ResearchCategory Archives

Do we really need five a day?

I’m currently reading Trick And Treat – how ‘healthy eating’ is making us ill by Barry Groves.  Barry Groves has taken a close look at many studies.  Often, the abstracts on the medical journal articles do not agree with what the data presented in the article would indicate.  Also, some recommendations have no basis in research.  One of those recommendations is the Five a Day advice for fruits and vegetables.  Studies have shown that two a week is sufficient to get maximum benefit.  I like vegetables enough that I’ll keep eating them anyway.  As for fruits, they contain fructose, the most harmful of sugars.  Their value is questionable when the nutrition they contain can just as easily be gotten from vegetables.  Fructose is the sugar that causes belly fat.  Fructose is also the sugar most detrimental to the immune system, though the other simple sugars aren’t far behind.  Another source I’ve seen said that fructose is metabolized in the liver the same way that alcohol is, and we know what alcohol can do to the liver.  Table sugar and high fructose corn syrup are about half fructose, which makes them dangerous, too.  Barry Groves’ site: http://www.second-opinions.co.uk

Critique of studies on which our “healthy diet” advice is based

I just read Dr. Mercola’s critique of the principal studies on which our “healthy diet” advice is based, The Cholesterol Myths that May be Harming Your Health.  It would seem that there’s a lot of misleading information being promulgated.

To start with, Dr. Ancel Keys cherry-picked his cases for the Seven Countries Study back in 1953 when he told us that higher fat intake correlated to higher rates of coronary heart disease.  Had he used data from all 22 countries that had data available, no correlation between dietary fats and coronary heart disease would have been found.

Analysis of the Framingham Study showed that lower blood cholesterol levels were associated with a lower cardiac risk.  What they did not tell us was that the same study determined that the more cholesterol and saturated fat people ate, the lower their blood cholesterol levels.  And yet we were told to lower our cholesterol and saturated fat intakes.

And finally, while the “MrFit” Study did show a marginal decrease in coronary heart disease for those who ate a low-saturated fat and low-cholesterol diet, there was an increased all-cause mortality rate for those who followed such a diet with an increase in deaths from cancer, brain hemorrhage, suicide, and violent death.

The HCG Diet

There’s a page that lists the articles and research on the HCG Diet published in medical journals.  It’s here.  The FDA does not endorse the diet.  HCG is not approved for weight loss; however, doctors are permitted to use drugs approved for other purposes as they choose.  The HCG Diet is very strict and unforgiving of cheats.  It takes tremendous dedication to follow this diet.  Supposedly, the reward is, if followed through the stabilization phase, that one’s metabolism is reestablished so that one does not gain the weight back.

Why meat must be part of our diet

Prehistoric Hunters
Prehistoric Hunters in a Cave Painting

Vegetarians and vegans like to tell us that we should eat a largely carbohydrate diet. I disagree. They like to say that our diet should resemble that of gorillas and chimpanzees since they are supposedly our nearest evolutionary relatives. But our digestive systems are very different from theirs. Barry Groves explores those differences at length in an article on his site. Our digestive system resembles that of carnivores more than it does that of herbivores.

Dense carbohydrates are a very recent addition to the human diet. Agriculture did not occur until about 10,000 years ago; and in some areas such as northernEurope, agriculture did not arrive until about 5,000 years ago. Prior to that, humans were hunter/gatherers. Modern day hunter/gatherer diets tend to be largely meat-based with a preference for the fattiest portions. It is clear from the bone piles found at sites where prehistoric human remains have been found that the prehistoric diet included a lot of meat as well. Their cave paintings depict hunting, not agriculture. And the bones of those prehistoric humans showed that they were much healthier than us. They were taller, and they did not suffer from degenerative diseases such as arthritis. Those in the northern climates particularly would have been eating a meat diet because the ice age would not have allowed much vegetation to grow.

On the other hand, arthritis, obesity, and heart disease are apparent in Egyptian mummies, a society where grains predominated.

References:
Barry Groves. Should all animals eat a high-fat, low-carb diet? (This article compares our digestive system with herbivores and carnivores.)

