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Effect of ethanol feeding on bone composition in the rat
The American Journal of Clinical Nutrition
|January 1, 1979
Summary
Ethanol consumption over three months did not alter bone density or key mineral and collagen levels in rats. However, mild osteomalacia was indicated by reduced bone mineral content and altered calcium-to-hydroxyproline ratios.
Area of Science:
- Bone metabolism
- Toxicology
- Nutritional science
Background:
- Ethanol consumption is widespread and may affect skeletal health.
- Understanding ethanol's impact on bone is crucial for public health.
- Previous studies have shown mixed results on ethanol's skeletal effects.
Purpose of the Study:
- To investigate the effects of chronic ethanol feeding on bone mineral and collagen content in rats.
- To assess serum mineral and vitamin D levels following ethanol exposure.
- To evaluate markers of bone turnover in response to ethanol intake.
Main Methods:
- Rats were fed ethanol for three months.
- Bone mineral density, calcium, phosphorus, hydroxyproline, and nitrogen content in tibiae were measured.
- Serum calcium, phosphorus, and 25-hydroxyvitamin D were analyzed.
- Urinary glycosaminoglycans and hydroxyproline excretion were quantified.
Main Results:
- Ethanol feeding did not change tibial density, calcium, phosphorus, hydroxyproline, or nitrogen concentrations.
- Serum calcium, phosphorus, and 25-hydroxyvitamin D remained unaffected.
- A decrease in EDTA-extractable mineral content and the calcium/hydroxyproline ratio suggested mild osteomalacia.
- Urinary hydroxyproline excretion increased, but urinary glycosaminoglycans were unchanged.
Conclusions:
- Three months of ethanol feeding caused minimal bone changes in rats, not fully explaining increased urinary hydroxyproline.
- The observed changes suggest a mild osteomalacia, indicating potential subtle skeletal effects of ethanol.
- Further research is needed to elucidate the mechanisms behind ethanol-induced bone alterations.