Sorry for the Big McLargeHuge post, but I did put some real time and effort into this.
So read it!
Quote:
Originally Posted by ReginaW
You asked....
(...)
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Thanks for the info. I thought you meant decades-long studies on patients, as in long-term study data, but this is still interesting.
So, I have taken some time today to dig into these cites, and find the text. I don't have time to read all of them, so I've just picked a few out. First I just highlighted a section and was picking titles out of that, then I broadened and picked some because the titles sounded relevant, or interesting to me personally (like the Bantu one). Everything I picked is listed.
I would like to invite other readers of this thread to do the same, and pick out some titles to look up. If you find the text online, please provide a link to it.
A high-carb, modified-fat diet
may therefore have an advantage over a low-carb diet? The high carb was 203 g and the low carb was 150 g! High carb for newly-diagnosed diabetics improves insulin sensitivity!?
This openly contradicts your pro-low-carb position. This is not evidence of th good health of low-carb diets. Are you sure you wanted to cite this?
I can't find the article via the journal site, and anyway I don't speak Spanish (or Portuguese) but I'm game to run it through Babelfish. I don't think the online archive goes back far enough, though. I can't find the author's name in the list.
"Contraindications" means that the study found reasons NOT to use low-carb diets in certain diabetics, anyway. That sounds like it doesn't support your assertions, but I'm willing to read it. Do you have translated text available?
Quote:
Comparative studies on the effect of high carbohydrate diet and low carbohydrate diet in diabetes]
Pol Tyg Lek. 1969 Oct 3;24(44):1697-700
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This one's in Polish, and I can't find the text - I don't know Polish enough to even find an online host for the journal. You have read this? Where did you find it?
But I do have to say, the author is not an MD and is a proponent of "balneotherapy" so I'm not sure how seriously I should take her anyway. I will try to be open-minded.
I can't find the full text online. The archive only appears to go back to 2004. There isn't an abstract either. What did this say?
This was a scanned-in PDF so I could not select text, but here's a snapshot of the summary:
That study is about elevated blood lipids on low-carb! It doesn't say low-carb shouldn't be used, but that the 'hazards' should be considered.
It mildly contradicts your position, certainly doesn't support it.
This is mildly positive in that it indicates something about how high carb intake can lead to higher blood lipids. However, it was a short (one-week) study, looking for a specific pancreatic action, and it shows correlation, not causation.
This at least starts to support your assertions. However, it was
published in the ADA's own journal. Can it be said they are 'withholding' this evidence?
Quote:
Regression of xanthomas in endogenous hypertriglyceridemia under low carbohydrate diet]
Hautarzt. 1977 Dec;28(12):648-52
Report on two patients with endogenous hypertriglyceridemia. In both patients normal serum lipid values were reached in a comparatively short time under a diet with reduced carbohydrates and calories. In one diabetic patient who needed insulin at the beginning of the treatment the disease could be controlled by dietary measures alone after a few days. Different biological half-life periods of the various serum lipid fractions explain why, under a reducing diet, the rate of decrease of lipids is variable according to the respective component. Thus, the ratio of triglycerides and cholesterol can vary in the same patient within a few days and may change his classification under different types of hyperlipidemia according to Fredrickson.
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This sounds positive, about fast changes in triglycerides and cholesterol. But the abstract provided doesn't say much, and I can't find the full text as the online archive only goes back to 1994. Also, 'Hautarzt' is 'skin doctor.' This is from a dermatology journal (xanthomas are fatty skin deposits). This does sound interesting in the realm of blood lipids, but it's hard to draw any strong conclusions without knowing how long the study was ('short time' and 'few days' indicate it may have been short), how low-carb the diet was, and so on.
Quote:
Thematic review series: patient-oriented research. Dietary fat, carbohydrate, and protein: effects on plasma lipoprotein patterns.
J Lipid Res. 2006 Aug;47(8):1661-7
Short-term data favor substituting protein and fat for carbohydrate, whereas long-term data have failed to show a benefit for weight loss. During an active weight loss period low-carbohydrate diets more favorably affect triglyceride and HDL and less favorably affect LDL cholesterol concentrations. Additional efforts need to be focused on gaining a better understanding of the effect of dietary macronutrient profiles on established and emerging cardiovascular disease risk factors, mechanisms for changes observed and contributors to individual variability. Such data are needed to allow reassessment and, if necessary, modification of current recommendations.
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It is difficult to isolate the independent effects of dietary fat, carbohydrate, and protein on plasma lipoprotein profiles. The data available are confounded by changes in body weight and alterations in the intake of two or more macronutrients necessitated to minimize body weight changes. Given the high degree of variability in response among individuals, specific recommendations for dietary fat, carbohydrate, and protein to optimize plasma lipoprotein patterns need to be made on a case-by-case basis, taking into consideration a realistic anticipated level of compliance. A considerable amount is known about the effect of fatty acid subclasses, and in some cases individual fatty acids, on plasma lipoprotein patterns and the metabolic basis for these effects. Additional efforts need to be focused on gaining a better understanding of the effect of the macronutrient content of the diet on established and emerging CVD risk factors other than lipoprotein patterns,
understanding the mechanisms associated with diet induced changes in lipoprotein patterns and contributors to individual variability in response, and then to reassess and if necessary modify current recommendations.
