Category Archives: Protein

What’s the Optimal Diet for Type 1 Diabetes?

A mess of Bacon Bit Brussels Sprouts: 6 grams of fiber per serve

Dr. Muccioli over at Diabetes Daily posted a brief article on a recent research study. A snippet:

The authors found that a higher intake of fiber was associated with lower average blood glucose values. In contrast, a higher intake of carbohydrate, alcohol, and monounsaturated fat was negatively associated with glycemic control (these patients typically experienced more variability in their blood glucose levels). Finally, the analysis revealed that “substituting proteins for either carbohydrates, fats, or alcohol, or fats for carbohydrates, were all associated with lower variability in the measured blood glucose values.”

Source: Which Dietary Patterns Are Best for Type 1 Diabetes Control? – Diabetes Daily

Eaton and Konner figured the Paleolithic diet provided over 70 g/day of fiber. How much are we in the West eating now? Something like 15–20 grams.

Steve Parker, M.D.

Click pic to buy book at Amazon.com

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Which Macronutrient Helps the Most With Appetite Control and Weight Management?

You can make a good case for protein. Julianne Taylor has the sciencey details in a fine post at her blog. She talks about insulin, glycogen, digestion, glycemic index, and the benefits of vegetable and fruit carbohydrates over grains.

Read the whole enchilada.

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Large Breakfast Rich in Protein and Fat Beats a Small Breakfast Strategy in Type 2 Diabetes

…according to research reported at MedPageToday.  This was a relatively small study with about 30 participants in each treatment arm. A snippet:

Patients in the big-breakfast group were instructed to consume 33% of their daily calories in their morning meal — that included up to 30% protein, up to 37% fat, and the rest in carbohydrates. Patients in the small-breakfast group were instructed to consume 12.5% of their daily calories at breakfast — with up to 70% in the form of carbohydrates.

Average fasting glucose decreased 14.51 mg/dL in the big breakfast group and decreased 4.91 mg/dL in the small breakfast group (P=0.011), she said at the annual meeting of the European Association for the Study of Diabetes.

The big breakfast group also saw a significant drop in systolic blood pressure (almost 10 mmHg), although probably not to the point it created a problem.

Read the whole enchilada.

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Filed under Fat in Diet, Protein

Do You Worry About Eating Too Much Meat?

If so, read the interesting essay by Dr. Georgia Ede on the health of traditional heavy meat-eating cultures such as the Masai and Inuits.

Of the Canadian Eskimos of a century ago, Dr. Ede writes:

Their diets were therefore extremely low in fiber most of the time, and very high in animal protein and animal fat.  These traditional ways of eating would terrify the USDA, the American Heart Association, the American Cancer Society, not to mention the Harvard School of Public Health, which remains a staunchly anti-meat, anti-saturated fat, anti-cholesterol institution.  How in the world did these uninformed fringe types manage to get all their vitamins and minerals without the heaping helpings of colorful fruits, vegetables, and whole grains without which we are told we shall surely perish?

Weren’t they cancer-riddled, heart-clenching, constipated, fat slobs who died young from scary deficiency diseases like rickets and scurvy?

[Apparently not.]

This post was not designed to provide an airtight argument for meat and health, but I do hope that it has at least prompted those of you who remain skeptical about meat to rethink what you’ve been led to believe. If you’ve got a hankerin’ for more information about meat and health, take a look at my meat page.

Check it out.

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Is Low-Carb Killing Swedish Women?

MPj04384870000[1]A recent Swedish study suggests that low-carbohydrate/high protein diets increase the risk of cardiovascular disease in women.  I’m not convinced, but will keep an eye on future developments.  This is a critical issue since many women eat low-carb/high protein for weight loss and management.

Researchers followed 43,000 women, 30-49 years of age at enrollment, over the course of 16 years.  In that span, they had 1270 cardiovascular events: ischemic heart disease (heart attacks and blocked heart arteries), strokes, subarachnoid hemorrhages,  and peripheral arterial disease.  Food consumption was estimated from a questionnaire filled out by study participants at the time of enrollment (and never repeated).

In practical terms, … a 20 gram decrease in daily carbohydrate intake and a 5 gram increase in daily protein intake would correspond to a 5% increase in the overall risk of cardiovascular disease.

So What?

