on September 07, 2026
From the philosophy of natural wellness to medicine based on biological mechanisms
The idea that diet and lifestyle can play a decisive role in human health is today one of the most interesting points of convergence between preventive medicine, physiology, clinical nutrition, and molecular biology. The human body does not respond exclusively to the presence or absence of calories: every food item introduces nutrients, metabolites, and bioactive molecules capable of interacting with enzymes, receptors, hormones, the microbiota, the immune system, and cellular signaling networks.
The concept of Biomolecular Nutrition can be placed in this perspective: a model that interprets food not merely as energy fuel, but as a set of biological information capable of influencing the functioning of the organism.
Modern physiology confirms that nutrients and metabolites participate in numerous regulatory systems. Fatty acids can act as ligands for nuclear and membrane receptors; amino acids regulate metabolic pathways and nutrient-sensing systems; glucose influences insulin secretion and numerous neuroendocrine circuits; dietary fiber is transformed by the microbiota into metabolites such as short-chain fatty acids, capable of influencing the intestinal epithelium, energy metabolism, and immune response.
The concept of a "signal" applied to nutrition must therefore be interpreted in a concrete biological sense. A food item does not send a single message to the organism: it generates a complex metabolic and neuroendocrine response, influenced by the composition of the meal, the frequency of eating, the quality of the diet, physical activity, sleep, the microbiota, and individual characteristics.
This complexity makes it necessary to overcome both a reductionist view of food as a simple sum of calories and the opposite idea that every natural substance is automatically therapeutic or harmless. Natural does not necessarily mean harmless, just as a drug does not necessarily represent a simple suppression of symptoms. Preventive medicine, nutrition, pharmacology, and lifestyle interventions should be considered potentially complementary tools, to be used according to appropriate indications and scientific evidence.
The World Health Organization identifies a balanced, varied diet, rich in plant-based foods and based mainly on whole grains, fruit, vegetables, and legumes as one of the main tools for preventing non-communicable diseases. Particular importance is attributed to the quality of fats, the reduction of free sugars, the elimination of industrial trans fats, and an adequate intake of dietary fiber.
Food as a regulator of cellular homeostasis
The cell represents the fundamental functional unit of the organism. To maintain its structure and functions, it continuously needs energy, amino acids, essential fatty acids, vitamins, minerals, and numerous other substrates.
Cellular renewal therefore requires an adequate nutritional environment. The quality of the diet can influence the availability of metabolic substrates, protein synthesis, the composition of cell membranes, mitochondrial energy production, and the response to oxidative stress.
The expression feeding the cell can therefore take on a scientifically correct meaning if interpreted as the ability of nutrition to provide the nutrients necessary to maintain homeostasis.
However, there is no scientifically defined category of foods that are universally "compatible" or "incompatible" with human enzymes. The human digestive system is characterized by remarkable metabolic plasticity and is capable of utilizing a wide variety of substrates.
The nutritional quality of a food item depends rather on multiple factors: nutrient density, degree of processing, fiber content, quality of fats, amount of free sugars, excess salt, contaminants, preparation methods, and total quantity consumed.
In this sense, the concept of macronutrition can be reinterpreted as attention to the balance between proteins, carbohydrates, and fats and their biological quality, while micronutrition concerns the correct intake of vitamins, minerals, and other essential or biologically active substances.
Nutritional prevention therefore does not consist in indiscriminately eliminating categories of foods, but in building a dietary model capable of meeting individual needs while reducing chronic exposure to nutritional factors associated with an increased metabolic risk.
Diet quality and prevention of chronic diseases
One of the strongest pieces of evidence in contemporary nutrition is that it is not a single food item that determines health, but the overall dietary pattern.
A diet rich in plant-based foods, legumes, fruit, nuts, whole grains, and sources of unsaturated fats is associated with better metabolic and cardiovascular outcomes compared to dietary patterns characterized by high consumption of highly processed foods, free sugars, trans fats, and energy-dense products.
The PREDIMED study represented one of the most important clinical studies on the Mediterranean dietary pattern. In subjects at high cardiovascular risk, assignment to a Mediterranean diet supplemented with extra virgin olive oil or nuts was associated with a lower incidence of major cardiovascular events compared to the control group.
The degree of industrial processing of foods also appears to be biologically relevant. In a randomized study conducted in a controlled environment, a diet consisting of ultra-processed foods spontaneously resulted in higher energy intake and weight gain compared to a minimally processed diet, despite maintaining comparable declared nutritional characteristics of the two dietary regimens.
This finding suggests that the regulation of food intake does not depend exclusively on the chemical composition reported on the label. Palatability, consistency, speed of ingestion, energy density, and degree of processing can influence the organism's response.
