Antoninov Posté 20 janvier 2005 Signaler Posté 20 janvier 2005 Texas lawmaker seeks to put body mass index on students' report cardsTuesday, January 18, 2005 Texas school districts would be required to include the body mass index of students as part of their regular report cards under a bill introduced Tuesday by a lawmaker seeking to link healthy minds with healthy bodies. When the measurement, which calculates body fat based on height and weight, indicates a student is overweight, the school would provide parents with information about links between increased body fat and health problems, said Democratic state Sen. Leticia Van de Putte. "We should be just as concerned with students' physical health and performance as we are with their academic performance," she said. More than a third of school-age children in Texas are overweight or obese, according to the Texas Department of Agriculture. Arkansas implemented a similar law during the 2003-2004 school year, although the information is sent to parents separately from report cards. (…)
Invité Fran Posté 20 janvier 2005 Signaler Posté 20 janvier 2005 Van de Putte elle merite bien son nom mais malgre son prenom (laetitia = la joyeuse) c'est pas la joie
Patrick Smets Posté 20 janvier 2005 Signaler Posté 20 janvier 2005 Avec leur battage médiatique, ils n'arretent pas de dire 25 = ok. EN entendant ça, moi, j'ai repris deux fois du dessert. Mais le site-là est quand même bcp plus sévère. http://www.chez.com/chocolat/amour/imcjava.htm
Punu Posté 20 janvier 2005 Signaler Posté 20 janvier 2005 Ca me fait penser à une dépêche récente : Le régime de l'araignée (et de ses amis)Dans le cadre d'une recherche internationale (Grande-Bretagne, Danemark, Nouvelle-Zélande et Israël) menée par David Mayntz de l'Université d'Oxford, trois variétés d'arachnides et d'insectes - des araignées-loup, des araignées tisseuses de toiles et des scarabées -, se sont vus offrir des nourritures déséquilibrées, trop riches en lipides ou en protéines. Les chercheurs leur ont ensuite proposé des aliments plus variés et tous les animaux ont choisi ceux permettant de restaurer l'équilibre des protéines et des graisses. «Cette étude nous donne une toute nouvelle image des scarabées et des araignées prédateurs à savoir celle d'animaux faisant très attention à ce qu'ils mangent. Notre étude est la première à montrer de façon expérimentale qu'un animal carnivore est capable de compenser les déséquilibres nutritifs en sélectionnant les types d'aliments qu'il consomme», a déclaré David Mayntz. Les résultats de cette étude sont parus dans la revue Science datée du 7 janvier et pourraient s'étendre à d'autres carnivores comme le léopard ou le requin. *** Spiders Watch Their Diets Too, Study Says James Owen in London for National Geographic News January 6, 2005 Spiders and insects that eat other creepy crawlies purposely seek a balanced diet to maintain their health, according to a new study. Scientists found that three predatory invertebrates—all of which use different hunting methods—adjust their feeding to correct nutritional deficiencies. Researchers behind the study—to be published tomorrow in the journal Science —say other, much larger predators, like leopards and sharks, may also monitor what they eat to maintain a balanced diet. While it's known that plant eaters and omnivores often eat a wide selection of foods to ensure the intake of various nutrients, carnivores aren't thought to be that fussy. Yet the study showed that predators also "read the label" when selecting their prey. Scientists based in England, Denmark, New Zealand, and Israel tested a quick ground beetle, an ambushing wolf spider, and a web-building desert spider to see if they selectively forage for fat (lipids) and protein. The animals were first given an unbalanced diet, skewed in favor of either lipids or protein. Their subsequent feeding, after they were given a choice of foods, was then monitored. Previously fed a lipid-rich diet, ground beetles (Agonum dorsale) subsequently ate protein-enriched food to compensate for the imbalance. The reverse happened when they were initially fed protein-laden food. It was a similar story for the wolf spider (Pardosa prativaga), according to co-author David Mayntz, a zoologist at Oxford University, England. He said, "Wolf spiders don't build webs but sit and wait for prey to appear and then ambush them, so we didn't think they would be able to go out and select their diet. They have to deal with whatever they catch. But we found what they eat from the prey they do catch will depend on how much protein is in the prey and what [the predator's] last meal was. If they had a lipid-rich meal the day before, then the next day they would eat more prey containing lots of protein." Desert Spider The web-building desert spider (Stegodyphus lineatus) has even less control over the type of prey it eats, Mayntz