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Home»Nutrition»Can science help personalize your diet?
Nutrition

Can science help personalize your diet?

DLgSDd9By DLgSDd9February 2, 2023No Comments8 Mins Read
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If some of us have friends who eat sweets every day and aren’t gaining weight, or relatives who developed heart disease despite avoiding saturated fats, the one-size-fits-all diet recommendation is for us. But now one of the most comprehensive and ambitious new studies on diet could change that, and experts are finally gives you insights that allow you to tailor your recommendations to different people.

Starting this spring, 13 sites across the United States will begin enrolling 10,000 people across ages and weights to better determine the key factors involved in what is called precision nutrition. Specific efforts will be made to include people who are often overlooked in nutritional science: those aged 65 and over, people of color, rural residents, people with disabilities, and sexual minorities.

During the first phase of the study, which lasts two weeks, everyone is instructed to eat normally. In the second phase, 1,500 people will be assigned one of several meals and the meals will be sent directly to their homes. And in the final phase, 500 people, selected from a larger group, will feed at the research center where he will stay for two weeks. The latter are the multitude of controlled nutrition studies that typically involve dozens of participants, says Holly Nicastro.Participants will be selected from NIH all of us A health research program that anyone can participate in.

This large and diverse effort “will give us a step towards being able to provide more detailed nutritional recommendations to groups of individuals,” said one of the six research centers that coordinate the registry site. Sai Krupa Das, metabolic scientist at Tufts University,

How the survey works

During the study, researchers will regularly perform urine and blood tests to complete a survey of each person’s gut microbiome (the trillions of microbes that permanently reside in the digestive tract). Participants wear blood glucose monitors to record rises and falls in blood glucose levels. It is a marker of how well your body is processing carbohydrates and is an important indicator of your health. Daily activities such as sleep, stress and mealtimes are also tracked.

Please respect the copyright. Unauthorized use is prohibited.

Color scanning electron micrograph of bacteria in yogurt milk solids.

Please respect the copyright. Unauthorized use is prohibited.

left: Live Cultured Yogurt and Probiotic Supplements contain beneficial bacteria intended to live in your gut.

Photo courtesy of SCIENCE PHOTO LIBRARY

right: Color Scanning Electron Micrograph of Two Types of Bacteria Commonly Found in Yogurt Solids: Rods Lactobacillus bulgaricus (brown), and Streptococcus thermophilus, Form a chain of spheres.

Micrograph by POWER AND SYRED/SCIENCE PHOTO LIBRARY

The new study will change our understanding of the human diet because it’s fundamentally different from how most nutrition research is conducted, said a member of the U.S. Military Academy at West Point, who was involved in the study. Diana Thomas, a professor of mathematics, says nutritional scientists typically look at single foods in homogeneous populations to see, for example, whether blueberries reduce the risk of cardiovascular disease in Americans. (The answer is yet to be unclear). In this study, instead of starting with a hypothesis, she “asked what factors were involved,” she says.

The goal is to uncover the many variables that influence nutritional responses and develop algorithms to predict them so that nutritionists can provide dietary advice to others with similar characteristics.

Providing more targeted recommendations is key to improving public health, Das said.Current approaches have led many people to ignore expert dietary advice, whether because the advice seems to change frequently (classic: eggs are badeggs are good), or the recommended way to eat, and found it wasn’t ideal for me. “Precision Nutrition will give you better results than the one-size-fits-all Mediterranean diet advice. “That’s the step we’re approaching,” she says.

Das warns that new advice derived from research does not reach the level of the individual. That is why experts prefer the term precision nutrition to another widely used term, personalized nutrition.

The research focuses on eating for optimal health, not for weight loss, but the two are closely related, Das says. Although we don’t offer it, we believe that our response in terms of trying to optimize our metabolism will also help with weight management.”

Gene vs Microbiome

Decades of research have already provided clues as to which factors shape overall health.

One of them is heredity. The field was formerly called nutrigenomics, but it fell out of favor when it became clear that genes played less of a role in how the body responded to food than first thought. Yes, says Jose Ordovas, director of nutrition and genomics at Tufts University.

In a small number of cases, scientists have linked specific genes to direct health effects. Genetic mutations determine whether a nighttime cup of joe will make a person sleep through the night or enable a restful night’s sleep. also affect ride a bike faster.

“Genetics is involved, but there are so many other factors involved that we don’t have a predictive formula to individualize our recommendations,” Ordovás said. Many of these factors, especially behavior, are more easily modifiable than genes, so understanding them should lead to more effective approaches to improving health.

Hundreds of studies have shown that the microbiome (the bacteria, fungi, parasites and viruses that live in your gut) is a key factor in how your body processes food. For example, ingesting artificial sweeteners Change Composition and function of the microbiome to increase glucose intolerance in healthy individuals.and certain gut microbes continue Obese mice after dieting tend to regain their weight.

There is still much to learn about the microbiome, including its optimal composition, how microbes work synergistically, and how lifestyle affects this community.

Influence of lifestyle on how food is processed

One of the most difficult aspects of finding the optimal diet for each individual is the complex interplay between genome, microbiome and lifestyle factors. The latter are what scientists call exposomes.

One of those lifestyle factors is when it’s time to eat dinner, says Elinav. His lab found that the gut microbiome follows a circadian rhythm and predicts microbiota composition. change Their number and 24-hour function. They do this by responding to signals from sleeping and eating behaviors.

“When shift work or jet lag disrupts sleep-wake patterns, one of the first things that happens is disruption of microbial diurnal activity,” says Elinav.Increased incidence of obesity, type 2 diabetes and cancer associated with people with chronically disrupted sleep and eating schedules stem Studies in mice suggest this change in the microbiome.

According to Das of Tufts, lack of sleep and intense stress further disrupt metabolism, which can negatively affect health even in those who eat a healthy diet.

NIH’s precision nutrition research will be the most comprehensive effort to use genes, microbiota, and exposomes to understand and predict nutritional responses to food, but it will not be the first. Several previous studies have paved the way.

Led by Elinahu’s lab, It was published in the magazine cell 2015fed 800 people the same diet and continuously monitored their blood sugar levels. We noted that biome composition played an important role in determining its response, but other factors were inevitably involved.

A few years later, a large-scale study was carried out in the UK to try to expand our knowledge of the variables at work. The study, called the Personalized Responses to Dietary Composition Trial, or PREDICT, involvement We monitored gut microbiota, blood fat, postprandial glucose levels, inflammation, and other factors in 1,000 adults, including genetically identical twins, for two weeks. Ordovás says tracking blood sugar levels throughout the day is also a key factor. Such continuous monitoring allowed researchers to measure the effects of specific foods.

This place is also wide variation It seemed to indicate that the participants’ bodies were processing the same nutrients differently.Genetic factors were proven to have a modest effect, but findings showed just how complex the digestive system is. Prevotella copri When Blast cystis—was more important than genes for processing some foods, but both account for only a fraction of the overall difference.

The goal of future NIH research is to improve our understanding of the factors that explain these differences.It is hoped that this will allow people to adjust their lifestyle and diet, and possibly their gut microbiome, to improve the body’s response to different nutrients. It is still unclear whether the manipulation of unclear.)

For now, Das says the best nutrition advice she and others offer is sticking to the basics.Fill your plate with fiber-rich vegetables and fruits and avoid highly processed foods. Avoid and prefer natural foods.

“In the next five to 10 years, we’re going to see a big change in how we look at food,” predicts West Point’s Thomas. “We will know more as the NIH research results begin to emerge.”

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