The goal of preventive nutrition should therefore not only be the quantitative reduction of food, but the improvement of its quality.
Biomolecular nutrition and the intestinal barrier
The intestine represents one of the main points of contact between the organism and the external environment. Its function does not simply consist in absorbing nutrients: it must simultaneously allow the selective passage of useful molecules and limit the penetration of microorganisms and potentially harmful substances.
The intestinal barrier is composed of multiple components: microbiota, mucus layer, epithelial cells, tight junctions, immune system, and structures present in the lamina propria.
The concept of intestinal permeability has gained increasing relevance in research, but it must be used with precision. Not all diseases can be attributed to a generic "leaky gut," and there is no scientific evidence that protein fragments from normal digestion represent a universal cause of chronic diseases.
However, there is solid evidence that diet, microbiota, and intestinal barrier integrity are closely linked.
Several nutrients and food components can influence barrier function. Dietary fiber promotes the microbial production of short-chain fatty acids, such as butyrate, which represents an important energy source for colonocytes and participates in the regulation of epithelial function.
A literature review has highlighted that different dietary components can influence intestinal permeability, while a recent systematic review has underlined that, in healthy subjects, the available clinical evidence is still insufficient to attribute universal and definitive effects to specific dietary patterns.
This distinction is important: the relationship between nutrition and the intestinal barrier is biologically plausible and supported by numerous experimental data, but many clinical applications still require higher-quality controlled studies.
From the concept of toxin elimination to the physiology of defense systems
The language of natural medicine often uses concepts such as "detoxification" and "toxin elimination." In modern physiology, it is possible to translate some of these concepts by referring to the biological systems actually responsible for the transformation and elimination of substances.
The liver, kidneys, intestine, lungs, and immune system do indeed participate in the management and elimination of metabolites and compounds foreign to the organism.
The liver possesses enzymatic biotransformation systems that modify numerous endogenous and exogenous substances. The kidneys regulate the elimination of water-soluble metabolites. The intestine contributes to the elimination of compounds through bile and feces.
However, it is necessary to avoid the interpretation that unidentified food substances inevitably accumulate in cells, producing a generic "accumulation pathology." This expression does not belong to the scientific classification of diseases.
More correctly, some environmental and dietary exposures can increase biological risk through specific mechanisms: oxidative stress, inflammation, endocrine alterations, DNA damage, or metabolic modifications.
Nitrosamines, aflatoxins, and other contaminants are examples of compounds for which specific toxicological mechanisms exist. For these substances, the most effective prevention consists above all in reducing exposure, ensuring food chain safety, and complying with health regulations.
The scientifically more solid concept is therefore not that of "neutralizing any negative substance" through natural supplements, but that of reducing exposure to risk factors and supporting, through adequate nutrition, the normal physiological functions of the organism.
The discovery of leptin and the birth of adipose tissue as an endocrine organ
One of the fundamental turning points in the understanding of metabolism was the discovery of the ob gene and leptin in 1994.
The work of Zhang and colleagues identified the product of the ob gene and contributed to defining the existence of a communication system between adipose tissue and the brain involved in the regulation of energy balance.
Adipose tissue must therefore not be considered simply as a passive energy store. It is a metabolically and endocrinologically active organ, capable of producing numerous signaling molecules called adipokines.
Among these, leptin, adiponectin, resistin, and numerous other molecules involved in communication between adipose tissue, the immune system, liver, muscle, and central nervous system are particularly relevant.
Leptin represents one of the main signals related to the availability of energy reserves. However, its physiological function cannot be reduced to the simple statement that "more leptin means more weight loss."
In common obesity, leptin is often increased, but a condition of reduced biological response called leptin resistance can develop. Body weight regulation therefore depends on a much more complex system that includes energy availability, body composition, genetics, sleep, physical activity, nutrition, and neuroendocrine signals.
Adipokines, enterokines, and communication between the intestine, adipose tissue, and brain
The organism is traversed by a continuous network of biochemical communications.
Adipose tissue produces adipokines. The gastrointestinal tract produces or stimulates the production of intestinal hormones. The pancreas secretes insulin and glucagon. The nervous system integrates information from the periphery and coordinates metabolic responses.
Among the most important intestinal signals are ghrelin, cholecystokinin, GLP-1, and other peptides involved in the regulation of appetite, satiety, and glucose metabolism.
These molecules help explain why body weight control cannot be interpreted simply as a matter of individual willpower.
The composition of the meal, its energy density, the presence of protein and fiber, the speed of ingestion, and the degree of satiety influence complex biological systems.
Modern metabolic medicine can therefore be considered, in a sense, a medicine of signals. However, there is no single hypothalamic switch capable of simply switching from "storage" mode to "consumption" mode. The system consists of multiple and dynamic neuroendocrine networks.
