Pourquoi il ne vaut mieux pas consommer trop d'algues ?

10 Août, 2018, 08:06 | Auteur: Yves Courtet
  • Un homme récolte des algues à Trégunc le 12 avril 2017

Certaines espèces d'algues doivent attirer l'attention plus que d'autres, compte tenu de leur forte teneur en iode. Mais comme le rappelle l'Anses, leur consommation peut provoquer des excès en iode dangereux pour le cœur, les reins et la thyroïde. Idem concernant les compléments alimentaires. Par conséquent, certaines personnes à risque doivent éviter de consommer des produits à base d'algues, notamment celles qui présentent un dysfonctionnement thyroïdien, une maladie cardiaque ou une insuffisance rénale, les personnes qui suivent déjà un traitement médicamenteux contenant de l'iode ou du lithium, et enfin, les futures mamans ou les femmes qui allaitent leur bébé, hors avis médical.

Mais pour quelles raisons? Mais gare au risque d'excès d'apports en iode, avertit l'agence de sécurité sanitaire Anses.

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Quelles algues sont concernées? L'Anses s'adresse donc également aux autorités afin que la teneur en iode dans les produits à base d'algues soit clairement indiquée sur les emballages ou dans les commerces, seul moyen pour les consommateurs de connaître les quantités qu'ils ingèrent chaque jour. C'est le cas des algues brunes laminaires Laminaria spp et Saccharina spp, ainsi que l'algue rouge Gracilaria verruqueuse, spécifie l'Anses. En France, la réglementation fixe à 150 µg cette dose maximale quotidienne dans les compléments alimentaires. Or, de plus en plus de produits contiennent des algues, plus ou moins fortement dosées. Mais à cause de la teneur en iode - souvent très élevée - de ces compléments, ces consommateurs présentent "un risque important de dépassement des limites supérieures de sécurité" (600 microgrammes par jour pour l'adulte), selon l'agence sanitaire. Elle recommande une consommation prudente des enfants, " les données étant insuffisantes pour mesurer le risque encouru ".

Ils sont particulièrement consommés par les végétaliens, pour compenser leurs carences en iode.

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