To their credit, the researchers note that a similar analysis of the Women’s Health Study in the U.S. found no such linkage between cardiovascular disease and low-carb/high protein eating.

The results are questionably reliable since diet was only assessed once during the entire 16-year span.

I’m certain the investigators had access to overall death rates.  Why didn’t they bother to report those?  Your guess is as good as mine.  Even if low-carb/high protein eating increases the rate of cardiovascular events, it’s entirely possible that overall deaths could be lower, the same, or higher than average.  That’s important information.

I don’t want to get too far into the weeds here, but must point out that the type of carbohydrate consumed is probably important.  For instance, easily digested carbs that raise blood sugar higher than other carbs are associated with increased heart disease in women.  “Bad carbs” in this respect would be simple sugars and refined grains.

In a 2004 study, higher carbohydrate consumption was linked to progression of blocked heart arteries in postmenopausal women.

It’s complicated.

Steve Parker, M.D.

PS: I figure Swedish diet doctor Andreas Eenfeldt would have some great comments on this study, but can’t find them at his blog.

Reference: Lagiou, Pagona, et al.  Low carbohydrate-high protein diet and incidence of cardiovascular diseases in Swedish women: prospective cohort study.  British Medical Journal, June 26, 2012.  doi: 10.1136/bmj.e4026

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Filed under Carbohydrate, coronary heart disease, Heart Disease, Protein

Does Dietary Protein Affect Blood Sugars?

The protein in this can raise your blood sugar

I’m considering whether I should advise my patients with diabetes to pay careful attention to the protein content of their diet, assuming they’re not malnourished.  It’s an important issue to Dr. Richard K. Bernstein, who definitely says it has to be taken into account.

Protein can undoubtedly raise blood sugar levels.  But is the effect clinically significant?  Most  dietitians and physicians pay little attention to it as a source of hyperglycemia.  Here are some of Dr. Bernstein’s ideas pulled from the current edition of Diabetes Solution:

  • The liver (and the kidneys and intestines to a lesser extent) can convert protein to glucose, although it’s a slow and inefficient process.
  • Since the conversion process—called gluconeogenesis—is slow and inefficient, diabetics don’t see the high blood sugar spikes they would see from many ingested carbohydrates.
  • For example, 3 ounces (85 g) of hamburger patty could be converted to 6.5 g of glucose under the right circumstances.
  • Protein foods from animals (e.g., meat, fish, chicken, eggs) are about 20% protein by weight.
  • Dr. B recommends keeping protein portions in a particular meal consistent day-to-day (for example 6 ounces with each lunch).
  • He recommends at least 1–1.2 g of protein per kilogram of ideal body weight for non-athletic adults.  That’s more than the usual 0.8 g per kilogram.
  • The minimum protein he recommends for a 155-lb non-athletic adult is 11.7–14 ounces daily.
  • Growing children and athletes need more protein.
  • Each uncooked ounce of the foods on his “protein foods” list (page 181) provides about 6 g of protein.
  • On his eating plan, you choose the amount of protein in a meal that would satisfy you, which might be 3 ounces or 6–9 ounces.
  • If you have gastroparesis, however, you should limit your evening meal protein to 2 ounces of eggs, cheese, fish, or ground meat, while eating more protein at the two earlier meals in the day.

“In many respects—and going against the grain of a number of the medical establishment’s accepted notions about diabetics and protein—protein will become the most important part of our diet if you are going to control blood sugars just as it was for our hunter-getherer ancestors.”

Conclusions

I haven’t changed my thinking on this issue yet, but will let you know if and when I do.  I don’t talk much about protein in Conquer Diabetes and Prediabetes in part because I wanted to keep the program simpler than Dr. Bernstein’s.  Albert Einstein reportedly said, “Everything should be made as simple as possible, but not simpler.”

As with most aspects of diabetes, your mileage may vary.  The effect of dietary protein on blood sugars will depend on type 1 versus type 2 diabetes, and will vary from one person to another.  So it may be impossible to set rigid guidelines.

If interested, you can determine how much protein is in various foods at NutritionData.

Steve Parker, M.D.

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Which Of Three Low-Carb Diets Reduces Future Risk of Diabetes?

Men eating low-carb diets featuring protein and fats from sources other than red and processed meats may reduce risk of developing type 2 diabetes later, compared to other types of low-carb diets.  The same Boston-based researchers previously looked for a similar association in women and found none.