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This is a good read. It's not a study, but a review of data. She thinks we should update dietary recommendations based on science, but concludes that more research is needed before recommending low-carb across the board. It also mentions 'realistic anticipated level of compliance,' which is something we've mentioned in the thread. It's dated 2006. So that actually supports what the ADA says: more research is needed.
I wouldn't say it supports your assertions.
Can't find the text - online archive only goes back to 2002. You have the text?
There's no really good short text to quote, but this study found in favor of a higher-carb, high-fiber diet compared to a lower-carb, lower-fiber one, because it lowers fasting blood plasma glucose over 2-3 weeks. The low-carb diet wasn't very low-carb, around 30% of diet (high was 60% of diet).
This contradicts your pro-low-carb position.
Quote:
The effect of sucrose content in high and low carbohydrate diets on plasma glucose, insulin, and lipid responses in hypertriglyceridemic humans.
J Clin Endocrinol Metab. 1984 Oct;59(4):636-42
To further understand the effect of high carbohydrate (CHO)-low fat diets and the role of variations in dietary sucrose on CHO and lipid metabolism, 10 patients with hypertriglyceridemia were fed 2 isocaloric, typical American diets, containing 40% and 60% CHO, for 15 days in random sequence. Each patient was their own control, and they were divided into 2 groups of 5 patients each. In one group, sucrose was held constant at 13% of total calories (40-13% and 60-13%), whereas the sucrose content was 9% of the total calories on a 40% CHO diet (40- 9%), and 15% of total calories on a 60% CHO diet (60-15%) in the other group. Fasting and postprandial blood samples were analyzed for plasma glucose, insulin, cholesterol (Chol), and triglycerides (TG), as well as for Chol and TG in chylomicrons, very low density, low density, and high density lipoproteins (HDL). Fasting plasma TG levels were significantly increased in both groups on the 60% CHO diet, primarily due to increases in very low density-TG concentration. The magnitude of the elevation was attenuated when sucrose content was kept constant. Postprandial TG responses were qualitatively similar. There were no significant changes in plasma Chol concentrations, except for a modest fall in plasma HDL-Chol level after the 60-13% diet period (P less than 0.05). No significant differences were found in fasting plasma glucose or insulin concentration. However, postprandial glucose and insulin responses were increased on both high CHO diets. The results of these studies demonstrate that high CHO-low fat diets, in general, tend to elevate plasma glucose, insulin, and TG concentrations and reduce HDL- Chol concentration in patients with endogenous hypertriglyceridemia. In addition, these data illustrate the important role that small variations in dietary sucrose can play in modulation of CHO and lipid metabolism.
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All I can get online is the abstract, so let me know if the text provides more interesting details. Based on the abstract, this one does sound very good, though. In people who have high triglycerides, a very high carb diet with lots of sucrose makes them worse. This was a 15-day study, that is not very long-term.
Also, this says nothing about going particularly low-carb for positive effect, it merely indicates negative results from going very high-carb with a certain amount of sucrose in the daily diet. This does not go very far in supporting your position, but it's on the positive side.
One more makes a dozen:
Quote:
Effect of carbohydrate restriction and high carbohydrates diets on men with chemical diabetes.
Am J Clin Nutr. 1977 Mar;30(3):402-8
The influence of low carbohydrate (CHO) diets, starvation, and high CHO diets on glucose tolerance tests (GTT) and plasma insulin response of men with chemical diabetes was studied. The GTT and insulin responses of these seven lean diabetic men were unchanged when the carbohydrate content of the diet was reduced from 44 to 20% of calories. After a 48-hr fast a significant deterioration of the GTT was observed in these diabetic men but the percentage change was identical to that reported previously for normal men. Thus these studies indicate that changes in glucose mtes are quite similar to those reported previously for normal men. The fasting plasma glucose values of seven lean and four obese men with chemical diabetes were significantly lower after one week on a 75% CHO diet than values on a 44% CHO diet. The 75% CHO diet also was accompanied by slight improvements in the oral and intravenous GTT and by slightly lower plasma insulin responses. The improvement in glucose metabolism on high CHO diets appears to results from increased insulin sensitivity. Serum triglyceride values were approximately 55% higher on the 75% CHO diet than values on the 44% CHO diet for the 11 men but these differences were not statistically significant. These studies support previous observations and suggest that high CHO diets may be beneficial in the management of certain diabetic patients. However, further studies are required to determine the long-term effects of high CHO diets containing natural foods on the glucose and lipid metabolism of diabetic patients.
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High carbohydrate diets may be beneficial in the management of certain diabetic patients?!
This is another scanned document, so here's a GIF from the summary:
This
certainly doesn't agree with the position you're taking.
Maybe that's only 12 pulled out of what, 250 or so? So, that's nearly 5% and I tried to somewhat randomize my choices. Out of this random-ish sample:
- Five seem to contradict your position (as I understand it)
- Three seem to support your position, out of which
- One was published by the ADA themselves (so they are not 'withholding' it)
- One was a dermatology study (and no full text yet)
- One merely said not to eat lots of sugar
- Four I was unable to read (I'd be happy to if I can get the text)
I was going on the assumption you had evaluated these things you cited. But now I'm not so sure...have you read them? Especially these ones in remote foreign journals!