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CNS Depressants: Alcohol and Nicotine01:27

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Ethanol, a clear colorless alcohol, has been consumed by humans for millennia, but its effects on the body are far from benign. At lower doses, it induces decreased inhibitions and loquaciousness, leading to its social appeal. However, it can cause severe consequences at higher doses, such as coma and respiratory depression, due to its zero-order elimination kinetics. Chronic ethanol abuse wreaks havoc on multiple organ systems, particularly the CNS and the liver. Abrupt cessation of ethanol...
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Like water, alcohols are weak acids and bases. This is attributed to the polarization of the O–H bond making the hydrogen partially positive. Moreover, the electron pairs on the oxygen atom of alcohol make it both basic and nucleophilic. Protonation of an alcohol converts hydroxide, a poor leaving group, into water—a good one. The two acid–base equilibria corresponding to ethanol are depicted below.
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Alcohols are organic compounds in which a hydroxy group is attached to a saturated carbon. Phenols are a class of alcohols containing a hydroxy group attached to an aromatic ring. The physical properties of the alcohols and phenols are influenced by hydrogen bonding due to the oxygen–hydrogen dipole in the hydroxy functional group and dispersion forces between alkyl or aryl regions of alcohol and phenol molecules.
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Depressant drugs, including alcohol and sedative-hypnotics, diminish central nervous system activity by enhancing the action of gamma-aminobutyric acid (GABA), a neurotransmitter that reduces brain activity and promotes relaxation. These substances can have various therapeutic uses but also pose significant risks, especially when misused or combined.
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Related Experiment Video

Updated: Jun 28, 2025

Assessment of Glutamine as a Fuel Source for Alveolar Macrophages Exposed to Chronic Ethanol Using an Extracellular Flux Bioanalyzer
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The Alcohol Harm Paradox in Periodontitis.

L M Oliveira1,2, F B Zanatta1,2, S A Costa3

  • 1Department of Stomatology, Postgraduate Program in Dentistry, Santa Maria, Rio Grande do Sul, Brazil.

Journal of Dental Research
|April 12, 2024
PubMed
Summary

Heavy alcohol consumption disproportionately increases periodontitis risk in individuals with lower socioeconomic position (SEP), highlighting the alcohol harm paradox. This interaction, not mediation, explains the link between SEP and poor oral health.

Keywords:
alcohol drinkingepidemiologyhealth inequalitiesmediation analysisoral healthsocioeconomic factors

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Area of Science:

  • Public Health
  • Dental Research
  • Socioeconomic Determinants of Health

Background:

  • Lower socioeconomic position (SEP) individuals face higher alcohol-related harms despite similar or lower consumption.
  • The alcohol harm paradox (AHP) describes this disparity, with limited understanding of underlying mechanisms.
  • Both SEP and alcohol consumption are linked to periodontitis risk.

Purpose of the Study:

  • To investigate if socioeconomic position modifies the association between alcohol consumption and periodontitis.
  • To determine the extent to which alcohol consumption mediates or interacts with SEP inequalities in periodontitis.

Main Methods:

  • Secondary analysis of National Health and Nutrition Examination Survey (NHANES) 2011-2014 data.
  • Educational attainment as the primary SEP proxy; poverty-income ratio used in sensitivity analyses.
  • Effect measure modification and causal mediation analyses using logistic regression, adjusted for multiple covariates.

Main Results:

  • Less educated heavy drinkers showed significantly higher odds of periodontitis (OR 2.75).
  • Super-additive associations indicated a significant interaction between heavy drinking and lower education on periodontitis.
  • Interaction, not mediation, explained a substantial portion (-69.5%) of the effect of education on periodontitis, supporting the AHP.

Conclusions:

  • Heavy alcohol consumption disproportionately exacerbates periodontitis risk among lower socioeconomic position individuals.
  • The alcohol harm paradox in periodontitis is driven by a significant interaction effect between heavy drinking and lower SEP.
  • Findings underscore the need for targeted public health interventions addressing socioeconomic disparities in alcohol-related oral health outcomes.