Nutritional Genomics is the field of research where traditional nutrition meets modern genomic knowledge.
Nutritional Genomics is the field of research where traditional nutrition meets modern genomic knowledge.
Nutritional Genomics has transformed nutrition: from classical to molecular.
Nutritional Genomics aims at developing not only personalized, but also precise lifestyle and nutritional programs to prevent common, multifactorial diseases.
There are many benefits of using genomics to help determine your diet. One of these is preventing complex diseases.
This future is here.
The supermarket of today will be the pharmacy of tomorrow. Hippocrates (460-370 B.C.) said:
“Let the medicine be your food, and the food be your medicine.”
Nutritional Genomics has the goals of:
Nutritional Genomics is divided into two different -but collaborating- sister areas.
These areas are, in fact, two sides of the same coin: nutrigenetics and nutrigenomics.
Both focus on the interaction between nutrition, genes, and health outcomes. However, there are important conceptual differences in the information, and we can obtain information from each of them.
ONE SIZE DOES NOT FIT ALL.
Nutritional genomics helps explain the different individual responses people have when they are given the same nutritional treatment.
Nutrigenetics studies how our genes determine the effects what our food has on us. This genetic “make-up” is what makes us unique. It includes individual pigments and character traits.
Nutrigenetics is the scientific area that identifies what parts of our inherited traits can be modified by what we eat, how we act, and how to make these changes. Our genetic make-up consists of numerous genetic markers, mainly SNPs (Single Nucleotide Polymorphisms) which do not change throughout our lives. We are born with this “genetic fingerprint”.
Changes to our SNPs means changes to one of the four letters of our DNA sequence. What does a change to a single letter mean? Think about letters, words and sentences.
Think of the difference between FAT and FIT.
If we replace the A with an I, the meaning of the word changes entirely.
Conversely, think of a woman named ANNA. She will always respond to us, whether we spell her name with one N (ANA) or two (ANNA). Here, a one letter difference, a spelling mistake, does not change the meaning of the word.
Nutrigenetics identifies the letters in the “words” of our DNA “book” and compensate them through dietary and lifestyle changes.
Nutrigenomics studies how nutrition and concrete dietary patters modulate the expression of our genes as a whole. Gene expression can change throughout life and environmental or external factors can have a huge impact on this change, whether it is a positive or a negative one.
In this new Nutrigenomics era, the importance of genes in human nutrition has been in the spotlight. The focus of the nutritional field has shifted towards detailed molecular studies of nutrition that focus more on preventing complex and chronic diseases, rather than solely nutritional deficiencies.
WHAT NUTRITIONAL GENOMICS IS NOT.
Nutritional Genomics is not a miracle or a magic diet.
Starting after the human genome was first fully sequenced in 2001, valuable new bodies of data were made available to scientists of all disciplines to explore the interactions between our genetic and genomic information with environmental factors such as a diet.
The human genome contains approximately 2.9 billion nucleotides or 30,000 genes, some of which are involved in metabolic pathways. Most of the genes that have been identified do not directly cause complex diseases, but rather enhance our susceptibility and predisposition.
A wide range of biochemical and molecular pathways are involved in this predisposition. A wide range of biochemical and molecular pathways are involved in this predisposition. The genomic revolution of the 21st century facilitated the study of the genes in the connected of nutrition and soon, nutritional genomics was born as a scientific discipline.
The interaction between genes and one’s diet has always been fundamental to human health. Their interaction has been an integral component of human evolution. The continuous cross-talk between genes and diet has helped humanity survive and evolve. Examples of how a food or a component of food can affect a person’s health status have been known for some time.
For example, the hemolysis that my occur after fava bean consumption in people with the glucose-6 dehydrogenase deficiency, or the dietary problems people with a genetically determined lactose intolerance or gluten-sensitive enteropathies are some of the most well-known cases.
Nutrition aims to find a fine-tuned balance between the processes and metabolic pathways in order to maintain homeostasis and promote health. Diet plays an essential role in preventing and developing many complex and chronic diseases. Although we might have a genetic predisposition to either suffer or immunity from a certain illness or condition, it is our lifestyle that determines whether or not we develop it.
.We can reduce our inherited risk of diabetes, heart disease, or obesity by making healthy choices from a very early age.
