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Mangel på sol kan øke vekten om vinteren

- av flere grunner

Mangel på sol kan øke vekten om vinterenIfølge en ny oppdagelse ved Alberta University i Canada, kan mangel på sol bidra til den vektøkningen mange opplever i vintermånedene.
Dette skyldes at våre fettceller er følsomme overfor sol. Mangelen på sol kan også resultere i dårlig søvn og mangel på vitamin D, som har forskjellige funksjoner i forbindelse med stoffskiftet.

Solen og de andre stjernene avgir lys i forskjellige farger, det kalles for bølgelengder. Jo kortere bølgelengden er, desto mere blått er lyset, og jo lengre bølgelengden er, desto rødere er lyset. Gul er midt imellom, og regnbuen viser tydelig skiftet mellom bølgelengdene og alle fargene. Noen bølgelengder kan vi ikke se, som for eksempel de korte UV-bølger, og lange radiobølger.

De blå bølgelengdene fører til at fettcellene lagrer mindre fett

Etter hvert som sola kommer høyere på himmelen spreder lyset seg og de blå bølgelengdene blir sterkere, og trenger gjennom overhuden og videre til de underliggende fettcellene. Det gjør at cellenes fettpartikler blir mindre og de frigjøres fra cellene. Ifølge professor Peter Light som står bak studien, betyr det at fettcellene under huden ikke kan lagre like mye fett, når de utsettes for blå bølgelengder.

På de nordlige breddegradene står solen lavt på himmelen, og er mer eller mindre fraværende om vinteren. Mangel på kraftig sollys og blå bølgelengder kan dermed bidra til at man typisk lagrer mer fett om vinteren og kanskje tar på to til tre kilo, selv om kosthold og mosjonsvaner er de samme. Siden tidenes morgen har det sannsynligvis vært hensiktsmessig med en mindre vektøkning for bedre å motstå vinterens kulde. Men det er ikke så praktisk for det moderne mennesket, da mange av oss allerede veier for mye.

Det blå lyset som ny terapi

Ifølge Peter Light er det kun innledende undersøkelser på feltet, og det anbefales naturligvis ikke å overdrive soling, fordi man har et ønske om å gå ned i vekt.
Likevel kan den nye oppdagelsen åpne for nye tanker rundt fremtidig forskning, hvor lysterapi kan bli en del av behandlingstilbudet ved overvekt, og andre relaterte sykdommer som diabetes.
Peter Light mener at de blå bølgelengdene også kan bidra til å påvirke antallet av fettceller vi produserer i barndommen, og som følger oss resten av livet. Både forskning og statistikk viser at kommende generasjoner sannsynligvis vil bli mer overvektige, på tross av det store fokus vi har på kost og trening. Vi har bruk for dette helsebringende lyset.

Hudens biologiske klokke

Forskerne oppdaget dette da de i forsøket med å hjelpe pasienter med type 1 diabetes, undersøkte hvordan genmanipulerte fettceller kunne produsere insulin som respons på lys. Ifølge Peter Light var dette et noe uventet funn, og han antar at hudens fettceller virker som en slags biologisk klokke.
Det har lenge vært kjent at kroppens biologiske klokke kickstartes av de blå bølgelengdene fra morgensolen. Det finns en direkte nerveforbindelse fra øyets netthinne til pinealkjertelen i hjernen, som produserer serotonin i løpet av dagen, slik at vi holder oss friske. Vi trenger derfor mye dagslys. Samtidig signaliserer det avtakende rødaktige kveldslyset og nattemørket at det snart er tid for å sove. Da blir serotonin omdannet til melatonin, som sikrer oss en god natts søvn og god drømmeaktivitet.
Kroppens biologiske klokke er derfor en forutsetning for en sunn døgnrytme, og den nye studien viser at kroppens biologiske klokke har også påvirkes av sommer og vinter, slik at vi kan tilpasse oss så godt som mulig gjennom hele året. Ifølge Peter Light inneholder disse nye observasjonene mange spennende ledetråder for mer forskning på området.
Tre amerikanske forskere fikk i 2017 Nobelprisen i fysiologi, for sin oppdagelse av de molekylære mekanismene som styrer vår døgnrytme.

Ta vare på det blå LED-lyset om natten

Ifølge Peter Light var det fra naturens side ikke meningen at vi skulle bli utsatt for kunstig lys i løpet av kvelden, da det kan påvirke kroppen på samme måte som sollyset, som signaliserer en ny dag. Dette kan være en av grunnene til at vi har vanskelig for å produsere melatonin, som vi trenger for å sovne. Det er spesielt de nye former for lys fra LED-lyspærer, smarttelefoner og skjermer som er problematiske, fordi de har en sterk blåaktig farge. Dette gjør det lett å holde seg våken foran smarttelefonen eller skjermen, med det resultat at vi kommer for sent i seng. Andre undersøkelser viser at for lite søvn også kan bidra til å forstyrre blodsukkeret, og at vi legger på oss mer fett.
Det kan hjelpe på melatoninproduksjonen og søvnen om man på kvelden prioriterer rødt eller gult lys, eller bruker briller som blokkerer det blå lyset. Man kan også vurdere kosttilskudd med melatonin.