Calorie restriction, metabolic adaptation, and weight loss
The debate on calorie restriction must be approached by avoiding two opposite simplifications.
The first is the idea that it is enough to reduce calories without considering diet quality, satiety, body composition, and sustainability.
The second is the claim that calorie intake has no importance.
From a physiological point of view, the energy balance remains fundamental for body mass variation. However, the energy balance is not a simple arithmetic operation independent of biology.
Energy restriction can produce metabolic adaptations, changes in appetite, and changes in body composition. For this reason, the most sustainable weight loss programs must consider not only weight, but also muscle mass, eating behavior, diet quality, and physical activity.
A recent systematic review has also highlighted that strategies based on the timing of meals can offer some benefits in specific conditions, but their additional advantage compared to equivalent energy restriction is not yet uniformly demonstrated.
The most rational approach is therefore to seek an energy intake appropriate to the person's goals, avoiding extreme restrictions and favoring sustainable strategies.
Breakfast, meal timing, and biological rhythm
The distribution of food throughout the day can influence metabolic regulation.
Human metabolism is indeed subject to circadian rhythms. Insulin sensitivity, hormone secretion, hunger, and response to nutrients are not necessarily identical at every time of day.
A proper breakfast can contribute to satiety and control of food intake in the following hours, especially when it contains protein, high-fiber foods, and high-quality nutrients.
However, there is no evidence that a large breakfast is universally necessary for weight loss or that its absence automatically causes a metabolic slowdown.
The response must be personalized, considering habits, diet composition, physical activity, sleep, and clinical conditions.
The most important principle remains the construction of a stable, nutritionally adequate eating pattern compatible with the individual's pace of life.
The quality of carbohydrates as a metabolic signal
Not all carbohydrates produce the same biological response.
The structure of the food, the presence of fiber, the degree of refinement, the physical form, and the speed of digestion influence the glycemic and insulin response.
For this reason, the World Health Organization recommends that a significant part of carbohydrates come from whole grains, vegetables, fruit, and legumes. Free sugars should be limited.
A food rich in fiber also tends to produce greater satiety and be metabolized differently compared to a refined product containing similar amounts of available carbohydrates.
The goal should therefore not be to indiscriminately demonize carbohydrates, but to improve their quality.
Fiber, microbiota, and signaling metabolites
Dietary fiber represents one of the main links between diet and microbiota.
Many fibers are not completely digested by human enzymes and reach the colon, where they can be used by different microbial communities.
Fermentation produces metabolites such as acetate, propionate, and butyrate.
These molecules should not be considered simply as waste products. They can participate in communication between the microbiota and the host organism, influencing energy metabolism, intestinal epithelium function, and some immune mechanisms.
The relationship between fiber, microbiota, and health therefore represents one of the most evident examples of nutrition as a biological signaling system.
Dietary diversity, especially within plant-based sources, can contribute to the diversification of substrates available to the microbiota. However, there is no universal diet capable of producing the same microbiota in all individuals.
Physical movement as a metabolic signal
Physical activity profoundly changes metabolism.
Skeletal muscle is an important endocrine and metabolic organ. During muscle contraction, numerous signaling molecules are produced and released, frequently referred to as myokines.
Physical exercise also improves insulin sensitivity, contributes to the maintenance of muscle mass, modifies lipid metabolism, and produces favorable effects on cardiovascular function.
For this reason, it would be reductive to consider movement exclusively as a system to "burn calories".
Physical activity represents a true biological stimulus capable of influencing metabolism in the long term.
The combination of adequate nutrition and physical activity also allows for addressing weight control by prioritizing the improvement of body composition compared to the simple reduction of the number indicated by the scale.
Inflammation, nutrition, and scientific precision
Nutrition can influence some inflammatory processes, but it is necessary to avoid the indiscriminate use of the term "food inflammation".
Food allergies are specific immunological reactions and must be distinguished from other gastrointestinal or metabolic conditions.
It is not correct to use non-validated tests to generically classify all foods as responsible for inflammation or weight gain.
In particular, the presence of IgG antibodies against a food does not represent in itself evidence of pathological intolerance. Research and scientific guidelines require a rigorous diagnostic approach before eliminating food groups.
Nutrition can certainly contribute to modulating the metabolic and immunological context of the organism. However, the concept of nutritional personalization must be based on clinical data, medical history, any diagnoses, and verifiable individual characteristics.
Signaling medicine: an integrated perspective, not an absolute alternative to medicine
Modern medicine already uses, to a large extent, the concept of biological signaling.
Hormones, neurotransmitters, receptors, cytokines, and metabolites constitute fundamental communication systems.
Lifestyle interventions can also modify these systems.