The article in American Journal of Clinical Nutrition seems to me unusually complicated, like the first sentence of this post.  It was frustrating to read, searching for but not finding much useful for clinical practice.  How low-carb were these diets?  Thirty-seven to 43% of energy from carbs in the most dedicated dieters, compared to 50-60% in the standard American diet.

After wading through most of this article, I came away with the impression the authors were just data-mining a huge database, to add one more item to their CVs (curriculum vitae).  This article is a confusing mess, or maybe I’m just stupid. I regret wasting an hour on it.

Steve Parker, M.D.

Reference: De Konig, Lawrence, et al.  Low-carbohydrate diet scores and risk of type 2 diabetes in menAmercan Journal of Clinical Nutrition, 2011. doi: 10.3945/ajcn.110.004333

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Filed under Causes of Diabetes, Fat in Diet, Protein

High-Protein Diets Harmful to Bones? Nah!

Contrary to accepted wisdom, high  protein intake does not seem to be harmful to mineralization of bone, according to Seattle-based researchers reporting in the American Journal of Clinical Nutriton.  Mineralization of bone is important because higher bone mineral content generally translates to lower risk of fractures.

A consistent criticism of low-carbohydrate diets in the past is that they are detrimental to bone health.  How so?  If you reduce carb consumption, you have to replace at least some of the calories with either fat or protein.  Some low-carb diets lean towards higher protein content, others towards higher fat, still others increase both fat and protein.  The building blocks of proteins are amino acids, and some amino acids are acidic.  Acid-rich biochemical states may promote removal of calcium from bone and, ultimately, loss of that calcium in urine.  The calcium-poor bones are more prone to fracture.

If that theory is correct, women eating greater amounts of protein should demonstrate lower bone mineralization.  [The primary bone minerals are calcium and phosphorus.] 

ResearchBlogging.orgInvestigators tested the theory in 560 women aged 14 to 40 by measuring bone mineral density (via DEXA scans) over two or three years and monitoring food consumption via yearly questionnaires.  This was an observational study, not interventional.

They found that bone mineral density had nothing to do with protein consumption.  Higher protein intake was not associated with lower bone density.

Women in the low-protein group ate 52 g of protein daily, compared to 63 g in the medium group and 77 g in the high-protein tertile.  As best I can tell, the low-protein third of participants ate 12% of total calories as protein, compared to 20% in the high-protein third.  [Study authors could have put this in the appropriate table, but, mysteriously, opted against that.]

Caveats

We can’t tell from this study whether these findings apply to protein intakes outside this range, to men, or to women older than 40.  To their credit, the study authors review much of the pertinent literature and note that research in this area produces results all over the map.  To me, this suggests that the association between dietary protein and bone mineralization in the general population is weak, if not nonexistent.

Bottom Line

Looks like you can stop worrying so much about hurting your bones if you’re on a low-carb, high-protein diet.

Steve Parker, M.D.

Reference: Beasley, J., Ichikawa, L., Ange, B., Spangler, L., LaCroix, A., Ott, S., & Scholes, D. (2010). Is protein intake associated with bone mineral density in young women? American Journal of Clinical Nutrition, 91 (5), 1311-1316 DOI: 10.3945/ajcn.2009.28728

 

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Is a Low-Carb Diet Safe For Obese Adolescents?

High-protein, low-carbohydrate diets are safe and effective for severely obese adolescent, according to University of Colorado researchers.

Childhood obesity in the U.S. tripled from the early 1980s to 2000, ending with a 17% obesity rate.  Overweight and obesity together describe 32% of U.S. children.  Some experts believe this generation of kids will be the first in U.S. history to suffer a decline in life expectancy, related to obesity.

Colorado researchers wondered if a low-carb, high-protein diet is a reasonable treatment option.  Why high protein?  It’s an effort to preserve lean body mass (e.g., muscle). 

ResearchBlogging.orgThey randomized 46 adoloscents (age 12–18) to either a high-protein, low-carb diet (HPLC diet) or a calorie-restricted low-fat diet to be followed for 13 weeks.  HPLC dieters could eat unlimited calories as long as they attempted to keep carb consumption to 20 g/day or less.  Low-fat dieters were to choose lean protein sources, aiming daily for 2 to 2.5 grams of protein per kilogram of ideal body weight.  Study participants underwent blood analysis and body compositon analysis by dual x-ray absorptiometry.  These kids weighed an average of 108 kg (238 lb) and average body mass index was 39. 