High-fat diet best for weight loss

There was a study done in 1956 comparing weight loss on diets of differing macronutrient content. The diets were all 1,000 calories. One was 90% carbohydrate, another was 90% protein, another was 90% fat, with the last being a mixed diet. Those on the 90% fat diet lost the most weight, with those on the 90% protein diet coming in as a close second. Those on the 90% carbohydrate diet lost the least, and some of those even gained weight.

Reference:
A. Kekwick M.A., M.B. Camb., F.R.C.P. , G.L.S. Pawan B.Sc. Lond. Calorie intake in relation to body-weight changes in the obese. The Lancet, Volume 268, Issue 6935, Pages 155 – 161, 28 July 1956.

Does the American Heart Association know about these studies?

I continue to read Natural Health & Weight Loss by Barry Groves.  I am currently reading about fats.

A study was done in 1965 by Rose GA et al to assess survival rates in patients eating different fats and oils.  In this study, patients who had already had a heart attack were assigned to one of three groups.  These were given polyunsaturated corn oil, mono-unsaturated olive oil or saturated animal fats respectively.  Blood cholesterol levels were lowered by an average of 30% in the polyunsaturated group, while there was no change in the other two groups.  At first sight, therefore, it seemed that men in the polyunsaturated group had the best chance of survival.  However, at the end of the trial only 52% of the polyunsaturated group were still alive and free of a second heart attack.  Those in the mono-unsaturated group fared little better: 57% survived and had no further attack.  But the saturated animal fats group fared the best with 75% surviving and without a further attack.

There was also a Finnish trial published in 1985 by Miettinen TA et al in which middle aged men were given interventions such as instruction on diet, smoking, and exercise and were also treated for high blood pressure and cholesterol when present.  The control group was given no such interventions.  At the 15-year follow-up, there were 67 total deaths and 34 heart disease deaths in the intervention group.  In the control group, there were 46 total deaths and 14 heart disease deaths.

Would it be fair to say that we are being given bad advice where it relates to heart health?

References:
Barry Groves. Natural Health & Weight Loss, 2007.
Rose GA, Thomson WB, Williams RT. Corn oil in treatment of ischaemic heart disease. Br Med J. 1965 Jun 12;1(5449):1531-3.
Miettinen TA et al. Multifactorial Primary Prevention of Cardiovascular Diseases in Middle-aged Men, JAMA. 1985;254(15):2097-2102.

More reasons not to eat whole grains

I’ve known for some time that grains don’t work well for me. I was reading a Paleo Diet newsletter today and discovered another reason not to eat them. Apparently, they are associated with deficiency diseases.

Whole Grain Cereals and Vitamin D Metabolism

Nutritional scientists have known forever and a day that excessive consumption of whole grain cereals severely impairs vitamin D metabolism and can lead to the bone disease, rickets[16]. In fact, as far back as 1918, before vitamin D was discovered, a scientist in England by the name of Mellanby routinely induced experimental rickets in puppies by feeding them an oat diet[17]. Epidemiological studies of human populations consuming high levels of unleavened whole grain breads show vitamin D deficiency and rickets to be widespread[18-20]. A study of radio-labeled vitamin D in humans consuming 60g of wheat bran daily for 30 days clearly demonstrated an enhanced elimination of vitamin D in the intestines[21].

16. Cordain L. Cereal grains: humanity’s double edged sword. World Rev Nutr Diet 1999; 84:19-73.
17. Mellanby E. The part played by an “accessory factor” in the production of experimental rickets. J Physiol (London) 1918;52:11-14.
18. Gibson RS, Bindra GS, Nizan P, Draper HH: The vitamin D status of east Indian Punjabi immigrants to Canada. Brit J Nutr 1987; 58:23-29.
19. Brooke OG, Brown IRF, Cleeve HJW: Observations of the vitamin D state of pregnant Asian women in London. Brit J Obstet Gynaecol 1981;88:18-26.
20. Hunt SP, O’Riordan JLH, Windo J, Truswell AS: Vitamin D status in different subgroups of British Asians. Br Med J 1976;2:1351-54.
21. Batchelor AJ, Compston JE: Reduced plasma half-life of radio-labeled 25-hydroxyvitamin D3 in subjects receiving a high fiber diet. Brit J Nutr 1983;49:213-16.

