There Really Is No ‘One Size Fits All’ Diet Plan, According To Study


Have you ever followed your doctors weight loss nutrition plan to a T, only to stubbornly remain at the exact same weight — or worse, gain weight?

Theres a reason for that, according to an ambitious research project by scientists in Israel. Researchers Eran Elinav and Eran Segal of the Weizmann Institute of Science have just published the results of a large, comprehensive study in the periodical Cell that detected people can metabolize the exact same foods in very different ways.

What this entails is that a healthy diet for person or persons may not be healthy for another person. Yet physicians all over the world tend to prescribe the same kinds of foods to people struggling with weight or health issues. Rather than recommend a cookie-cutter solution to weight problems, the researchers tell, physicians could be more effective by recommending a personalized nutrition plan to a patient, based on the way that patient metabolizes certain foods.

“After seeing this data, I think about the possibility that maybe we’re genuinely conceptually incorrect in our thinking about the obesity and diabetes epidemic, Segal said in a statement. “The intuition of people is that we know how to treat these conditions, and it’s just that people are not listening and are feeing out of control — but maybe people are actually compliant but in many cases we were devoting them incorrect advice.”

Some fellow physicians, however, are a bit more skeptical about the pair’s conclusions.

The Study

To measure how food was digested, Elinav and Segal recruited 800 people and studied them intently over the course of one week. Participants were asked to log every bite, sip, exercising conference, bowel movement and sleep conference on a phone app. Their blood sugar levels were measured every five minutes by a device attached to their bodies, and they turned in stool samples for gut bacteria analysis. They also devoted blood samples and ate a few of the same exact dinners for breakfast, so that the scientists could gauge all of the different consequences the same food would have on different people.

Using all that data, Elinav and Segal mapped out which foods affected participants blood sugar the most. They used blood sugar as a health danger indicator because the higher blood sugar spikes and the longer it bides elevated, the more likely a person is to develop Type 2 diabetes, obesity and other facets of metabolic syndrome like high blood pressure, fatty liver disease and cardiovascular disease.

What they found was that the participants all reacted very differently to foods, even after dinners in which participants were feeing the same exact provided foods. In the video above, the researchers explain that sushi actually caused one mans blood sugar to spike higher than ice cream did. For another participant who had struggled to lose weight on different diets all her life, the researchers found that feeing a seemingly healthy food — tomatoes — spiked her blood sugar.

“Examples are numerous — some participants( in fact most participants) feature a lower glycemic response to bread with butter as is comparable to bread, despite its higher caloric content, Elinav told The Huffington Post. “Some individuals glucose levels spike to fresh fruit while not spiking on[ a] moderate quantity of alcohol( a glass of beer ); in some individuals pizza produces a large spike, in others it did not.”

The researchers then selected 26 of the participants to see if they could provide personalized nutrition recommendations would bring down the subjects’ blood sugar levels. And indeed, Elinav and Segal were able to lower blood sugar levels after recommending dinners made of foods they knew wouldnt spike individual participants blood sugar.

Interestingly, these dietary changes also resulted in a change in gut bacteria in the participants. That may be important because gut bacteria — the billions of microorganisms living in our body — help us by breaking down our food for us in our stomach and intestines. Past studies have suggested that while weve all got unique communities of bacteria living inside us, depending on our environments and what we inherit, some kinds of bacteria are more helpful than others when it comes to blood sugar, obesity and diabetes. And we can perhaps influence which gut bacteria live in our intestines by feeing certain specific types of foods.

Future Plans

Segal and Elinavs research was funded by general academic grants and they received no commercial funding. But the pair said theyve already licensed their research means to an outside company to continue building on their findings. They want to develop a service that creates personalized nutrition plans for people with pre-diabetes, diabetes, obesity and other health complications that are linked to nutrition.

For example, because they were able to test their methods on each other, Segal and Elinav have made some personal changes to their own diets now that they know what foods spiked their blood sugar levels. Elinav found that for him, it was best to reduce both bread and beef, while beer seemed to have no effect on his blood sugar. Segal, on the other hand, has to avoid sushi and bread. Happily, he has procured desserts that he can eat without remorse.

“I also found out that dark chocolate and ice cream do very little to my sugar levels, and I now eat these on a regular basis, told Segal. Lucky guy.

Unfortunately, until the service launchings, Segal and Elinav dont have much advice to give those who want to customize their diet now, except to confirm that there really is no one sizing fits all diet that would work well for everyone.

Is it a breakthrough?

Dr. James DiNicolantonio, a cardiovascular research scientist at Saint Lukes Mid America Heart Institute and associate editor of BMJs Open Heart journal, was not involved in the study and is skeptical of Segal and Elinavs outcomes. He says theres little practical takeaway for patients or health care providers, and questioned their decision to measure blood sugar levels after a snack, as measuring insulin levels after a snack is a more established route of determining whether people are developing insulin resistance that can lead to form 2 diabetes.

Segal and Elinav agree with DiNicolantonio that insulin level measurings would have been helpful, too, but pointed out that only blood sugar levels can be continually measured the route they wanted for the research. They recorded over 2,000 blood sugar levels per participant with the attached device, while pricking a person for a fell of blood 2,000 days to get insulin levels would have been impossible — or at least highly unpleasant, especially while the participants were sleeping.

Dr. Suneil Koliwad, an assistant professor at the University of California, San Francisco Diabetes Center and the Gerold Grodsky Chair in diabetes research, also had concerns about Segal and Elinavs findings. He was wary of the studys reliance on self-reported diet, a technique of data collection that’s notoriously inaccurate, especially with people who are obese or have diabetes. He also pointed out a lack of research about what a blood sugar spike may actually entail if, tell, it was truly triggered by a healthy food such as a tomato.

But despite the fact Koliwad thought it was premature to be developing a consumer product based on this study, he was much more optimistic about its potential to spur future research that could one day lead to dependable consumer products and services that generate personalized health plans in general.

Potentially market ready tools that can be a great service to people who want to prevent obesity, diabetes and cancer, are on the horizon, and its going to be studies just like the one youre asking me about that they are able to lead us to that point, Koliwad told HuffPost. And thats not too far off — Im talking years , not decades, and thats very heartening to all of us who work in the field of metabolism.”

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