Mangel på sol og vitamin D bidrar til vektøkning og fedmeepidemi

Når sommersolen står høyt nok på himmelen, bidrar UV-bølger til at huden danner D-vitamin, som har mange funksjoner i forbindelse med stoffskiftet. Mangel på vitamin D er utbredt, spesielt om vinteren, og mangel forekommer oftere hos overvektige og pasienter med diabetes type 2. En annen studie fra Baylor College of Medicine i Houston, Texas, tyder på at sammenhengen mellom fedme og mangel på D- Vitamin finnes i hjernen, der vitamin D vanligvis bidrar til å regulere vekt og blodsukker.

Kilder:

Katarina Ondrusova et al. Subcutaneus white adipocytes express a light sensitive signalling pathjway mediated via a melanopsin/TRPC channal axis. Scientific Reports 2017
University of Alberta Faculty of Medicine & Dentistry. New discovery may explain winter weight gain
https://www.sciencedaily.com/releases/2018/01/180110113007.htm

http://www.stjernebasen.dk/lysogfarver.htm

http://videnskab.dk/krop-sundhed/elektrisk-lys-og-skaermtid-odelaegger-sovnen-og-skader-helbredet

Hanne Kokkegård. Døgnrytmens mekanik udløser Nobelprisen i fysiologi. Ingeniøren okt. 2017
https://ing.dk/artikel/doegnrytmens-mekanik-udloeser-nobelprisen-fysiologi-206171

Sisley SR et al. Hypothalamic Vitamin D Improves Glucose Homeostasis and Reduces Weight. Diabetes 2016
https://www.ncbi.nlm.nih.gov/pubmed/27217488

Graven, Andreas R. Søvn påvirker vægt og aktivitetsniveau. Videnskab.dk 2014

Pierpaoli Walter, Regelson William. The Melatonin Miracle. Simon and Schuster 1996