Rethinking dietary advice

What if popular dietary advice was just plain wrong? Mainstream dietary thinking tells us that the number of calories in must balance the number of calories out. They tell us that the best way to make sure that the number of calories in is less than or equal to the number of calories out is to decrease our fat intake. They tell us that we should balance our diet with a certain amount of complex carbohydrates. They tell us that exercise can also alter the equation of calories in versus calories out. So what if all that was just plain wrong? What if the real cause of overweight was metabolic disturbance caused by an imbalance of hormones?

I am currently reading Good Calories, Bad Calories: Fats, Carbs, and the Controversial Science of Diet and Health by Gary Taubes which proposes exactly that theory. I am further inclined to believe that metabolic disturbance theory given my own anecdotal experiences. Firstly, I have been diagnosed with bipolar disorder and have consequently been prescribed various medications to treat that. Fortunately, these medications have been effective in controlling the bipolar disorder, but they have also led to side effects, most notably with some of the medications, weight gain. The worst of these medications for me was Depakote, an anti-seizure medication. I gained crazy amounts of weight on this medication without corresponding dietary alteration, so much so that I told my doctor to change the medication or he would have a noncompliance problem on his hands.

More recently, our dog was diagnosed with epilepsy, and Phenobarbital was prescribed to her. Before her seizure episodes and consequent prescription, we were able to feed her as much food as she wanted without her gaining weight. After she started her medication, she started gaining weight on much less food. At first, we cut back on her food to the level prescribed on the back of the bag. When she continued to gain weight, we consulted her vet and decided upon an amount of food that was even less than is typical for an active dog like her at her weight. We have since been able to control her weight at this lower consumption. Given that she is still an active dog and yet must eat less than her peers, we must assume that her medication causes some sort of metabolic disturbance.

In the book, Good Calories, Bad Calories, Gary Taubes puts forward the theory that overweight is caused by excess insulin. Excess insulin, in turn, is caused by excess carbohydrate in the diet. When carbohydrate is restricted, weight loss occurs even when calories are not restricted. The author cites studies in which carbohydrate restricted diets exceeded 3,000 calories a day and yet weight loss still occurred. Actually, they had difficulty getting their subjects to eat this amount of non-carbohydrate food, not due to boredom as has been postulated, but because the subjects had no appetite for higher consumption. Modern dietary advice tells us that all calories are created equal. Gary Taubes puts forward that this is not the case. Carbohydrates are uniquely fattening because they increase the secretion of insulin. Insulin drives the blood sugar into adipose tissue, often depriving the muscle tissue of that energy. This leads to increased food cravings, which are often satisfied with additional carbohydrates. This leads to a vicious cycle in which carbohydrates are consumed to offset an energy deficit that is redirected to the fat instead.

So let’s go back to my medications, particularly the Depakote. So why did Depakote cause such weight gain even though my dietary intake had not increased, and in fact, I was trying desperately to control my weight? As it turns out, Depakote is associated with hyperinsulinemia, which is an overproduction of insulin. Phenobarbital is likewise associated with changes in glucose metabolism. Given these effects, it is not surprising that both I and the dog would gain weight when prescribed these medications.

Recently, Woman’s World published an article promoting the use of coconut or MCT oil for weight loss. I did a little research to look into this further and found out that MCT oil is most effective for weight loss when associated with a ketogenic diet. This is a diet severely restricted in carbohydrates and high in fat. I did a little bit more research and found out that a ketogenic diet is often prescribed to epileptics. I found this particularly interesting because anti-seizure medications are often prescribed to bipolar patients. I wondered if maybe the ketogenic diet had been found effective in treating bipolar disorder. Particularly, I wanted to know if there was any contra-indication advising against a bipolar patient following a ketogenic diet. I found out that the ketogenic diet had been effective in animal studies of bipolar disorder, but that human studies have not been done. Stanford University wanted to conduct a study of the ketogenic diet for bipolar patients, but was unable to find participants for its study. Given what I have read and given my experience, I am ready to be a guinea pig for such a study.