardial infarction, heart failure, high blood pressure, depression, and kidney failure. Currently, a level of 30 nanograms per milliliter is considered "normal."


Over the past 4 years, people in our program have been enjoying the extravagant benefits of vitamin D restoration. Cardiovascular benefits are becoming better documented and the bone health, cancer-preventing, insulin-normalizing, mood-adjusting, and anti-inflammatory effects likewise.

Atkins Diet: Common errors

18. March 2010 William Davis (74)
No doubt: The diet approach advocated by the late Dr. Robert Atkins was a heck of a lot closer to an ideal diet than the knuckleheaded advice emitting from the USDA, American Heart Association, American Diabetes Association, and the Surgeon General's office.

But having just spent a week with Atkins low-carbers, here are some common errors that I see many make, errors that I believe have long-term health consequences, including impairment of weight loss.

Excessive consumption of animal products--Non-restriction of fat often leads to over-reliance on animal products. Higher intakes of red meats (heme proteins?) have been strongly associated with increased risk for colon and other gastrointestinal tract cancers. It is not a fat issue; it is an animal product issue. We should consume less meat, more vegetables and other plant-sourced foods.

Consumption of cured meats--Cured, processed meats, such as sausage, hot dogs, salami, bologna, and bacon, have a color fixative called sodium nitrite, an additive that has been confidently linked to gastrointestinal cancers. Risk is likely dose-dependent: The more you ingest, the greater the long-term risk.

Overconsumption of dairy products--Dairy products, especially milk, yogurt, cottage cheese, and butter, are potent insulinotropic foods, i.e., foods that trigger insulin release. There can be up to a tripling of insulin (area-under-the-curve) levels. This is not good in a world populated with tired, overworked pancreases, exhausted from a lifetime of high-carbohydrate eating.

Too many calories--While I agree that "a calorie is a calorie" and "calories in, calories out" are faulty concepts, I have anecdotally observed that long-time low-carbers often trend towards unlimited consumption of food, a phenomenon that seems to result in weight gain, especially in the sedentary. I wonder if this is a reflection of the insulinotropic action of dairy products and other proteins, compounded by the poor insulin responsiveness that develops with lack of physical activity. Factor into this conversation that lower calorie intake extends life, probably substantially (Sirt-2 activation and related phenomena, a la resveratrol). If lower calorie intake extends life, unlimited calorie intake likely shortens life.

Please don't hear this as low-carb bashing--it is not. It is a call to improve diets and not stumble into common traps that can impair heart health, weight loss, and longevity.

Fat Head: Tom Naughton's manifesto for low-carb eating

12. March 2010 William Davis (16)
I just got back from Jimmy Moore's low-carb cruise to the Bahamas.

Among the many interesting people I met on the cruise was the creator of the documentary film, Fat Head, Tom Naughton.

Tom brings both creative insights into low-carbohydrate eating as well as humor. Low-carb eating can be a pretty contentious issue, but Tom made it fun. He will make you laugh about many of the odd notions we have about diet.

Among the best parts of Fat Head is Tom's portrayal of the effects of carbohydrates on insulin and fat metabolism:






Fat Head joins the ranks of films like Food, Inc, that make nutrition information entertaining. For anyone interested in a unvarnished look at diet, weight loss, along with a few laughs along the way, Tom Naughton's Fat Head is worth viewing.

Oatmeal: Good or bad?

11. March 2010 William Davis (67)

You've heard it before: oatmeal reduces cholesterol. Oatmeal producers have obtained permission from the FDA to use a cholesterol-reducing claim. The American Heart Association provides a (paid) endorsement of Quaker Oats.

I've lost count of the times I've asked someone whether they ate a healthy breakfast and the answer was "Sure. I had oatmeal."

Is this true? Is oatmeal heart healthy because it reduces LDL cholesterol?

I don't think so. Try this: Have a serving of slow-cooked (e.g., steel-cut, Irish, etc.) oatmeal. Most people will consume oatmeal with skim or 1% milk and some dried or fresh fruit. Wait an hour, then check your blood sugar.

If you are not diabetic and have a fasting blood sugar in the "normal" range (<100 mg/dl), you will typically have a 1-hour blood glucose of 150-180 mg/dl--very high. If you have mildly increased fasting blood sugars between 100 and 126 mg/dl, postprandial (after-eating) blood sugars will easily exceed 180 mg/dl. If you have diabetes, hold onto your hat because, even if you take medications, blood sugar one hour after oatmeal will usually be between 200 and 300 mg/dl.