Analysis of food diaries showed the following:

  • Average caloric intake was 1300-1450/day, toward the lower end for the HPLC dieters
  • Energy composition of the HPLC diet: 32% from protien, 11% from carb, 57% from fat
  • Energy compositon of the LF diet: 21% from protein, 51% from carb, 29% from fat
  • Average daily carb consumption for the HPLCers ended up closer to 40 g (still very low) 

Findings

Both groups lost weight, with the HPLC dieters trending to greater weight loss, but not to a statistically significant degree.  They did, however, show a greater drop in body mass index Z-score, however.  Study authors didn’t bother to explain “body mass index Z-scores,” assuming I would know what that meant.  Average weight in the HPLC group dropped 13 kg (29 lb) compared to 7 kg (15 lb) in the low-fat group.

Total and LDL cholesterol fell in both groups, and insulin resistance improved.  Neither diet had much effect on HDL cholesterol.

As usual, triglycerides fell dramatically in the HPLC dieters.

Nearly 40% of the kids—about the same number in both groups—dropped out before finishing the 13 weeks.

The HPLC group did not see any particular preservation of lean body mass, and actually seemed to lose a bit more than the low-fat group.

There were no serious adverse effects in either group. 

Surprisingly, satiety and hunger scores were the same in both groups.  [Low-carb, ketogenic diets have a reputation for satiation and hunger suppression.]

My Comments

This is a small short-term study with a large drop-out rate; we must consider it a pilot study.  That’s why I’m not as enthusiastic about it as the researchers.  Nevertheless, it does indeed suggest that high-protein, low-carb diets are indeed safe and effective in obese adolescents.  It’s a start.   

Steve Parker, M.D.

Reference: Krebs, N., Gao, D., Gralla, J., Collins, J., & Johnson, S. (2010). Efficacy and Safety of a High Protein, Low Carbohydrate Diet for Weight Loss in Severely Obese Adolescents The Journal of Pediatrics, 157 (2), 252-258 DOI: 10.1016/j.jpeds.2010.02.010

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Filed under Carbohydrate, Fat in Diet, ketogenic diet, Protein, Weight Loss

Book Review: Diabetes Solution – The Complete Guide to Achieving Normal Blood Sugars

Here’s my review of Dr. Bernstein’s Diabetes Solution: The Complete Guide to Achieving Normal Blood Sugars, published in 2007.  Per Amazon.com’s rating scale, I give it five stars (I love it).  

♦   ♦   ♦ 

Dr. Richard K. Bernstein gives away thousands of dollars’ worth of medical advice in this masterpiece, Diabetes Solution.  It’s a summation of his entire medical career and a gift to the diabetes community.  

The book starts off with some incredible testimonials: reversal of diabetic nerve damage, eye damage, and erectile dysfunction.  They’re a bit off-putting to a skeptic like me, like an infomercial.  Dr. Bernstein is either lying about these or he’s not; I believe him.  His strongest testimonial is his own.  He’s been a type 1 diabetic most of his life, having acquired the disease at a time when most type 1’s never saw 55 candles on a birthday cake.  He’s in his mid-70s now and still working vigorously.  

I only found one obvious error and assume it’s a misprint. He writes that 95% of people born today in the U.S. will eventually develop diabetes.  That’s preposterous.  The U.S. Centers for Disease Control predicts that one in three born in 2000 will be diagnosed.  

Dr. Bernstein delivers lots of facts that I can neither confirm nor refute.  He’s a full-time diabetologist; I am not.  

"Put down the bread and no one will get hurt!"

  

The central problem in type 1 diabetes is that, due to a lack of insulin,  ingested carbohydrates lead to spikes (elevations) in blood sugar.  The sugar elevations themselves are toxic.  The usual insulin injections are not good imitators of a healthy pancreas gland. So Dr. Bernstein is an advocate of low-carb eating (about 30 g daily compared to the usual American 250-300 g).  He says the available insulins CAN handle the glucose produced by a high-protein meal.  

