Modern human nutrition issues
The diet of the population of the Russian Federation is undergoing adverse changes. Two main problems are distinguished:
- Decrease in food quality. Food is contaminated with foreign substances (xenobiotics): pesticide residues, heavy metals, aflatoxins, antibiotics, and preservatives.
- Lack of essential nutrients. There is a deficiency in the consumption of animal products, vegetables, and fruits. As a result, the body lacks essential amino acids, iron, calcium, vitamins (including ascorbic acid and beta-carotene), dietary fiber, and trace elements (copper, selenium, cobalt).
New ecological and hygienic challenges
Technological development poses new questions for medicine that require detailed study prior to mass introduction:
- Transgenic (GM) foods. Genomically modified crops (soybeans, corn, potatoes) are pest-resistant and yield high harvests, but their inclusion in human metabolism carries potential risks. International studies are needed to assess long-term consequences, just as it historically was required for the insecticide DDT.
- Nanotechnology and nanobiotechnology. The use of particles up to 100 nm in size opens up huge prospects (targeted drug delivery, nanoimplants), but also harbors serious threats due to the properties of these materials.
Nanoparticles: properties and hazards
Nanoparticles (fullerenes, nanotubes, peapods) have unique physical characteristics: they are stronger than steel, biocompatible, can self-assemble, and cross histohematic barriers.
However, they pose a serious hazard to living organisms:
- Carcinogenicity — capable of causing cancer (similar to asbestos nanofibers).
- Pro-oxidant activity — initiate and maintain inflammation.
- Genotoxicity — destroy the genetic apparatus.
Due to such risks, products containing nanomaterials in the Russian Federation are subject to mandatory sanitary control, safety confirmation, and labeling.
Signs of ecological distress in territories
Anthropogenic impact (depletion of fossil fuels, alteration of riverbeds, creation of artificial seas) disrupts a favorable ecological environment. This directly affects public health.
Markers of an unfavorable situation:
- Demographics and children: increase in infant and child mortality, delayed physical development, surge in chronic diseases in children.
- Genetics: increase in the number of congenital malformations and cell mutations.
- Adult population: increase in oncology, chronic diseases of the respiratory, nervous, and cardiovascular systems, decrease in life expectancy, and deterioration of reproductive health.
- Toxicology: detection of toxic substances in human biological media.
Depending on the severity of these problems, territories can be classified as zones of ecological disaster or an emergency ecological situation.
Briefly: answers to topical questions
What histohematic barriers can nanoparticles cross?
Nanoparticles are able to cross any protective histohematic barriers of the body, including the blood-brain barrier. In nanotechnological approaches, nanoparticles are used to deliver medicinal substances to the central nervous system, including peptides and substances normally eliminated by P-glycoprotein.
What natural biogeochemical anomalies negatively affect human health?
Negative impacts on health are caused by abnormal natural biogeochemical provinces in which soils show a deficiency or excess of chemical elements. This can lead to the development of the following geochemical endemics:
- Dental caries — caused by a lack of fluorine.
- Fluorosis — caused by an excess of fluorine.
- Endemic goiter — caused by an iodine deficiency.
- Endemic gout — caused by an excess of molybdenum.
- Chondro- and osteodystrophy — caused by an excess of strontium.
- Keshan disease — endemic cardiomyopathy caused by selenium deficiency.
- Kashin–Beck disease — caused by a profound calcium deficiency combined with mycotoxin poisoning by fungi of the genus *Fusarium*.
- Methemoglobinemia — occurs due to an excess of nitrates.
What are the pathways for xenobiotics from the environment to enter the human body?
Xenobiotics and foreign chemical substances regularly enter the human body via three main pathways.
The distribution of intake pathways from the contaminated environment is as follows:
- Alimentary pathway (oral) — 70% of toxicants enter with food (migration through food chains from soil, water, and air).
- Inhalation pathway — 20% of substances enter with air.
- Waterborne pathway — 10% of xenobiotics enter with water.
Additionally, percutaneous and transmucosal pathways (absorption through intact skin and mucous membranes) as well as parenteral penetration of poisons are distinguished.
Class and exam questions
Why is DDT cited as an example when discussing GMOs?
The creator of DDT received the Nobel Prize for success in combating disease vectors, but severe environmental consequences later emerged. This emphasizes the need to study the long-term effects of any new technologies, including transgenic foods.
Are bacteria nanoparticles?
No, bacteria are significantly larger and are not classified as nanoparticles. Nanoparticle sizes range from a few angstroms to 100 nanometers (like protein molecules or viruses).
What is a favorable environmental situation?
This is a state of the environment without dangerous anthropogenic impact and without natural anomalies (climatic, biogeochemical) that negatively affect human health.
What else to study on this topic
- Classification of xenobiotics in food products
- Mechanisms of genotoxicity and carcinogenicity of nanoparticles
- Principles of hygienic regulation of nanotechnology in the Russian Federation
- Assessment of long-term effects of transgenic foods
- Criteria for designating zones of ecological disaster
Master the entire topic in the "Hygiene" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "The impact of environmental pollution on health" and 530 more pages of the subject
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- 95 video lessons for the subject
Other topics in the section "Introduction. Subject, History, Modern Environment"
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.