This is because oatmeal is converted rapidly to sugar, and a lot of it. Even if you were to repeat the experiment with no dried or fresh fruit, you will still witness high blood sugars in these ranges. Do like some people and pile on the raisins, dried cranberries, or brown sugar, and you will see blood sugars go even higher.

Blood sugars this high, experienced repetitively, will damage the delicate insulin-producing beta cells of your pancreas (glucose toxicity). It also glycates proteins of the eyes and vascular walls. The blood glucose effects of oatmeal really don't differ much from a large Snickers bar or bowl of jelly beans.

If you are like most people, you too will show high blood sugars after oatmeal. It's easy to find out . . . check your postprandial blood sugar.

In past, I recommended oat products, specifically oat bran, to reduce LDL, especially small LDL. I've changed my mind: I now no longer recommend any oat product due to its blood sugar-increasing effects.

Better choices: eggs, ground flaxseed as a hot cereal, cheese (the one dairy product that does not excessively trigger insulin), raw nuts, salads, leftovers from last evening's dinner.

Mustard: Super health food?

6. March 2010 William Davis (32)
Could mustard--yes, the yellow condiment you smear on hot dogs--be a super heart healthy food in disguise?

Consider that mustard contains:

Vinegar

Turmeric

No appreciable sugar


The vinegar slows gastric emptying, resulting in slower absorption of any carbohydrates and a reduced glucose area-under-the-curve. Of the little fats contained (about 3 grams per 1/4 cup), most are desirable monounsaturates. Mustards are relatively rich in selenium, with 20 mcg per 1/4 cup, helpful for protection against cancer and thyroid disease, and magnesium, 31 mg per 1/4 cup.

Turmeric is added to most mustards. One of the constituents of turmeric, curcumin, the substance that confers the bright yellow color, has been a focus of interest for its anti-inflammatory effects. Curcumin has been documented to reduce activity of the inflammatory enzymes cyclooxygenase-2 (COX-2), lipoxygenase, and reduce activity of inflammatory signal molecules, tumor necrosis factor-alpha (TNF-a), interleukin (IL)-1,2,6,8, and 12, and monocyte chemoattractant protein (MCP). Curcumin also has been shown to reduce LDL oxidation, a potentially important step in atherosclerotic plaque formation. Turmeric is used as a tea by Okinawans. (Hmmmm . . . )

Turmeric content of mustard can vary, of course. Likewise, sugar content. Look for mustards that are not sweetened, so avoid honey mustard in particular. Look for hot, brown, horseradish, Dijon, etc. If there is a downside to mustard, it's sodium content, though the 709 mg per 1/4 cup should only be a problem for those who are sodium-sensitive (African Americans, in particular).

So perhaps mustard isn't exactly a super health food. But it may have some bona fide health effects and should be used generously especially if you are concerned about blood sugar and inflammatory phenomena.

Exercise and blood sugar

5. March 2010 William Davis (30)
There is no doubt that exercise yields benefits across a spectrum of health: reduced blood pressure,  reduced inflammation, reduced blood coagulation, better weight control, stronger bones, less depression, reduced risk for heart attack.

Exercise also influences blood sugar. Diabetics understand this best: Exercise reduces blood sugar 20, 30, 50 or more milligrams. A starting blood sugar, for instance, of 160 mg/dl can be reduced to 80 mg/dl by jogging or riding a bicycle. (I recently had brunch at an Indian restaurant with my family. Blood sugar one-hour postprandial: 134 mg/dl. I was sleepy and foggy. I got on my stationary bike and pedalled at a moderate clip for 60 minutes. Blood sugar: 90 mg/dl.)

Could the reduction of blood sugar with exercise be THE reason that exercise and physical activity provide such substantial benefits?

Think about it. Reduced blood sugar:

1) Reduces risk for future cardiovascular events.
2) Reduces glycation of proteins, i.e., reduced glucose binding to proteins like the ones in artery walls and the lenses of your eyes.
3) Reduces blood coagulation
4) Reduces endothelial dysfunction (abnormal artery constriction that leads to atherosclerosis)

This might explain why it doesn't require high levels of aerobic activity to derive benefit from exercise, since even modest efforts (e.g., a 15-minute walk after eating) reduce blood sugar substantially.

The incredible 33-year, 18,000-participant Whitehall study tells us that a postprandial (after-eating) blood sugar of an impossibly-difficult 83 mg/dl is required to erase the excess cardiovascular risk of blood sugar. Could this simply be telling us that physical activity or exercise is required to suppress blood sugars to these low levels?

It makes me wonder if an index of the adequacy of exercise is your post-exercise blood glucose.