Tag Archives: Weight Loss

Exposure to Cold May Help You With Weight Management

Well below room temp here

Should be well below room temp here

David Mendosa found a 2016 research report suggesting that cool temperatures may help with weight management by activating our brown fat, which burns more calories. Heat generated by brown fat is derived from glucose and triglycerides. Keep in mind as you read further that a comfortable environment temperature for a clothed human is about 23°C or 73°F. Those temps don’t stress our bodies by requiring us to either generate or dissipate extra body heat.

David writes:

Researchers have discovered that when we get mildly cold, which they define as being cool without shivering, our bodies burn more calories. As a result, managing our weight can be easier.
This is the conclusion of a recent review that two researchers at Maastricht University Medical Center in the Netherlands published in the November 2016 issue of the professional journal Diabetologia. The title of their article, “Combatting type 2 diabetes by turning up the heat,” puzzled me at first.

The title confused me because the study is about turning down the heat in the room we’re in. But then our bodies compensate by turning up their internal heat production.

When our body does this, its energy expenditure increases, ratcheting up our metabolism. Being mildly cold revs up our bodies’ brown fat, which unlike white fat, burns calories instead of storing them.

It’s not quite clear how much cold exposure it takes to turn on your brown fat. From the link above:

Cold acclimation by intermittent exposure to a cool (14–17°C) [57–63°F], or cold (10°C) [50°F] environment resulted in significant increases in NST [non-shivering thermogenesis or heat production] capacity. A 10 day cold acclimation study with 6 hour exposure to 14–15°C [57–59°F] per day was enough to significantly increase NST by 65% on average. A 6 week mild cold acclimation study (daily 2 hour cold exposure at 17°C [63°F]) also resulted in an increase in NST together with a concomitant decrease in body fat mass. The latter two studies also revealed significant increases in BAT [brown adipose tissue] presence and activation. All in all, cold-induced BAT activity is significant in adults and parallels NST. The actual quantitative contributions of BAT and of other tissues (e.g. skeletal muscle) to whole-body NST are, however, not elucidated and await further studies. Furthermore, more information is needed on the duration, timing and temperatures to find out which treatments are most effective with respect to increasing NST.

Furthermore, cold exposure over the course of 10 days increased insulin sensitivity in T2 diabetics by 43%. Eight study subjects, probably in the Netherlands, were exposed to temps of 14–15°C [57–59°F] but I don’t know for how many hours a day. Increased insulin sensitivity should help keep a lid on blood sugar levels and reduce the need for diabetes drugs.

In case you’re elderly, obese, or have type 2 diabetes, be aware that the activation of brown fat by cold exposure is not as robust as in others.

On the other hand, I found evidence that higher ambient temperatures (above 23°C) [73°F] may also help with weight management, regardless of what brown fat is doing. Science is hard.

Steve Parker, M.D.

PS: Check out my books for more ideas on weight management.

 

Comments Off on Exposure to Cold May Help You With Weight Management

Filed under Weight Loss

Low-Carb Beats Low-Fat Diet for Weight Loss Once Again

…according to an article at MedPageToday.

Many physicians have been reluctant to recommend low-carb diets out of fear that they increase cardiovascular risk. A recent study compared low-carb to low-fat dieting over 12 months and actually found better improvements in cardiovascular disease risk factors on the low-carb diet (max of 40 grams a day).

This Avocado Chicken soup is low-carb. Use the search box to find the recipe.

This Avocado Chicken soup is low-carb. Use the search box to find the recipe.

After 12 months, folks on a low-carbohydrate diet had lost 5.3 kg (11.7 lb), while those on a low-fat diet with similar caloric value had lost 1.8 kg (3.9 lb). Both groups showed lowering of LDL cholesterol, while the low-carbers had better improvements in HDL cholesterol and triglycerides.

DietDoctor Andreas Eenfeldt can add this study to his list of others that show better weight loss with low-carb diets compared to low-fat.

Regular readers here know of my Low-Carb Mediterranean Diet for diabetes and prediabetes. My Advanced Mediterranean Diet for non-diabetics also offers a low-carb option in addition to traditional reduced-calorie portion-control eating.

Steve Parker, M.D.

