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Vitamin C status and respiratory function

A R Ness1, K T Khaw, S Bingham

  • 1Institute of Public Health, University Forvie Site, Robinson Way, Cambridge.

European Journal of Clinical Nutrition
|September 1, 1996
PubMed
Summary
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Higher plasma vitamin C levels were linked to better lung function in men, suggesting vitamin C may protect respiratory health across normal dietary ranges.

Area of Science:

  • Pulmonary Medicine
  • Nutritional Science
  • Epidemiology

Background:

  • Respiratory function is crucial for overall health.
  • Vitamin C is a key antioxidant with potential roles in lung health.
  • Previous research suggests a link between vitamin C and respiratory outcomes.

Purpose of the Study:

  • To investigate the cross-sectional association between plasma vitamin C levels and respiratory function.
  • To determine if this relationship differs between men and women.

Main Methods:

  • Cross-sectional, population-based study of 835 men and 1025 women aged 45-75.
  • Data collected via health and lifestyle questionnaires and health checks.
  • Respiratory function assessed by forced expiratory volume in one second (FEV1) and forced vital capacity (FVC); plasma vitamin C measured.

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Main Results:

  • Plasma vitamin C showed a positive correlation with FEV1 (r=0.17) and FVC (r=0.14) in men, which remained significant after adjustments.
  • The association between vitamin C and lung function was weaker and not statistically significant in women.
  • A 50 micromol/L increase in vitamin C was associated with a 0.22 L increase in FEV1 and 0.23 L in FVC in men.

Conclusions:

  • Findings support vitamin C's potential protective role in maintaining lung function.
  • The association suggests benefits across the normal range of vitamin C intake.
  • Further research could explore causal mechanisms and intervention strategies.