says. "It cannot do anything to attract specific animals with specific nutrients," Mayntz said. "It has to deal with whatever ends up in the web." Yet the study team discovered that the desert spider is able to extract nutrients selectively from a single fruit fly, depending on the spider's previous meals. It's unclear how desert spiders manage this, though the researchers suspect it's to do with enzymes the spider pumps into its prey to digest its insides. "The spiders let the enzymes work for a while, then suck up the half-digested juice," Mayntz said. "Apparently they are able to take more protein out via the enzymes if the last prey they ate was poor in protein." Possible mechanisms that allow insects and other invertebrates to alter their feeding according to nutritional need have been identified by two of Mayntz's colleagues at Oxford University's zoology department, Stephen J. Simpson and David Raubenheimer. Working with plant-eating locusts, they identified a novel "taste-feedback" mechanism, whereby levels of nutrients in the blood indicate a locust's nutritional state, giving it a taste for the type of food it needs most. Simpson said: "This provides direct, nutrient-specific control over food selection and consumption and allows insects to make sophisticated nutritional decisions without requiring complex neural integration." Food Odors The locusts were also shown to associate certain smells with beneficial foods. Simpson says they were specifically attracted by odors previously associated with foods containing nutrients the insect was deficient in—even after only a few hours of deficiency. For predatory bugs, Mayntz says different food will also have different nutritional values. "Some prey can have as much fat as a sausage, while another will be more like a lean steak," he said. Mealworms, for instance, contain high amounts of lipids. "If protein is needed, a predator might go for something like a mosquito, which has a huge amount of muscle compared with body lipids," Mayntz added. "Mosquitoes also suck up blood, which is full of protein." Some larger predators have also been shown to be choosy about what they eat. For instance, experiments with carnivorous fish reveal they are able to compose diets based on nutritional value. Biologists at the University of Murcia in Spain found that rainbow trout, when offered a range of foods, went for the high-protein option, while cutting out fats and carbohydrates. And it's possible that much bigger carnivores, such as leopards and sharks, show similar feeding behavior. Mayntz says leopards might get particular nutrients by concentrating on certain parts of a carcass. "If they can't eat a whole antelope at once, perhaps they will start eating the bits they need most and then try to hide the rest," he said. Indeed, Mayntz and his colleagues intend to move up the food chain in their investigation of predators' eating habits, starting with mink and cats. Who knows? Maybe even great white sharks consult their diet sheets when deciding what next to sink their teeth into.
Taisei Yokusankai Posté 20 janvier 2005 Signaler Posté 20 janvier 2005 Avec leur battage médiatique, ils n'arretent pas de dire 25 = ok. EN entendant ça, moi, j'ai repris deux fois du dessert. Mais le site-là est quand même bcp plus sévère.http://www.chez.com/chocolat/amour/imcjava.htm <{POST_SNAPBACK}> Avec ce truc, je fais 25.1, ce qui me mets dans la catégorie "gros surpoids". Tu reconnaitras, m'ayant rencontré, que c'est un peu tiré par les cheveux. Par contre en prenant l'échelle vue hier sur la RTB, ça donne "léger surpoids" et( là c'est tout à fait vrai. (Ca va pas s'améliorer avec les bières de samedi d'ailleurs :icon_mrgreen: )
Patrick Smets Posté 20 janvier 2005 Signaler Posté 20 janvier 2005 Et moi, pour devenir 'homme standard", je dois perdre qqch comme 10 kg. C'est pas "homme standard", ca, c'est "apollon"….
Antoninov Posté 20 janvier 2005 Auteur Signaler Posté 20 janvier 2005 Notre étude est la première à montrer de façon expérimentale qu'un animal carnivore est capable de compenser les déséquilibres nutritifs en sélectionnant les types d'aliments qu'il consomme», a déclaré David Mayntz. Les résultats de cette étude sont parus dans la revue Science datée du 7 janvier et pourraient s'étendre à d'autres carnivores comme le léopard ou le requin. Reste à leur faire comprendre que ça peut s'étendre à l'homme?
Patrick Smets Posté 20 janvier 2005 Signaler Posté 20 janvier 2005 Le lien donne le BMI féminin, non ? <{POST_SNAPBACK}> Les deux, non ?
melodius Posté 20 janvier 2005 Signaler Posté 20 janvier 2005 Il semblerait que oui mais il s'interpréterait différemment pour les hommes et les femmes. Ce lien ci est plus clair et il n'y a pas tous les pop-ups chiants: http://nhlbisupport.com/bmi/bmi-m.htm (faut choisir le métrique évidemment…)
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