{"id":192343,"date":"2026-08-24T12:10:16","date_gmt":"2026-08-24T10:10:16","guid":{"rendered":"https:\/\/newmobility.news\/?p=192343"},"modified":"2026-08-24T12:02:09","modified_gmt":"2026-08-24T10:02:09","slug":"higher-co2-levels-make-food-more-calorie-dense-but-not-more-nutritious","status":"publish","type":"post","link":"https:\/\/newmobility.news\/fr\/2026\/08\/24\/higher-co2-levels-make-food-more-calorie-dense-but-not-more-nutritious\/","title":{"rendered":"Des niveaux de CO\u2082 plus \u00e9lev\u00e9s augmentent la densit\u00e9 calorique des aliments, mais ne les rendent pas plus nutritifs"},"content":{"rendered":"

Des scientifiques de l'universit\u00e9 de Leyde ont mis en \u00e9vidence que les plantes poussent plus vite en raison d'une augmentation de\u00a0CO\u2082.\u00a0<\/span>Le revers de la m\u00e9daille, c'est qu'ils deviennent plus caloriques mais moins nutritifs. <\/span>La valeur nutritionnelle de la quasi-totalit\u00e9 des cultures a diminu\u00e9 \u2013 les plantes<\/span> contiennent moins de prot\u00e9ines, de fer et d'autres nutriments.\u00a0<\/span><\/p>\n

L'\u00e9tude de Leyde a regroup\u00e9 des milliers d'observations portant sur des dizaines de cultures et de nutriments. Sa conclusion g\u00e9n\u00e9rale est que des concentrations \u00e9lev\u00e9es de CO\u2082 ont tendance \u00e0 modifier la composition des plantes en augmentant leur teneur en carbone et en glucides, tout en r\u00e9duisant les concentrations de plusieurs min\u00e9raux essentiels et, souvent, de prot\u00e9ines.<\/p>\n

Effet de dilution<\/h4>\n

On soup\u00e7onnait d\u00e9j\u00e0 que notre alimentation \u00e9tait moins nutritive qu'auparavant. Les scientifiques de Leyde viennent toutefois de le confirmer \u00e0 l'issue de recherches approfondies : les plantes poussent plus vite en raison de l'augmentation du CO\u2082, mais cet exc\u00e8s de carbone les am\u00e8ne \u00e0 produire davantage de glucides \u2013 et donc \u00e0 contenir plus de calories. Par cons\u00e9quent, le changement climatique rend notre alimentation moins nutritive mais plus riche en \u00e9nergie.<\/span><\/p>\n

L'explication courante \u2014 \u201c la plante grandit, ce qui fait que les m\u00eames min\u00e9raux sont dilu\u00e9s dans une biomasse plus importante \u201d \u2014 est en partie correcte, mais incompl\u00e8te. Une concentration plus \u00e9lev\u00e9e en CO\u2082 rend la photosynth\u00e8se plus efficace ; les plantes capturent davantage de carbone et produisent plus de sucres, d\u2019amidon et d\u2019autres glucides. Le carbone augmente donc plus rapidement que les nutriments tels que le fer, le zinc et l\u2019azote, ce qui cr\u00e9e un effet de dilution.<\/p>\n

Carence en fer<\/h4>\n

Ces diff\u00e9rences sont imperceptibles et souvent ind\u00e9tectables au go\u00fbt. Pourtant, pour les personnes d\u00e9j\u00e0 au bord de la malnutrition et qui d\u00e9pendent de quelques aliments de base, comme le riz ou le bl\u00e9, cette baisse de la valeur nutritionnelle peut faire une diff\u00e9rence consid\u00e9rable.<\/span><\/p>\n

Selon l'Organisation mondiale de la sant\u00e9 (OMS), 40% de jeunes enfants et 37% de femmes enceintes dans le monde souffrent d'an\u00e9mie, souvent due \u00e0 une carence en fer. Dans les cas les plus graves, cette carence en fer nuit au d\u00e9veloppement cognitif des enfants. <\/span><\/p>\n

Quantit\u00e9 ou qualit\u00e9 ?<\/h4>\n

Selon les chercheurs, la valeur nutritionnelle a longtemps \u00e9t\u00e9 n\u00e9glig\u00e9e. L'accent \u00e9tait mis sur le rendement,\u00a0<\/span>notamment pour le riz, le ma\u00efs et le bl\u00e9. C'est toujours le cas aujourd'hui.\u00a0<\/span>Cependant, en raison de la s\u00e9cheresse et de l'\u00e9volution des r\u00e9gimes pluviom\u00e9triques, les r\u00e9coltes sont mauvaises, voire impossibles dans certaines r\u00e9gions. Si la valeur nutritionnelle des aliments diminue \u00e9galement, cela a des cons\u00e9quences sur notre sant\u00e9.\u00a0<\/span><\/p>\n