Dr. B reminds us that insulin is the main fat-building hormone, which is one reason diabetics gain weight when they start insulin, and why type 2 diabetics with insulin resistance (and high blood insulin levels) are overweight and have trouble losing weight.  You can have resistance to insulin’s blood sugar lowering action yet no resistance to its fat-building (fat-storing) action.  Insulin also stimulates hunger, so insulin-resistant diabetics are often hungry.  

“Carbohydrate counting” is a popular method for determining a dose of injected insulin.  Dr. B says the gram counts on most foods are only a rough estimate—far too rough.  He minimizes the error by minimizing the input (ingested carbs).  From his days as an engineer, he notes “small inputs, small mistakes.”  

Dr. B also cites problems with the absorption of injected insulin.  Absorption is variable: the larger the dose, the greater the variability.  So don’t eat a lot of carbs that require a large insulin dose.  For adult type 1 diabetics, his recommended rapid-acting insulins doses are usually three to five units.  If a dose larger than seven units is needed, split it into different sites.  

He recommends diabetics aim for normal glucoses (90 mg/dl or less) almost all the time, and hemoglobin A1c of 5% or less.  This is extremely tight control, tighter than any expert panel recommends.  He says this is the best way to avoid the serious complications of diabetes.   

Here’s a smattering of “facts” in the book that made an impact on me, a physician practicing internal medicine for over two decades.  I want to remember them, incorporate into my practice, or research further to confirm:  

  • Hemoglobin A1c of 5% equals an average blood sugar of 100 mg/dl (5.56 mmol/l).  For each one % higher, average glucose is 40 mg/dl (2.22  mmol/l) higher.
  • He’s against any drugs that overstimulate (“burn out”) the remaining pancreas function in type 2 diabetics: sulfonylureas, meglitinides, “phenylalanine derivatives”.  Pancreas-provoking agents cause hypoglycemia and destroy beta cell function.
  • The insulin sensitizers are metformin and thiazolidinediones.  He likes these.
  • Blood sugar normalization in type 2 diabetes and early-stage type 1 can help restore beta cell function.
  • He often speaks of preserving beta cell function.
  • He believes in “insulin-mimetic agents” like alpha lipoic acid (especially R-ALA, and take biotin with either form) and evening primrose oil.  These  are no substitute for insulin injections but allow for lower insulin doses.  ALA and evening primrose oil don’t promote fat storage like insulin does.
  • He says many cardiologists take ALA for its antioxidant properties [news to me]
  • He says rosiglitazone works within two hours [news to me] but later admits it may take 12 weeks to see maximal benefit
  • One of his goals is to preserve beta cell function if at all possible
  • He prefers rosiglitazone over pioglitazone due to fewer drug interactions
  • “Americans are fat largely because of sugar, starches, and other high-carbohydrate foods.”
  • He’s convinced that people who crave carbohydrates have inherited the problem, which also predisposes to insulin resistance and type 2 diabetes.  Low-carb diets decrease the cravings for many, in his experience.
  • In small amounts, alcohol is relatively harmless: dry wine, beer, spirits.  Very few doctors have the courage to say this.
  • If you’re in a restaurant, you can use urine sugar test strips and saliva to test for presence of sugar or flour in food
  • A rule of thumb: one gram of carbohydrate will raise blood sugar about 5 mg/dl (0.28  mmol/l) or less for most diabetic adults weighing 140 lb (64  kg) and about 2.5 mg/dl (0.139 mmol/l) in a 280-pounder (127  kg).  This must refer to type 1 diabetics or a type 2 with little residual pancreas beta cell function; variable degrees of insulin resistance and beta cell reserve in many type 2s would make this formula unreliable.
  • Be wary of maltodextrin in Splenda: it does raise blood sugar.
  • Much new to me in his section on artificial sweeteners.  Be wary of them.
  • He avoids all grains, breads, crackers, barley, oats, rice, and pasta.
  • Most diet sodas are OK.
  • Coffees with 1-2 tsp milk is OK.  Cream is OK.
  • He eats NO fruit and recommends against it.
  • He avoids beets, corn, potatoes, and beans. A slice of tomato in one cup of salad is OK.  A small amount of onion is OK.
  • String beans and snow peas are OK.
  • Cooked vegetables tend to raise blood sugar more rapidly than raw.
  • Use “Equal” aspartame tabs as a sweetener.  Don’t use “powdered” Splenda.
  • Avoid nuts: too easy to overeat.
  • For desert: sugar-free Jell-O Brand Gelatin.
  • Yogurt?  Plain, whole milk, unsweetened.  Flavor with cinnamon, Da Vinci syrups, baking flavor extracts, stevia or Equal.
  • Avoid balsamic vinegar.
  • Need fiber?  Bran crackers or soybean products.
  • “Ideally, your blood sugar should be the same after eating as it was before.”  85 mg/dl (4.72  mmol/l) is his usual goal.  If blood sugar rises by more than 10 mg/dl (0.56 mmol/l) after a meal, either the meal has to be changed or medication changed.
  • Protein is a source of glucose: keep protein amounts at meals constant from day to day, especially if taking glucose-lowering drugs.
  • The lowest-carb meal of the day should be breakafast.  Why?  Dawn phenomenon.
  • He promotes strenuous, prolonged exercise, especially weight training (extensive discussion and instruction in book).
  • Many diabetics on insulin need dose adjustments in 1/2 and 1/4 unit increments [news to me: if I ordered 4 and 1/4 units of insulin at the hospital, the nurses would laugh].
  • Typical rapid-acting insulin doses for his adult type 1 patients are 3-5 units.  The “industrial doses” of insulin seen or recommended by many physicians reflect diets too high in carbohydrate.
  • He says Lantus only acts for nine hours (nighttime injection) or 18 hours (AM injection).
  • He doesn’t like mixed insulins (e.g., 70/30).
  • Humalog and Novolog are more potent than regular insulin, so the dose is about 2/3 of the regular insulin dose
  • “Only a few of the 20 available [home glucose monitoring] machines are suitably accurate for our purposes.”  “None are suitably accurate or precise above 200 mg/dl [11.11 mmol/l].”
  • Vitamin C in doses over 250 mg interferes with fingertip glucose monitors.  Later he says doses over 500 mg cause falsely low readings.
  • He prefers regular insulin (45 minutes before meal) over Novolog and Humalog, because of its five-hour duration of action.
  • Insulin users need to check glucose levels hourly while driving.
  • His personal basal insulin is 3 units Lantus twice daily.
  • He urges use of glucose (e.g., Dextrotabs) to correct hypoglycemia.
  • He says hypoglycemia is rare on his regimen.
  • He has an entire chapter on gastroparesis.

