Research in personalized nutrition is just getting started. Novel approaches to diet personalization have emerged as a result of technological advancements that facilitate testing and advances in our knowledge of the variables influencing each person’s unique digestive and metabolic profile.
This article examines the emergence of customized nutrition, highlighting its importance, important research areas, and upcoming obstacles for this novel and fascinating field of study.
Personalized nutrition: what is it?
The idea that there is no one size fits all approach is the foundation of personalized nutrition. Each of us is unique, with variations in our microbiome, genetics, metabolism, and biochemistry. As a result, a customized dietary plan that takes into account our individual eating preferences, body measurements, weight, cholesterol levels, and lifestyle can be developed. Other names for personalized nutrition include “nutritional genomics,” “precision nutrition,” and “individualized nutrition,” and these terminology can have similar implications in the literature.
Why is it necessary for us?
Chronic illness is an issue that we are currently facing. Approximately 60% of adult Americans live with one or more chronic illnesses in the US alone (Bush et al., 2019). Chronic diseases account for seven of the top 10 main causes of death in the United States.
Chronic disease is a result of poor diet. Cancers linked to nutrition and cardiometabolic disorders rank among the world’s top causes of mortality. A healthy diet rich in fruits, vegetables, whole grains, legumes, and nuts is linked to lower rates of chronic diseases across a variety of adult subgroups, according to a mountain of evidence.
The “omics sciences”—nutritional genomics, metabolomics, proteomics, microbiomics, epigenomics, and transcriptomics—all have applications in customized nutrition. In order to better understand an individual’s unique needs, these tests uncover pertinent substances such as metabolites, proteins, microorganisms, and genes in addition to investigations into bodily system function and nutritional and environmental factors.
The microbiome’s pivotal function
The microbiome is essential to the gut’s effective operation. Although it can be challenging to pinpoint the precise characteristics of a “healthy” microbiome due to variations based on an individual’s age, diet, and environment, a healthy gut microbiome can be identified by its stability, diversity, and ability to support metabolic processes. The development of the immune system, epithelial homeostasis, vitamin synthesis, and metabolite synthesis are all processes that the microbiome is crucial to.
For instance, research has demonstrated a substantial correlation between alterations in the enteral microbiome and the pathogenesis of Inflammatory Bowel Disease (IBD). Furthermore, ‘good’ and ‘bad’ bacteria have been linked to an individual’s susceptibility to common ailments including obesity, heart disease, and Type 2 diabetes.
We can change our macrobiotic profile by choosing the right meals based on our unique biological makeup. Professional nutritionists can recommend tailored diets, and specialized home-testing kits are now available. Even though the field of personalized nutrition is very young, interest in it is growing.
What role does genetics play?
Studies on insulin resistance have shown that our unique genetic makeup may affect how we metabolize meals. The PREDICT study, conducted at King’s College London, assessed blood levels of fat, insulin, and sugar indicators in twins both before and after they ate. Despite having the same DNA profile, the twins were discovered to react differently to meals. The study showed that DNA testing alone might not provide a whole picture, focusing instead on environmental factors and the significance of the gut flora. Further investigation into this new field of study is necessary due to the difficulties in sorting out these variables.
In the clinic, customized eating
Through the use of therapeutic diets for health optimization, personalized nutrition has made its way into the clinical setting. An allergen-free diet designed to eliminate immunological triggers is a good illustration. Diets like these might need to be devoid of peanuts, gluten, tree nuts, low in fermentable carbs (FODMAPS), casein, and dairy.
Plans like these are recommended for people with established allergies, intolerances, and sensitivities as well as for the identification of undiscovered triggers through elimination. The allergen-free diet is customized based on each person’s reaction, immune response type, and additional considerations like enzyme deficiency or gastrointestinal issues.
Implementing individualized nutrition presents challenges.
First, nutritional specialists are eager to overcome the obstacle posed by the growth of bioinformatics and the abundance of data at our disposal. These datasets require extensive collection, organization, and analysis, which is costly and time-consuming. The outcomes of clinical trials may be dubious due to a lack of reproducibility, and the intricacy of the data may allow for contentious conclusions to be derived from it.
The question of education is another. It is the responsibility of the whole healthcare team to ensure that registered dietitians and primary care physicians, as well as other nutritional practitioners, are informed about the most recent advancements in the field of customized nutrition. Lastly, further thought needs to be given to the ethical and legal issues, such as protecting consumer privacy when using technology and testing.
