Biological effects of food and types of nutrition
Depending on the biological impact of the consumed food on the human body, hygiene science identifies four main types of nutrition:
- Healthy rational nutrition
- Prophylactic nutrition
- Preventive nutrition
- Medical nutrition
The fundamental concept is healthy nutrition. Its main characteristic is complete harmlessness and safety for the consumer. Ensuring such safety cannot be limited to personal choice; it requires strict state-level control. Key state protection measures include a rigorous fight against food fraud and continuous monitoring of food additive content. State authorities are obliged to closely monitor the concentration of colorants, preservatives, stabilizers, emulsifiers, flavorings, and various flavor enhancers to prevent toxic effects on the population.
Rehabilitation function of food
The primary task of medical nutrition lies in its rehabilitation function. This is the ability to purposefully influence the recovery processes of sick individuals using strictly regulated diets and specialized dietary products. In this case, food acts as a full-fledged therapeutic factor.
The clinical significance of this approach is immense. Medical nutrition plays a leading role in the therapy of a number of pathological conditions:
- Diabetes mellitus, which requires strict control of carbohydrate metabolism.
- Obesity, which necessitates the correction of energy balance.
- Compromised nutritional status, which requires active nutritional support (a classic example is the rehabilitation of patients suffering from pulmonary tuberculosis).
Specifics of dietary products
Special dietary products are used to organize an effective medical nutrition process. Their main difference from standard provisions lies in a modified composition adapted to the needs of a specific disease. Changes may affect various nutrients:
- Reduced sodium chloride content: a so-called achloride bread is produced for patients with specific indications, excluding excess sodium.
- Reduced fat content: fat-free variants of familiar products such as cottage cheese, milk, and butter are introduced into the diet.
- Modified carbohydrate composition: traditional sugar is replaced by its analogs and substitutes. These include xylitol, sorbitol, and a number of artificial sweeteners such as aspartame, saccharin, sladex, and NutraSweet.
- Modified energy value: depending on the therapeutic goal (e.g., in obesity or, conversely, emaciation), products with artificially reduced or increased calorie content are created.
Flavoring agents and digestion stimulation
Flavoring agents are an important component of any diet, including those used for therapeutic purposes. Their biological role consists of a powerful stimulating effect on the motor apparatus of the digestive system. Under their influence, digestive processes sharply improve, the state of the internal environment normalizes, and the overall tone of the body increases.
Flavoring agents are usually classified into three major groups:
- Spices: pepper, cinnamon, cloves, ginger, cardamom, bay leaf, caraway, star anise, coriander, mustard.
- Piquant herbs: parsley, dill, onions, garlic, horseradish, tarragon.
- Artificial (synthetic) substances: vanillin, various fruit and spice essences, food acids.
Briefly: answers to topical questions
How does preventive nutrition differ from prophylactic nutrition?
Preventive nutrition differs from prophylactic nutrition in its target audience, mechanism of action, and ultimate goals.
| Characteristic | Prophylactic nutrition | Preventive nutrition |
|---|---|---|
| Target group | Healthy individuals in adverse occupational environments | Healthy individuals belonging to risk groups |
| Basis of action | Protective action of food | Nonspecific action of food |
| Goal | Increasing the body's resistance to harmful factors | Preventing (the development of pathologies) |
Which Pevzner diet numbers are prescribed for diabetes mellitus and obesity?
For diabetes mellitus, a special diet No. 9 according to the Pevzner system is prescribed. The exact diet number for treating obesity is not specified in the sources, but it is noted that medical nutrition plays a leading therapeutic role in obesity. In general, the system of standard diets is used in medical and preventive institutions to optimize and manage the quality of patient nutrition.
What are the basic principles of formulating therapeutic diets?
The basic principles of formulating therapeutic diets include a systemic approach to the body and adaptability to the course of the disease.
- Effect on the whole body — nutrition affects not just the diseased organ in isolation, but the entire body. A targeted reduction in the intake of certain nutrients is allowed, but strictly not below the minimum physiological requirement.
- Principle of dynamism — the nature of nutrition changes depending on the stage of the disease.
What is the physiological mechanism of action of flavoring agents on the digestive system?
Flavoring agents stimulate the motor apparatus of the digestive system to active work and improve digestion. For bitter substances, the following mechanism is described: irritation of taste receptors in the oral mucosa causes a reflex increase in the secretion of digestive glands. Chemotransduction involves the binding of flavoring agents to membrane receptors on the microvilli of sensory cells, changes in the activity of membrane enzymes and the concentration of intracellular mediators, changes in the state of ion channels, and a shift in the membrane potential; excitation is transmitted via synapses to afferent fibers.
To memorize the three groups of flavoring agents, use the SPI abbreviation: Spices (pepper, cloves), Piquant herbs (onions, garlic), Artificial substances (vanillin, essences).
Class and exam questions
What is the rehabilitation function of food?
It consists in the ability to purposefully influence the recovery processes of patients through the use of special diets and dietary products that correct impaired body functions.
In which pathologies does clinical nutrition play a leading therapeutic role?
First and foremost, it is essential for diabetes mellitus, obesity, and for correcting a compromised nutritional status, such as in pulmonary tuberculosis.
How do dietary products differ from regular food products?
They possess specific properties: a reduced amount of sodium chloride, a reduced proportion of fats, a modified carbohydrate composition (sugar substitutes), or a modified energy value.
Why are flavoring substances added to the diet?
They stimulate the activity of the motor apparatus of the digestive system, thereby dramatically improving digestion and stabilizing the internal environment of the body.
What else to study on this topic
- Mechanisms of state control over food product fraud
- Differences between prophylactic and preventive types of nutrition
- Pharmacokinetics of artificial sugar substitutes (aspartame, saccharin, NutraSweet)
- Impact of food additives (preservatives, stabilizers, emulsifiers) on metabolism
- Production technology of chloride-free bread and fat-free dairy products
Master the entire topic in the "Hygiene" course
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Other topics in "Chapter 5. Ecological and hygienic problems of population nutrition"
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