Does eating to control blood sugar help you lose weight?

A new study shows personalizing your Nutrition based on your blood sugar Response does nothing to help weight Loss Or does it that's the kind of common Interpretation of a new study but it Turns out it really doesn't measure Blood sugar so how could this conclusion Be that measuring blood sugar doesn't Help with weight loss if the study Doesn't actually measure blood sugar I'm Dr Bradshaw the medical director of Dietdoctor.com and this is interesting Because I saw a couple posts on social Media showing look at this study it Shows that measuring blood sugar doesn't Help you lose weight and I'm not here to Say it definitely does it does a lot of Good things that I'm going to get to at The end but the important thing is what Does this study actually show so the Study is called effect of a personalized Diet to reduce postprandial glycemic Response versus a low-fat diet on weight Loss in adults with abnormal glucose Metabolism and obesity a randomized Controlled trial and it was published in Jama Network open and so what they did Was they took people with pre-diabetes Or type 2 diabetes on Metformin only Okay so sort of like mild diabetes I Guess you could say and they randomize Them to either a standard low-fat diet Or this this personalized response to

Glucose all right so a personalized diet Recommendation that's supposed to Control their glucose and then they Followed them over the course of six Months now the other important things About this is that they both were Calorie restricted they both were you Know trying to lose seven percent of Their body weight and they were both Both groups were restricting their Calories by about 500 calories per day Both groups had exercise recommendation Both groups had behavioral cognitive Therapy and regular meetings so it was a Pretty you know it was an intensive Intervention in both groups but the diet Was different now in the end there was No statistical difference if you look at The charts and you look at the Um the graphs it looks like there was Quite a big difference but based on the Cohort size and the power there was no Statistical difference but here's the Other thing that there was no difference In there was no difference in their Macronutrients right if you look again There was look like there's some Difference but statistically there was No difference in carbohydrates fats Proteins fiber between the two groups so That's also very interesting but here's The most important Point how did they Determine this personalized dietary Recommendation to control glucose well

It was based off of this protocol Designed by David zivi and colleagues in A paper titled personalized Nutrition By Prediction of glycemic responses Published in cell in 2015 and basically It's an algorithm that uses Anthropometrics the A1C a questionnaire You fill out and your microbiome so What's missing there Your blood sugar responds to food so This is supposed to predict your blood Sugar response to food but there's no Actual measurement of your blood sugar Response to food so if we go back to That to 2015 study that's where they did Wear a CGM and they use this algorithm And they showed that the algorithm was Pretty good at determining blood sugar Response to food but it was short-term And pretty good is not a hundred percent For by any stretch of the imagination so It assumes one there's going to be no Change over time and it assumes that It's just going to work for everybody All the time with Precision well why Don't you just measure their blood sugar That's what I find so interesting and That's what I think this this study Really shows this study shows it was Basically a an attempt to revalidate This protocol this algorithm Um by zv and and colleagues and it Showed that this algorithm itself in This small cohort over six months

Doesn't lead to excess weight loss That's not saying that measuring blood Sugar doesn't help with weight loss Those are two totally different things I I'm a little baffled by the study I Think you just need more studies showing People wearing cgms for a longer period Of time changing their diets based on Certain criteria um of how they respond To foods and then deciding if that helps Them lose weight or not versus a Standard low-fat diet or some other Control diet and that's the data we get We're getting tons of data from Companies like levels or nutrasense or Or other companies using cgms and there Are some studies that have looked at This pilot studies we need bigger Studies longer studies to look at it but Look Our cgms helpful is using blood sugar To guide your dietary choices helpful I Mean absolutely clinically in my opinion It absolutely is one it's an Accountability partner just the the Behavioral feedback mechanism of wearing It too you learn a ton about how Different foods affect your blood sugar And we know based on studies like the zv Study like the a study out of Stanford That there there's a tremendous Individual variability in responses to To this exact same meals so how do you Know how you respond you test it you

Test it with a CGM is likely the best Way to do it does that mean cgms are the Best tool to help you lose weight well No that doesn't prove that but for some People they're absolutely beneficial and The other thing is what criteria do you Use do you want just the flat line in Which case you just eat fat and nothing Else or Um do you accept you know a rise up to 120 or 130 as long as it comes back down Within an hour you know you have to set The criteria area so what I usually Recommend for healthy people without Glucose metabolism issues is you want You don't want your your Peaks to go Above 120 if you can and you want them To come down within an hour but that's Very general guidance what I really like To do is give individual guidance if I Can but of course that's much harder to Do and then someone who has Type 2 Diabetes maybe you you know let that go Up to 140 and coming down within an hour There are different different criteria To use and that's what needs to be Tested what's the ideal criteria to to Show that you're having the best Metabolic response and there are critics Right there are definitely critics who Say look CGM has not been validated in Healthy people for weight loss or even People in type 2 diabetes for weight Loss it's just for blood sugar control

Shouldn't be used for weight loss and They certainly have a point I think the Enthusiasm for it is far greater than The data but that doesn't mean it still Can't be helpful it means we can't say Cgms are the tool the evidence-based Tool to help be with weight loss that we Clearly cannot say but we can say cgms Have a lot of benefit in people Clinically people see this in their Practice people see it individually so If you're patient or you individually Happen to be one of those people who get Value from CGM then by all means you Should use it but it doesn't mean it's An evident evidence-based tool that Should be used in all people and that's Going to be the limitation for you know Insurance coverage to make it widely Acceptable to everybody to use as a Weight loss tool that's going to need The evidence but one if you can afford It And two if you find you're getting Benefit from it then it's probably worth Trying but a study like this doesn't Show that there's no benefit to Tailoring your food based on your Glucose variability for that you got to Measure your glucose variability all Right and we have a whole guide on cgms We'll link to it below hopefully that Will be helpful and we have a podcast With Dr Casey means the co-founder of

Levels Health who is using cgms and We'll link to that here as well all Right thanks a lot everybody have a Great day and we'll see you next time on Diet doctor news on YouTube

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