Comments Off on Low-Carb Beats Low-Fat Diet for Weight Loss Once Again

Filed under Carbohydrate, Mediterranean Diet, Weight Loss

New Study Suggests Low-Carb Diet Healthier Than Low-Fat in T2 Diabetes

This is an important report because most diet studies last much less than one year. Details are in the American Journal of Clinical Nutrition.

Study participants were 115 obese (BMI 35) type 2 diabetics with hemoglobin A1c averaging 7.3%. Average age was 58. So pretty typical patients, although perhaps better controlled than average.

They were randomized to follow for 52 weeks either a very low-carbohydrate or a high-carbohydrate “low-fat” diet. Both diets were designed to by hypocaloric, meaning that they provided fewer calories than the patients were eating at baseline, presumably with a goal of weight loss. The article abstract implies the diets overall each provided the same number of calories. They probably adjusted the calories for each patient individually. (I haven’t seen the full text of the article.) Participants were also enrolled in a serious exercise program: 60 minutes of aerobic and resistance training thrice weekly.

Kayaking is an aerobic exercise if done seriously

Kayaking is an aerobic exercise if done seriously

The very low-carb diet (LC diet) provided 14% of total calories as carbohydrate (under 50 grams/day). The high-carb diet (HC diet) provided 53% of total calories as carbohydrate and 30% of calories as fat. The typical Western diet has about 35% of calories from fat.

Both groups lost weight, about 10 kg (22 lb) on average. Hemoglobin A1c, a reflection of glucose control over the previous three months, dropped about 1% (absolute reduction) in both groups.

Compared to the HC diet group, the LC dieters were able to reduce more diabetes medications, lower their triglycerides more, and increase their HDL cholesterol (“good cholesterol”). These triglyceride and HDL changes would tend to protect against heart disease.

SO WHAT?

You can lose weight and improve blood sugar control with reduced-calorie diets—whether very low-carb or high-carb—combined with an exercise program. No surprise there.

I’m surprised that the low-carb group didn’t lose more weight. I suspect after two months of dieting, the low-carbers started drifting back to their usual diet which likely was similar to the high-carb diet. Numerous studies show superior weight loss with low-carb eating, but those studies are usually 12 weeks or less in duration.

The low-carb diet improved improved lipid levels that might reduce risk of future heart disease, and allowed reduction of diabetes drug use. Given that we don’t know the long-term side effects of many of our drugs, that’s good.

If I have a chance to review the full text of the paper, I’ll report back here.

Steve Parker, M.D.

Reference: Jeannie Tay, et al. Comparison of low- and high-carbohydrate diets for type 2 diabetes management: a randomized trial. First published July 29, 2015, doi: 10.3945/​ajcn.115.112581    Am J Clin Nutr

3 Comments

Filed under Carbohydrate, Heart Disease, Weight Loss

Prevent Weight Regain With the Mediterranean Diet

Italian seaside tangentially related to this post

Italian seaside tangentially related to this post

Investigators affiliated with universities in Italy and Greece wondered about the effect on obesity of two ketogenic “Mediterranean” diet spells interspersed with a traditional Mediterranean diet over the course of one year. They found significant weight loss, and perhaps more importantly, no regain of lost weight over the year, on average.

This scientific study is right up my alley. I was excited when I found it. Less excited after I read it.

The Set-Up

This was a retrospective review of medical records of patients of a private nutritional service in three fitness and weight control centers in Italy between 2006 and 2010. It’s unclear whether patients were paying for fitness/weight loss services. 327 patient records were examined. Of these, 89 obese participants met the inclusion and exclusion criteria and started the program; 68 completed it and were the ones analyzed. (That’s not at all a bad drop-out rate for a year-long study.)  The completers were 59 males and 12 females (I know, the numbers don’t add up, but that’s what they reported). Ages were between 25 and 65. Average weight was 101 kg (222 lb), average BMI 35.8, average age 49. All were Caucasian. No diabetics.