Nutrition, sleep, physical activity, stress management, and body composition influence numerous physiological circuits.
This does not mean, however, that every pathological condition can be corrected simply by stimulating the organism "from the inside".
In the presence of hypothyroidism, diabetes, hypertension, depression, osteoporosis, or other pathologies, lifestyle can be fundamental but must not lead to the autonomous suspension of effective pharmacological therapies.
The most modern approach is the integrated one.
When appropriate, pharmacological therapy controls specific pathological mechanisms. In parallel, nutrition and lifestyle can act on risk factors, metabolic function, and the prevention of complications.
The opposition between "natural" and "pharmacological" is therefore often scientifically unproductive. The real goal should be to use every tool based on the relationship between efficacy, safety, and clinical appropriateness.
Biological synergy as a principle of nutrition
One of the most interesting aspects of natural foods is their molecular complexity.
A food generally does not contain a single biologically active molecule. It contains macronutrients, micronutrients, fiber, and numerous bioactive compounds.
This complexity can produce integrated effects that can hardly be attributed to a single substance.
The concept of synergy, however, must be used with caution. It is not sufficient that two molecules are present together to scientifically demonstrate a synergistic effect.
Biological synergy requires experimental demonstration of the interaction between the components.
In the field of nutrition, it is therefore more correct to speak of a food matrix and of biological interactions between nutrients and bioactive compounds.
The same principle can be applied to the formulation of food supplements: the presence of multiple ingredients does not automatically guarantee greater efficacy, while the usefulness of a combination should be evaluated considering dosages, bioavailability, interactions, and available data.
From prevention to reversibility: what can really change
The concept of reversibility exerts a strong fascination because it suggests the possibility of modifying the biological course of a condition.
Scientific research indeed demonstrates that many metabolic factors are dynamic.
Body weight, blood pressure, blood glucose, insulin sensitivity, lipid profile, and some risk markers can improve through lifestyle modifications and, when necessary, through pharmacological treatments.
However, not all diseases are reversible and not all biological alterations can be returned to a previous state.
The most correct concept is that of biological plasticity.
The organism is capable of adapting and modifying many of its functions in response to environmental stimuli. Nutrition and lifestyle represent a fundamental part of these stimuli.
In some cases, they can prevent a disease. In others, they can improve its risk factors or contribute to clinical control. In others still, their role is complementary to medical therapies.
The value of prevention consists precisely in acting before biological alterations become irreversible.
A modern model of biomolecular nutrition
In light of the available knowledge, a scientifically updated model of Biomolecular Nutrition can be based on several principles.
The priority is represented by the quality of the diet, with a high presence of plant-based foods, vegetables, fruit, legumes, whole grains, and predominantly unsaturated fat sources.
The second priority is variety. A greater diversification of food sources increases the probability of meeting nutritional needs and providing different metabolic substrates.
The third concerns the reduction of highly refined and ultra-processed foods, especially when rich in free sugars, salt, and low-quality fats.
The fourth consists in considering nutrition together with physical movement. Nutrition and muscle activity represent complementary biological signals.
The fifth concerns personalization. Age, body composition, physical activity, clinical conditions, medications, and individual goals must be considered before building specific strategies.
The sixth consists in maintaining a rigorous distinction between prevention, physiological support, and disease treatment.
The philosophy of nature in light of contemporary medicine
The rediscovery of the relationship between man and the natural environment can today take on a scientifically modern meaning.
It does not mean automatically idealizing everything that is natural nor rejecting conventional medicine.
It means recognizing that the human organism is the result of a long biological history and that its physiology continuously responds to stimuli from the environment.
Food, movement, sleep, light, the circadian rhythm, and interactions with the environment represent signals capable of influencing biology.
The real innovation of the biomolecular approach can therefore consist in moving from purely quantitative nutrition to a systemic view.
Not just calories, but quality.
Not just weight, but body composition.
Not just individual nutrients, but the food matrix.
Not just the gut, but the gut-microbiota-immunity axis.
Not just adipose tissue, but an endocrine organ.
Not just diet, but the integration of diet, physical activity, sleep, and lifestyle.
Man is not a simple calorie machine. He is a complex biological system, capable of continuously perceiving, integrating, and transforming signals from the environment.
Biomolecular Nutrition can therefore represent a useful language to describe this complexity, provided it is constantly updated in light of scientific evidence and does not turn biologically interesting hypotheses into clinical certainties before they have been proven.
The future of nutrition will probably be increasingly based on individual differences rather than universal rules. Genetics, metabolism, body composition, microbiota, eating behavior, and lifestyle can all contribute to developing increasingly personalized strategies.
The goal should not be to replace medicine, but to recognize nutrition as one of the most powerful tools through which the organism interacts daily with its environment.
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Bibliographic references
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