Metal ions affecting the gastrointestinal system including the liver

Area of Science:

• Toxicology
• Nutritional Science
• Environmental Health

Background:

• Metal ions are essential or hazardous, with dietary metals posing complex toxicity risks.
• Mineral supplements are often perceived as safe, yet evidence suggests potential health hazards.
• Limited studies exist on the toxicity of common dietary metals and their long-term effects.

Purpose of the Study:

• To review current methods for assessing metal ion toxicity from ingestion.
• To highlight data gaps and uncertainties in metal toxicity risk assessment.
• To emphasize the need for further research on metal associations with chronic diseases and aging.

Main Methods:

• Review of existing risk assessment approaches for ingested metal ions.
• Analysis of data limitations and uncertainties in human risk extrapolation.
• Examination of toxicological data from metal homeostasis disorders and overload.

Main Results:

• Current risk assessment methods like oral reference dose and Target Hazard Quotient have limitations.
• Data for assessing metal toxicity in healthy populations and chronic disease patients is often insufficient.
• Mechanisms of metal toxicity, such as oxidative stress, are known but direct extrapolation to humans is challenging.

Conclusions:

• The diverse effects of metals and lack of comprehensive studies necessitate further research.
• In-depth investigation is required for metal ion associations with aging, chronic inflammatory diseases, and cancer.
• Understanding metal toxicity is crucial for public health, especially concerning dietary supplements.