Here’s the program:

  1. 20 days of a very-low-carb ketogenic diet, then
  2. 20 days of a low-carbohydrate non-ketogenic diet for stabilization, then
  3. 4 months of a normal caloric Mediterranean diet, then
  4. repeat #1 and #2, then
  5. 6 months of a normal caloric Mediterranean diet

In the ketogenic phases, which the authors referred to as KEMEPHY, participants followed a commercially available protocol called TISANOREICA. KEMEPHY is combination of four herbal extracts that is ill-defined (at least in this article), with the idea of ameliorating weakness and tiredness during ketosis. The investigators called this a ketogenic Mediterranean diet, although I saw little “Mediterranean” about it. They ate “beef & veal, poultry, fish, raw and cooked green vegetables without restriction, cold cuts (dried beef, carpaccio and cured ham), eggs and seasoned cheese (e.g., parmesan).” Coffee and tea were allowed. Items to avoid included alcohol, bread, pasta, rice, milk, and yogurt. “In addition to facilitate the adhesion to the nutritional regime, each subject was given a variety of specialty meals constituted principally of protein and fibers. “These meals (TISANOREICA) that are composed of a protein blend obtained from soya, peas, oats (equivalent to 18 g/portion) and virtually zero carbohydrate (but that mimic their taste) were included in the standard ration.” They took a multivitamin every morning. Prescribed carbohydrate was about 30 grams a day, with macronutrient distribution of 12% carb, 36 or 41% protein, and 51 0r 52% fat. It appears that prescribed daily calories averaged 976 (but how can that be prescribed when some food items are “unrestricted”?).

I found little explanation of period #2 mentioned above, the low-carb non-ketogenic diet. Prescribed macronutrients were 25 or 33% carb, 27 0r 31% protein, 41 or 44% fat, and about 91 g carbohydrate. Prescribed daily calories appear to have averaged 1111.

After the first and second active weight loss ketogenic phases, participants ate what sounds like a traditional Mediterranean diet. Average prescribed macronutrient distribution was 57% carbohydrate, 15 % protein, and 27% fat. Wine was allowed. It looks like 1800 calories a day were recommended.

Food consumption was measured via analysis of 3-day diaries, but you have to guess how often that was done because the authors don’t say. The results of the diary analyses are not reported.

What Did They Find?

Most of the weight loss occurred during the two ketogenic phases. Average weight loss in the first ketogenic period was 7.4 kg (16 lb), and another 5.2 kg (11 lb) in the second ketogenic period. Overall average weight loss for the entire year was 16.1 kg (35 lb).

Average systolic blood pressure over the year dropped a statistically significant 8 units over the year, from 125 to 116 mmHg.

Over the 12 months, they found stable and statistically significant drops in total cholesterol, LDL cholesterol (“bad cholesterol”), triglycerides, and blood sugar levels. No change in HDL cholesterol (“good cholesterol”).

Liver and kidney function tests didn’t change.

The authors didn’t give explanations for the drop-outs.

Although the group on average didn’t regain lost weight, eight participants regained most of it. The investigators write that “…the post dietary analysis showed that they were not compliant with nutritional guidelines given for the Mediterranean diet period. These subjects returned to their previous nutrition habits (“junk” food, high glycaemic index, etc.) with a mean “real” daily intake of 2470 Kcal rather than the prescribed 1800 Kcal.”

Comments

A key take-home point for me is that the traditional Mediterranean diet prevented the weight regain that we see with many, if not most, successful diets.

However, most formulas for calculating steady state caloric requirements would suggest these guys would burn more than the 1800 daily calories recommended to them during the “normal calorie” months. How hard did the dieters work to keep calories around 1800? We can only speculate.

Although the researchers describe the long periods of traditional Mediterranean diet as “normal caloric,” they don’t say how that calorie level was determined  and achieved in the real world. Trust me, you can get fat eating the Mediterranean diet if you eat too much.

I’ll be the first to admit a variety of weight loss diets work, at least short-term. The problem is that people go back to their old ways of eating regain much of the lost weight, typically starting six months after starting the program. It was smart for the investigators to place that second ketogenic phase just before the typical regain would have started!

There are so few women in this study that it would be impossible to generalize results to women. Why so few? Furthermore, weight loss and other results weren’t broken down for each sex.

I suspect the results of this study will be used for marketing KEMEPHY and TISANOREICA. For all I know, that’s why the study was done. We’re trusting the investigators to have done a fair job choosing which patient charts to analyze retrospectively. They could have cherry-picked only the good ones. Some of the funding was from universities, some was from Gianluca Mech SpA (what’s that?).

