Our diets the same for weight loss and blood to pressure control, and A new study in BMJ seems to conclude that, but let’s look at the details before we get too excited. Dr. Brett shares the medical director at dietdoctor.com. Sometimes the headlines in the abstract don’t accurately reflect what the study shows, and this is another one of those cases. Now to the credit this studying the BMJ was a high-quality study, it was a meta-analysis of 121 randomized control trials and included over 22,000 people. So it is always talking about in that we were constantly referring to the quality of the evidence. We don’t just want to talk about evidence as if it’s all the same because it’s not nutritional epidemiological studies are poor quality studies with very limited conclusions that we can draw. But this study is the highest level of evidence according to our evidence-based guidelines because it’s a randomized controlled trial a collection of randomized control trials. What they looked at was looking at the – diet and low-fat diets and Atkins diet and Zone diet and what they call low carb diets and combining them all and saying you know what’s the difference between them and would they defined. Unfortunately, the low-carb as 40% of your calories from carbohydrates this definition that keeps getting put down. That a study from a Harvard epidemiology me illogical society or actually. It shouldn’t call them that that’s it’s the Harvard School of Public Health, but they keep publishing all these epidemiological studies that it seems like that’s their specialty. They define low-carb as 40% of carbohydrates we covered that study, but nowhere it is again this one in BMJ.
Defining low-carb is 40% every calorie from carbohydrates that’s 200 grams of carbs if you’re on a 2,000 calorie diet I mean that’s not even close to low-carb that’s twice as much as our liberal low-carb diet definition but what they found was that the low-carb diets and the low-fat diets. It’s six and twelve months had about a 4-kg weight loss and a 5 mm career reduction and blood pressure, but the headlines read low-carb no different than low-fat no better than low-fat. It isn’t low-carb, and that’s the problem now here’s what’s so interesting about the study there’s more evidence in this study that didn’t report. They do have some specific information like for the South Beach Diet when you look at the South Beach Diet doesn’t combine it with all those. So-called low-carb studies, it had the most significant weight loss of almost ten kilograms compared to 3.6 kilograms for the – and 2.8 for the Mediterranean. When you look at blood pressure, the Paleo diet, when viewed as a standalone, had a 14 mm mercury reduction in systolic blood pressure compared to 4.6. now they also use the grade criteria GRA de criteria – to assess a level of strength of the evidence. And for the Paleo was moderate to high strength evidence showing that it had a much more significant blood pressure reduction than the low-fat diets. Then Atkins had the highest increase in HDL 3.4 milligrams per deciliter compared to a decrease of 1.9. so these are some of the details in the studies that don’t come out in the headlines that don’t come out in the abstract, but instead, we’re left with low-carb no better no different than low-fat choose whichever diet you want, and that’s not the case.
So we’re going to continue to stick to our definitions, and we implore the scientific community to do the same to define things better. More accurately, because otherwise, it’s just too confusing, these headlines are too complicated and how are you going to know what to make of it without detecting the study and reading. The research well; that’s what we hope these articles will help you. And we applaud the work of the low carb Action Network and the nutrition coalition trying to get the dietary guidelines to redefine what it means to be low carb because 40% let’s face it that’s not it alright. I hope this was helpful to help you understand this study and help you know where we need to go as a scientific community to make our message clearer.