Il ne s'agit pas non plus uniquement de la quantit\u00e9 de l\u00e9gumes que nous consommons. La qualit\u00e9 des c\u00e9r\u00e9ales influe \u00e9galement sur la valeur nutritionnelle des p\u00e2tes, et un soja moins nutritif signifie que le b\u00e9tail re\u00e7oit moins de nutriments. Cela a une incidence sur la qualit\u00e9 de la viande \u2014 et, par la m\u00eame occasion, sur celle des substituts de viande contenant du soja.<\/span><\/p>\n

Des repas plus vari\u00e9s<\/h4>\n

Quoi qu\u2019il en soit, les scientifiques estiment que le simple fait de consommer davantage des cultures actuelles ne r\u00e9soudra pas le probl\u00e8me. \u201c La teneur en calories augmente par rapport \u00e0 la teneur en nutriments, et la plupart des gens consomment d\u00e9j\u00e0 trop de calories. Avant tout, nous devons diversifier notre alimentation. \u201d<\/span><\/p>\n

Une solution possible consisterait \u00e0 \u2018 am\u00e9liorer \u2019 certaines cultures, en utilisant des semences s\u00e9lectionn\u00e9es ou en apportant des nutriments au sol ou directement aux plantes par pulv\u00e9risation. Cependant, la meilleure solution pourrait bien \u00eatre de r\u00e9duire les \u00e9missions de CO\u2082 afin d\u2019\u00e9viter une nouvelle d\u00e9gradation de la qualit\u00e9 des aliments.<\/span><\/p>\n

Et qu'en est-il des prix des denr\u00e9es alimentaires ?<\/span><\/h4>\n

La dilution des nutriments provoqu\u00e9e par le CO\u2082 ne rend pas n\u00e9cessairement le bl\u00e9 ou le riz plus chers au kilogramme. Gr\u00e2ce \u00e0 l\u2019effet traditionnel de fertilisation par le CO\u2082, les agriculteurs pourraient produire davantage de tonnes de bl\u00e9 \u00e0 un co\u00fbt identique, voire inf\u00e9rieur. Mais ces tonnes contiendraient moins de nutriments. Et t<\/span>Le prix par calorie et le prix par nutriment pourraient diverger.<\/p>\n

Pour les populations les plus d\u00e9munies, qui d\u00e9pendent fortement du riz, du bl\u00e9 ou du ma\u00efs, les cons\u00e9quences pourraient \u00eatre bien plus graves. Il est possible de consommer suffisamment de calories tout en souffrant de carences en micronutriments. L'agriculture pourrait compenser en partie la baisse de la densit\u00e9 nutritionnelle, mais ces mesures ont un co\u00fbt.<\/p>\n

En conclusion : le changement climatique pourrait entra\u00eener une hausse du co\u00fbt de l'alimentation, m\u00eame si les exploitations agricoles produisent davantage de calories. En Belgique et aux Pays-Bas, une augmentation des \u00e9missions de CO\u2082 pourrait se traduire par des rendements plus \u00e9lev\u00e9s pour certaines cultures, mais avec une teneur en nutriments par kilogramme plus faible.<\/p>\n

En cons\u00e9quence, l'intensification de la s\u00e9lection, de la fertilisation et des contr\u00f4les de qualit\u00e9 entra\u00eenerait une hausse des co\u00fbts de production. Ainsi, une partie du prix des denr\u00e9es alimentaires de demain pourrait correspondre au prix que la soci\u00e9t\u00e9 paie pour pr\u00e9server la qualit\u00e9 nutritionnelle d'aujourd'hui.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/span><\/p>","protected":false},"excerpt":{"rendered":"

Scientists at Leiden University have found evidence that plants grow faster due to increased\u00a0CO2.\u00a0The flip side is that they become higher in calories but less nutritious. The nutritional value of virtually all crops has declined \u2013 plants contain less protein, iron, and other nutrients.\u00a0 The Leiden study pooled thousands of observations across dozens of crops […]<\/p>\n","protected":false},"author":175,"featured_media":192374,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"{title}\r\n\r\n{excerpt}\r\n\r\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[29,51851,77201,4],"tags":[],"class_list":["post-192343","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environment","category-health","category-study","category-top-stories-today"],"acf":[],"featured_image_urls_v2":{"full":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?fit=967%2C640&ssl=1",967,640,false],"thumbnail":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=150%2C150&ssl=1",150,150,true],"medium":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?fit=300%2C199&ssl=1",300,199,true],"medium_large":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?fit=640%2C424&ssl=1",640,424,true],"large":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?fit=640%2C424&ssl=1",640,424,true],"1536x1536":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?fit=967%2C640&ssl=1",967,640,true],"2048x2048":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?fit=967%2C640&ssl=1",967,640,true],"trp-custom-language-flag":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?fit=18%2C12&ssl=1",18,12,true],"related-thumb":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=640%2C480&ssl=1",640,480,true],"gform-image-choice-sm":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=300%2C300&ssl=1",300,300,true],"gform-image-choice-md":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=400%2C400&ssl=1",400,400,true],"gform-image-choice-lg":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=600%2C600&ssl=1",600,600,true],"mailchimp":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?fit=560%2C371&ssl=1",560,371,true],"unipress-phone":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=640%2C100&ssl=1",640,100,true],"unipress-tablet":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=967%2C240&ssl=1",967,240,true],"unipress-tablet-portrait":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=967%2C180&ssl=1",967,180,true],"unipress-tablet-landscape":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=967%2C180&ssl=1",967,180,true],"unipress-smartphone":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=967%2C168&ssl=1",967,168,true],"unipress-wide-screen":["https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?resize=967%2C180&ssl=1",967,180,true]},"post_excerpt_stackable_v2":"

