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Les antioxydants

  • Par : Pharmapresse

  • Tags :

L'oxydation est une  réaction d'oxydoréduction qui transfère des électrons d'une substance vers un agent oxydant. Cette réaction peut produire des radicaux qui entraînent des réactions en chaîne destructrices. L’antioxydant est une molécule qui diminue ou empêche cette oxydation.

Les antioxydants permettent de protéger notre organisme contre les radicaux libres et ainsi, ils permettent la prévention de nombreuses maladies.

Déficit en antioxydants :

Un déséquilibre de nos défenses anti-radicalaires peut-être lié à un manque d’antioxydants dans notre alimentation. En particulier, la cuisson trop forte et la conservation des aliments détruisent un grand nombre d’antioxydants.

Certains facteurs vont exagérer les phénomènes d’oxydation :

  • Tabac
  • Alcool
  • Médicaments
  • Pollution
  • Radiations électromagnétiques
  • Maladies inflammatoires et infectieuses
  • Surmenage physique et intellectuel,
  • Stress,

Maladies liées à l’excès d’oxydation :

  • Cancer
  • Maladies cardiovasculaires
  • Dégénérescence maculaire liée à l’âge (DMLA)
  • Complications du diabète
  • Maladies liées à l’inflammation chronique

Où trouve-t-on les antioxydants ?

  • Vitamine C : poivron, goyave, oseille, citron, orange, kiwi, choux, papaye, fraises…
  • Vitamine E : huile de tournesol, de soja, de maïs, beurre, margarine, oeufs…
  • Vitamine A : foie, beurre, oeufs…
  • Sélénium : Poissons, oeufs, viandes…
  • Zinc : fruits de mer, viandes, pain complet, légumes verts ;
  • Polyphénols (flavonoïdes et tanins en particulier) : fruits et légumes, vin, thé…

Il est recommandé de consommer entre 3000 et 5000 unités ORAC par jour (Oxygen Radical Absorbance Capacity)