How much of the success of this protocol is due to the herbal extracts and TISANOREICA? I have no idea.

The authors made no mention of the fact the average fasting glucose at baseline was 103 mg/dl (5.7 mmol/l). That’s elevated into the prediabetic range. So probably half of these folks had prediabetes. After the one-year program, average fasting glucose was normal at 95 mg/dl (5.3 mmol/l).

The improved lipids, blood sugars, and lower blood pressure may have simply reflected successful weight loss and therefore could have been achieved  by a variety of diets.

The authors attribute their success to the weight-losing metabolic effects of the ketogenic diet (particularly the relatively high protein content), combined with the traditional Mediterranean diet preventing weight regain.

The authors write:

The Mediterranean diet is associated with a longer life span, lower rates of coronary heart disease, hypercholesterolemia, hypertension, diabetes and obesity. But it is difficult to isolate the “healthy” constituents of the Mediterranean diet, since it is not a single entity and varies between regions and countries. All things considered there is no “one size fits all” dietary recommendation and for this reason we have tried to merge the benefits of these two approaches: the long term “all-life” Mediterranean diet coupled with brief periods of a metabolism enhancing ketogenic diet.

I’ve attempted a similar merger with my Low-Carb Mediterranean Diet. Click here for an outline. Another stab at it was the Spanish Ketogenic Mediterranean Diet. And here’s my version of a Ketogenic Mediterranean Diet.

Steve Parker, M.D.

Reference: Paoli, Antonio, et al. Long Term Successful Weight Loss with a Combination Biphasic Ketogenic Mediterranean Diet and Mediterranean Diet Maintenance Protocol. Nutrients, 5 (2013): 5205-5217. doi: 10.3390/nu5125205

3 Comments

Filed under ketogenic diet, Mediterranean Diet, Prediabetes, Weight Loss, Weight Regain

QOTD: Exercise and Weight Loss

Let me be clear. Exercise is not important because it burns calories! Exercise without calorie restriction is a remarkably ineffective weight loss intervention, because it usually makes us hungry enough to replace the calories we burn. Exercise is important because it restores your ability to oxidize fat—both when fasting and after meals. And we can tie this in with mitochondrial dysfunction by noting that exercise is proven to increase mitochondrial volume.

J. Stanton

Comments Off on QOTD: Exercise and Weight Loss

Filed under Exercise, Quote of the Day

Diabetes Drug Now Sold As Weight-Loss Aid

It’s liraglutide, which has been available to treat diabetes in the U.S. since 2009. It’s sold as Victoza. Click for my brief review of the drug class for diabetics. The weight-loss preparation will be sold in the U.S. as Saxenda and it’s a higher dose than is used for just diabetes.

Click for the CBS News report on Saxenda. A snippet:

One clinical trial that involved patients without diabetes found that patients taking Saxenda had an average weight loss of 4.5 percent after one year. Of the people treated with the drug, 62 percent lost at least 5 percent of their body weight. Meanwhile, only 34 percent of those given an inactive placebo had the same result.

Another clinical trial that included patients with type 2 diabetes found that patients had an average weight loss of almost 4 percent after one year. Of those given Saxenda, 49 percent lost at least 5 percent of their body weight, compared to 16 percent of those who were given a placebo treatment.

Click for the FDA’s press release.

Oh, by the way. You have to inject it daily under the skin (subcutaneous). And if you were hoping for a shortcut to weight loss, this ain’t it. You’re still supposed to follow a reduced-calorie diet and exercise regularly.

I’d try the  Low-Carb Mediterranean Diet first if I had diabetes.

Steve Parker, M.D.

PS: Full prescribing information.

2 Comments

Filed under Weight Loss

Salads, Vinaigrettes, and Cruets

Our new cruet

Our new $8 cruet

If you’re trying to lose weight or keep from getting fat, salads are helpful. I recommend them in my Advanced Mediterranean Diet, Low-Carb Mediterranean Diet, Paleobetic Diet, and Ketogenic Mediterranean Diet.

My favorite salad dressings are vinaigrettes. They can be as simple as olive oil, vinegar, salt and pepper. The problem with most commercial vinaigrettes is the label says “_____ Vinaigrette with olive oil, “but the first listed ingredient is soybean oil (or some other industrial seed oil) and olive oil is somewhere down the line.