Scientists at Leiden University have found evidence that plants grow faster due to increased\u00a0CO2.\u00a0The flip side is that they become higher in calories but less nutritious. The nutritional value of virtually all crops has declined \u2013 plants contain less protein, iron, and other nutrients.\u00a0 The Leiden study pooled thousands of observations across dozens of crops and nutrients. Its overall conclusion is that elevated CO\u2082 tends to shift plant composition toward greater carbon and carbohydrate content, while reducing concentrations of several essential minerals and often protein. Dilution effect It was already suspected that our food was less nutritious than it had…<\/p>\n","category_list_v2":"Environment<\/a>, Health<\/a>, Study<\/a>, Top Stories Today<\/a>","author_info_v2":{"name":"Hilde Van Raemdonck","url":"https:\/\/newmobility.news\/fr\/author\/hilde-van-raemdonck\/"},"comments_num_v2":"0 comments","yoast_head":"\nHigher CO2 levels make food more calorie-dense but not more nutritious - newmobility.news<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/newmobility.news\/fr\/2026\/08\/24\/higher-co2-levels-make-food-more-calorie-dense-but-not-more-nutritious\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Higher CO2 levels make food more calorie-dense but not more nutritious - newmobility.news\" \/>\n<meta property=\"og:description\" content=\"Scientists at Leiden University have found evidence that plants grow faster due to increased\u00a0CO2.\u00a0The flip side is that they become higher in calories but less nutritious. The nutritional value of virtually all crops has declined \u2013 plants contain less protein, iron, and other nutrients.\u00a0 The Leiden study pooled thousands of observations across dozens of crops […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/newmobility.news\/fr\/2026\/08\/24\/higher-co2-levels-make-food-more-calorie-dense-but-not-more-nutritious\/\" \/>\n<meta property=\"og:site_name\" content=\"newmobility.news\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/search\/top\/?q=newmobility.news\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-24T10:10:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/i0.wp.com\/newmobility.news\/wp-content\/uploads\/2026\/08\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?fit=967%2C640&ssl=1\" \/>\n\t<meta property=\"og:image:width\" content=\"967\" \/>\n\t<meta property=\"og:image:height\" content=\"640\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Hilde Van Raemdonck\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@jorisvry\" \/>\n<meta name=\"twitter:site\" content=\"@jorisvry\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Hilde Van Raemdonck\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture est.\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/newmobility.news\\\/2026\\\/08\\\/24\\\/higher-co2-levels-make-food-more-calorie-dense-but-not-more-nutritious\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/newmobility.news\\\/2026\\\/08\\\/24\\\/higher-co2-levels-make-food-more-calorie-dense-but-not-more-nutritious\\\/\"},\"author\":{\"name\":\"Hilde Van Raemdonck\",\"@id\":\"https:\\\/\\\/newmobility.news\\\/#\\\/schema\\\/person\\\/7540fd72a981bf6a315ba1b874c2a464\"},\"headline\":\"Higher CO2 levels make food more calorie-dense but not more nutritious\",\"datePublished\":\"2026-08-24T10:10:16+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/newmobility.news\\\/2026\\\/08\\\/24\\\/higher-co2-levels-make-food-more-calorie-dense-but-not-more-nutritious\\\/\"},\"wordCount\":684,\"publisher\":{\"@id\":\"https:\\\/\\\/newmobility.news\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/newmobility.news\\\/2026\\\/08\\\/24\\\/higher-co2-levels-make-food-more-calorie-dense-but-not-more-nutritious\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/i0.wp.com\\\/newmobility.news\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/Scherm%C2%ADafbeelding-2026-08-24-om-11.27.23.png?fit=967%2C640&ssl=1\",\"articleSection\":[\"Environment\",\"Health\",\"Study\",\"Top Stories Today\"],\"inLanguage\":\"fr-BE\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/newmobility.news\\\/2026\\\/08\\\/24\\\/higher-co2-levels-make-food-more-calorie-dense-but-not-more-nutritious\\\/\",\"url\":\"https:\\\/\\\/newmobility.news\\\/2026\\\/08\\\/24\\\/higher-co2-levels-make-food-more-calorie-dense-but-not-more-nutritious\\\/\",\"name\":\"Higher CO2 levels make food more calorie-dense but not more nutritious - 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