Prevention is always better than treatment
The outcome of nutritional genomics studies should always be analyzed in parallel with mechanistic, clinical, and/or epidemiological data that is available for the compound and/or patter understudy. Using bioinformatics tools to link information between the genome, transcriptome, proteome, and metabolome is a major challenge.
Bioinformatics tools are necessary for the interpretation of changes in genes related to specific nutrients or dietary patterns whose function is still unknown. Special bioinformatic software packages are required for the challenging analysis of these outputs. Grouping genes based on functional similarity can help to enhance the biological interpretation of large lists of genes. It also been shown that disease-related genes tend to interact and display significant functional clustering.
Genes associated with similar disorders show both a higher likelihood of physical interactions between their products and a higher expression profiling similarity. That supports the existence of distinct disease-specific function modules. Subtle changes in our DNA can now be measured by quantitative techniques such as high-density microarrays, real-time poly-chain reaction (PCR) and of course, sophisticated sequencing methods.
The high potential and novelty of nutrigenetic results has rapidly attracted the attention of the market. Consumers must look and pay careful attention to whether the concrete criteria of a nutrigenetic tests is filled before considering a test valid and based on scientific evidence.
The laboratory procedure.
Genotyping is the main laboratory analysis performed in actual nutrigenetic tests. Certified and validated procedures should be used to perform genotyping analysis. This laboratory should also be accredited by official bodies and periodically audited to confirm compliance.
The interpretation of the results.
A pure presentation of genotyping results is not enough for understanding and interpreting the deep meaning of nutrigenetics. Close assistance and coaching is essential to correctly comprehend and incorporate all necessary changes into one’s lifestyle and everyday habits. This can only be performed by specially trained and experienced professionals in the nutritional genomics field.
Nutrition is the only environmental factor we are exposed to on a daily basis. It is also the only environmental factor that we have total control over throughout our lives. Nutrition is involved in the pathogenesis and progression of polygenetic and complex diseases.
From a nutritional genomics point of view, nutrients act as dietary signals. Cells detect their signal and they transmit it, thus influencing gene and protein expression, and subsequently, metabolite production. The molecular structure of each nutrient determines the concrete signal emitting and the concrete pathways that this signal will affect. Even a small structural change (e.g. SFA vs MUFA or cholesterol vs plant sterols) have a deep impact on the activation of the affected pathways.
Nutrigenomics and nutrigenetics aim at identifying genes that influence the risk of diet-related, complex diseases on a genome-wide scale. It is of high importance to highlight that nutrigenomics and nutrigenetics examine the whole complexity and variability of nutrition.
The molecular structure of each nutrient determines the concrete signal emitting and the concrete pathways that this signal will affect. Even a small structural change (e.g. SFA vs MUFA or cholesterol vs plant sterols) have a deep impact on the activation of the affected pathways.
The vast majority of the complex diseases are mainly chronic ones. They characterized by complex phenotypes without the “one gene-one disease” approach. Numerous genes are responsible for the appearance and progression of these diseases, and we cannot “blame” only one of them. They are what we nominated as polygenic diseases.
Complex diseases, such as cardiovascular disease (CVD), Type II Diabetes Mellitus (T2DM) and obesity are also multifactorial. CVD is the leading cause of death in the industrialized countries. Currently, CVD accounts for more than 12×106 annual deaths worldwide, and it is one paradigm of multifactorial disorders where multiple genetic and modifiable risk factors are combined to modulate the disease outcome. Multifactorial diseases need numerous factors and/or conditions to cluster together in the same person, before their appearance.
Genetic and environmental factors are the key factors for the appearance of complex diseases.
These complex and multifactorial diseases require an improved overview (holistic) picture of their early phases to achieve prevention. The complex nature of these diseases includes the interaction of several mechanisms, at molecular level, which, up to now, were only partly known. Nutrigenetics and nutrigenomics exploit the multiple, minor and synergistic changes in genomic and genetic responses related to nutrition and health, instead of focusing on the single “target” response which is common in drug therapy.
How “much” genetic and how “much” environmental factors contribute for each disease and for each person, is not clear and it is a totally personalized issue.
Each one of us deserves a, not only a personalized, but also a precision treatment when it comes to complex diseases.
Large national and international research organizations in the Nutritional Genomics field are being formed to jointly address the great scientific challenges (Figure). Their success is based on a collaborative effort among scientists from different disciplines such as nutrition, molecular biology, biomedicine, genomics, bioinformatics among others.