Get around that by making your own. Here’s a recipe and a salad to try it on. Also, if you’re watching your carb consumption, the commercial dressings  may sneak in more than you want. Again, avoid that by making your own.

Cruet label

Cruet label

You can make a vinaigrette in a jar with a lid. Add the ingredients then shake to create an emulsion. Or do it in a bowl with a whisk. My wife found us a cruet at the supermarket that I’m hoping will allow mixing, storing, and pouring all from the same attractive container. I’ll let you know if it doesn’t work out; I’m afraid it will leak when I shake it.

Steve Parker, M.D.

PS: It leaked. This device is for a liquid that you won’t be shaking.

Comments Off on Salads, Vinaigrettes, and Cruets

Filed under Recipes

Does Skipping Breakfast Affect Weight Loss?

It didn’t in this 16-week study. I don’t know what they ate nor how many calories. 

1 Comment

Filed under Uncategorized

Ketogenic Diet Works for Children

ketogenic diet, children

Is there a trampoline out of view?

A ketogenic diet was safe and effective for weight loss in children and adolescents, according to a small study in the Journal of Pediatric Endocrinology and Metabolism.  Fifty-six children were placed on either a ketogenic diet or a calorie-restricted diet.  The investigators judged the low-carb ketogenic diet more effective.

I don’t treat children, so I don’t normally monitor the pediatric scientific literature.  Thanks to Diet Doctor Andreas Eenfeldt for bringlng this to my attention.  I’ve not read the full research report.

In 2010 I reported on research showing a low-carb, high-protein diet was safe and effective for severely obese adolescents.

Steve Parker, M.D.

Comments Off on Ketogenic Diet Works for Children

Filed under ketogenic diet, Weight Loss

Periodic Tests, Treatments, and Goals for PWDs (Persons With Diabetes)

If you don't like your physician, find a new one

If you don’t like your physician, find a new one

So, you’ve got diabetes. You’re trying to deal with it or you wouldn’t be here. You’ve got a heck of a lot of medical information to master.

Unless you have a good diabetes specialist physician on your team, you may not be getting optimal care. Below are some guidelines you may find helpful. The goal is to prevent diabetes complications. Many primary care physicians will not be up-to-date on the guidelines. Don’t hesitate to discuss them with your doctor. Nobody cares as much about your health as you do.

Annual Tests

The American Diabetes Association (ADA) recommends the following items be done yearly (except as noted) in non-pregnant adults with diabetes. (Incidentally, I don’t necessarily agree with all ADA guidelines.) The complete ADA guidelines are available on the Internet.

  • Lipid profile (every two years if results are fine and stable)
  • Comprehensive foot exam
  • Screening test for distal symmetric polyneuropathy: pinprick, vibration, monofilament pressure sense
  • Serum creatinine and estimate of glomerular filtration rate (MDRD equation)
  • Test for albumin in the urine, such as measurement of albumin-to-creatinine ratio in a random spot urine specimen
  • Comprehensive eye exam by an ophthalmologist or optometrist (if exam is normal, every two or three years is acceptable)
  • Hemoglobin A1c at least twice a year, but every three months if therapy has changed or glucose control is not at goal
  • Flu shots

Other Vaccinations, Weight Loss, Diabetic Diet, Prediabetes, Alcohol, Exercise, Etc.

Additionally, the 2013 ADA guidelines recommend:

  • Pneumococcal vaccination. “A one time re-vaccination is recommended for individuals >64 years of age previously immunized when they were <65 years of age if the vaccine was administered >5 years ago.” Also repeat the vaccination after five years for patients with nephrotic syndrome, chronic kidney disease, other immunocompromised states (poor ability to fight infection), or transplantation.
  • Hepatitis B vaccination to unvaccinated adults who are 19 through 59 years of age.
  • Weight loss for all overweight diabetics. “For weight loss, either low-carbohydrate, low-fat calorie-restricted, or Mediterranean diets may be effective in the short-term (up to two years).” For those on low-carb diets, monitor lipids, kidney function, and protein consumption, and adjust diabetic drugs as needed. The optimal macronutrient composition of weight loss diets has not been established. (Macronutrients are carbohydrates, proteins, and fats.)
  • “The mix of carbohydrate, protein, and fat may be adjusted to meet the metabolic goals and individual preferences of the person with diabetes.” “It must be clearly recognized that regardless of the macronutrient mix, total caloric intake must be appropriate to weight management goal.”
  • “A variety of dietary meal patterns are likely effective in managing diabetes including Mediterranean-style, plant-based (vegan or vegetarian), low-fat and lower-carbohydrate eating patterns.”
  • “Monitoring carbohydrate, whether by carbohydrate counting, choices, or experience-based estimation, remains a key strategy in achieving glycemic control.”
  • Limit alcohol to one (women) or two (men) drinks a day.
  • Limit saturated fat to less than seven percent of calories.
  • During the initial diabetic exam, screen for peripheral arterial disease (poor circulation). Strongly consider calculation of the ankle-brachial index for those over 50 years of age; consider it for younger patients if they have risk factors for poor circulation.
  • Those at risk for diabetes, including prediabetics, should aim for moderate weight loss (about seven percent of body weight) if overweight. Either low-carbohydrate, low-fat calorie-restricted, or Mediterranean diets may be effective in the short-term (up to 2 years). Also important is exercise: at least 150 minutes per week of moderate-intensity aerobic activity. “Individuals at risk for type 2 diabetes should be encouraged to achieve the U.S. Department of Agriculture (USDA) recommendation for dietary fiber (14 g fiber/1,000 kcal) and foods containing whole grains (one-half of grain intake).” Limit intake of sugar-sweetened beverages.
  • “Adults with diabetes should be advised to perform at least 150 min/week of moderate-intensity aerobic physical activity (50–70% of maximum heart rate), spread over at least 3 days/week with no more than two consecutive days without exercise. In the absence of contraindications, adults with type 2 diabetes should be encouraged to perform resistance training at least twice per week.”
  • Screening for coronary artery disease before an exercise program is depends on the physician judgment on a case-by-case basis. Routine screening is not recommended.
Steve Parker MD, low-carb diet, diabetic diet

Olive, olive oil, and vinegar: classic Mediterranean foods

Obviously, some of my dietary recommendations conflict with ADA guidelines. The experts assembled by the ADA to compose guidelines were well-intentioned, intelligent, and hard-working. The guidelines are supported by 528 scientific journal references. I greatly appreciate the expert panel’s work. We’ve simply reached some different conclusions. By the same token, I’m sure the expert panel didn’t have unanimous agreement on all the final recommendations. I invite you to review the dietary guidelines yourself, discuss with your personal physician, then decide where you stand.

General Blood Glucose Treatment Goals

The ADA in 2013 suggests these therapeutic goals for non-pregnant adults:

  • Fasting blood glucoses: 70 to 130 mg/dl (3.9 to 7.2 mmol/l)
  • Peak glucoses one to two hours after start of meals: under 180 mg/dl (10 mmol/l)
  • Hemoglobin A1C: under 7%
  • Blood pressure: under 140/80 mmHg
  • LDL cholesterol: under 100 mg/dl (2.6 mmol/l). (In established cardiovascular disease: <70 mg/dl or 1.8 mmol/l may be a better goal.)
  • HDL cholesterol: over 40 mg/dl (1.0 mmol/l) for men and over 50 mg/dl (1.3 mmol/l) for women
  • Triglycerides: under 150 mg/dl (1.7 mmol/l)

The American Association of Clinical Endocrinologists (AACE) in 2011 proposed somewhat “tighter” blood sugar goals for non-pregnant adults:

  • Fasting blood glucoses: under 110 mg/dl (6.11 mmol/l)
  • Peak glucoses 2 hours after start of meals: under 140 mg/dl (7.78 mmol/l)
  • Hemoglobin A1C: 6.5% or less

The ADA reminds clinicians, and I’m sure the AACE guys agree, that diabetes control goals should be individualized, based on age and life expectancy of the patient, duration of diabetes, other diseases that are present, individual patient preferences, and whether the patient is able to easily recognize and deal with hypoglycemia. I agree completely.

Steve Parker, M.D.

2 Comments

Filed under Diabetes Complications, Exercise, Fat in Diet, Fiber, Mediterranean Diet, Overweight and Obesity, Prediabetes, Prevention of T2 Diabetes