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  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `has_categories` AS `s` INNER JOIN `has_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`403μs3.98KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT `m`.`tag_id`,`t`.* FROM `has_contentitem_tag_map` AS `m` INNER JOIN `has_tags` AS `t` ON `m`.`tag_id` = `t`.`id` WHERE `m`.`type_alias` = :contentType AND `m`.`content_item_id` = :id AND `t`.`published` = 1 AND `t`.`access` IN (:preparedArray1,:preparedArray2) AND `language` IN (:preparedArray3,:preparedArray4)4.09ms4.09KBParams/libraries/src/Helper/TagsHelper.php:388Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `has_categories` AS `s` INNER JOIN `has_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`1.13ms3.98KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM has_fields AS a LEFT JOIN `has_languages` AS l ON l.lang_code = a.language LEFT JOIN has_users AS uc ON uc.id=a.checked_out LEFT JOIN has_viewlevels AS ag ON ag.id = a.access LEFT JOIN has_users AS ua ON ua.id = a.created_user_id LEFT JOIN has_fields_groups AS g ON g.id = a.group_id LEFT JOIN `has_fields_categories` AS fc ON fc.field_id = a.id WHERE ( (`a`.`context` = :context AND (`fc`.`category_id` IS NULL OR `fc`.`category_id` IN (:preparedArray1,:preparedArray2,:preparedArray3)) AND `a`.`access` IN (:preparedArray4,:preparedArray5)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray6,:preparedArray7)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform AND `a`.`language` IN (:preparedArray8,:preparedArray9) ORDER BY a.ordering ASC1.7ms4.81KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id142μs1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id75μs1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `m`.`id`,`m`.`title`,`m`.`module`,`m`.`position`,`m`.`content`,`m`.`showtitle`,`m`.`params`,`mm`.`menuid` FROM `has_modules` AS `m` LEFT JOIN `has_modules_menu` AS `mm` ON `mm`.`moduleid` = `m`.`id` LEFT JOIN `has_extensions` AS `e` ON `e`.`element` = `m`.`module` AND `e`.`client_id` = `m`.`client_id` WHERE ( ( (`m`.`published` = 1 AND `e`.`enabled` = 1 AND `m`.`client_id` = :clientId AND `m`.`access` IN (:preparedArray1,:preparedArray2)) AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= :publishUp)) AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= :publishDown)) AND (`mm`.`menuid` = :itemId OR `mm`.`menuid` <= 0) AND `m`.`language` IN (:preparedArray3,:preparedArray4) ORDER BY `m`.`position`,`m`.`ordering`7.53ms98.72KBParams/libraries/src/Cache/Controller/CallbackController.php:51Copy
  • SELECT `a`.`id`,`a`.`title`,`a`.`catid`,`a`.`language`, CASE WHEN CHAR_LENGTH(`a`.`alias`) != 0 THEN CONCAT_WS(':', `a`.`id`, `a`.`alias`) ELSE a.id END AS `slug`, CASE WHEN CHAR_LENGTH(`cc`.`alias`) != 0 THEN CONCAT_WS(':', `cc`.`id`, `cc`.`alias`) ELSE cc.id END AS `catslug` FROM `has_content` AS `a` LEFT JOIN `has_categories` AS `cc` ON `cc`.`id` = `a`.`catid` WHERE `a`.`catid` = :catid AND `a`.`state` = :state AND `a`.`access` IN (:preparedArray1,:preparedArray2) AND (`publish_up` IS NULL OR `publish_up` <= :nowDate1) AND (`publish_down` IS NULL OR `publish_down` >= :nowDate2) AND `a`.`language` IN (:preparedArray3,:preparedArray4) ORDER BY CASE WHEN `a`.`publish_up` IS NULL THEN `a`.`created` ELSE `a`.`publish_up` END DESC1.8ms2.63KBParams/plugins/content/pagenavigation/src/Extension/PageNavigation.php:188Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `has_categories` AS `s` INNER JOIN `has_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`1.31ms3.98KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT custom_data FROM has_extensions WHERE element = 'yootheme' AND folder = 'system' LIMIT 1185μs536B/templates/yootheme/packages/platform-joomla/src/Storage.php:30Copy
  • SELECT `language`,`id` FROM `has_menu` WHERE `home` = '1' AND `published` = 1 AND `client_id` = 01.56ms704B/libraries/src/Language/Multilanguage.php:123Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id146μs1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id2.93ms1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `c2`.`language`,CONCAT_WS(':', `c2`.`id`, `c2`.`alias`) AS `id`,CONCAT_WS(':', `ca`.`id`, `ca`.`alias`) AS `catid` FROM `has_content` AS `c` INNER JOIN `has_associations` AS `a` ON `a`.`id` = `c`.`id` AND `a`.`context` = :context INNER JOIN `has_associations` AS `a2` ON `a`.`key` = `a2`.`key` INNER JOIN `has_content` AS `c2` ON `a2`.`id` = `c2`.`id` INNER JOIN `has_categories` AS `ca` ON `c2`.`catid` = `ca`.`id` AND `ca`.`extension` = :extension2 WHERE `c`.`id` = :id AND c2.access IN (1,5) AND c2.language != 'nb-NO' AND (c2.publish_up IS NULL OR c2.publish_up <= '2025-05-03 16:48:56') AND (c2.publish_down IS NULL OR c2.publish_down >= '2025-05-03 16:48:56') AND c2.state = 15.29ms4.02KBParams/libraries/src/Language/Associations.php:145Copy
  • SELECT `c2`.`language`,`c2`.`id` FROM `has_menu` AS `c` INNER JOIN `has_associations` AS `a` ON `a`.`id` = `c`.`id` AND `a`.`context` = :context INNER JOIN `has_associations` AS `a2` ON `a`.`key` = `a2`.`key` INNER JOIN `has_menu` AS `c2` ON `a2`.`id` = `c2`.`id` WHERE `c`.`id` = :id196μs1.38KBParams/libraries/src/Language/Associations.php:145Copy
  • SELECT `name`,`element` FROM `has_extensions` WHERE `type` = 'plugin' AND `folder` = 'finder' AND `enabled` = 11.44ms640B/administrator/components/com_finder/src/Helper/LanguageHelper.php:135Copy
  • SELECT `title` FROM `has_finder_taxonomy` WHERE `parent_id` = 1 AND `state` = 1 AND `access` IN (1,5)2.54ms584B/administrator/components/com_finder/src/Indexer/Taxonomy.php:314Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM has_fields AS a LEFT JOIN `has_languages` AS l ON l.lang_code = a.language LEFT JOIN has_users AS uc ON uc.id=a.checked_out LEFT JOIN has_viewlevels AS ag ON ag.id = a.access LEFT JOIN has_users AS ua ON ua.id = a.created_user_id LEFT JOIN has_fields_groups AS g ON g.id = a.group_id WHERE ( (`a`.`context` = :context AND `a`.`access` IN (:preparedArray1,:preparedArray2)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray3,:preparedArray4)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform AND `a`.`language` IN (:preparedArray5,:preparedArray6) ORDER BY a.ordering ASC5.93ms4.75KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT `title` FROM `has_finder_taxonomy` WHERE `parent_id` = 1 AND `state` = 1 AND `access` IN (1,5)187μs584B/administrator/components/com_finder/src/Indexer/Taxonomy.php:314Copy
  • SELECT SUM(CASE WHEN `a`.`next_execution` <= :now THEN 1 ELSE 0 END) AS due_count,SUM(CASE WHEN `a`.`locked` IS NULL THEN 0 ELSE 1 END) AS locked_count FROM `has_scheduler_tasks` AS `a` WHERE `a`.`state` = 1153μs1.37KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:466Copy
  • SELECT `session_id` FROM `has_session` WHERE `session_id` = ?157μs1KBParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:291Copy
  • UPDATE `has_session` SET `data` = ? , `time` = ? WHERE `session_id` = ?7.58ms592BParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:318Copy