Dr. Bernstein’s recommended eating program in a nutshell:  

  • Some similarities to the Atkins diet, which he never mentions.
  • No simple sugars or “fast-acting” carbs like bread and potatoes, because even type 2s have impaired or nonexistent phase 1 insulin response.
  • Limit carbs to an amount that will work with your injected insulin or your remaining phase 2 insulin response, if any.
  • “Stop eating when you no longer feel hungry, not when you’re stuffed.”
  • Follow a predetermined meal plan (each meal: same grams of carb and ounces of protein)
  • Six g (or less) of carbs at breakfast, 12 g (or less) at lunch and evening meal.  So his patients count carb grams and protein ounces.
  • Supplements are not required IF glucoses are controlled and eating a variety of veggies.  Otherwise you may need B-complex or multivitamin/multimineral supplement.
  • Recipes are provided.

His has four basic drug treatment plans, tailored to the individual.  They are outlined in the book.  Dr. B provides detailed notes on what he does with his personal patients.  

Overall impressions:  

  • Too complicated for most, and they won’t give up higher carb consumption.  It requires a high degree of committment and discipline.  In fact, I’ve never had a patient tell me they were on the Bernstein program.
  • If I had type 1 diabetes, I might well follow his plan or the Low-Carb Mediterranean Diet, NOT the high-carb diet recommended by the ADA and many dietitians.
  • And if I had type 2 diabetes?  Low-Carb Mediterranean Diet first, Diabetes Solution as second choice.
  • If one can get his hemoglobins A1c down to 5% with other methods, would that be just as good?  Dr. B would argue that all other methods have blood sugar swings that are too wide.
  • Many new ideas and techniques here, at least to me.
  • He pretty much reveals his entire program here, which is priceless.
  • I’m not sure this plan will work unless the patient’s treating physician is on-board.
  • His personal testimony and breadth of knowledge are very persuasive. 

Steve Parker, M.D.  

Disclosure:  I was given nothing of value by Dr. Bernstein or his publisher in return for this review.

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Filed under Book Reviews, Carbohydrate, Drugs for Diabetes, Protein