{"id":107817,"date":"2026-05-31T06:03:19","date_gmt":"2026-05-31T04:03:19","guid":{"rendered":"https:\/\/www.infokuryr.cz\/n\/?p=107817"},"modified":"2026-05-31T06:03:19","modified_gmt":"2026-05-31T04:03:19","slug":"skryta-hrozba-rychleho-hubnuti-proc-prilis-rychla-ztrata-vahy-se-vymsti-vasemu-zdravi","status":"publish","type":"post","link":"https:\/\/www.infokuryr.cz\/n\/2026\/05\/31\/skryta-hrozba-rychleho-hubnuti-proc-prilis-rychla-ztrata-vahy-se-vymsti-vasemu-zdravi\/","title":{"rendered":"Skryt\u00e1 hrozba rychl\u00e9ho hubnut\u00ed: Pro\u010d p\u0159\u00edli\u0161 rychl\u00e1 ztr\u00e1ta v\u00e1hy se vymst\u00ed va\u0161emu zdrav\u00ed"},"content":{"rendered":"
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Rostouc\u00ed po\u010det v\u00fdzkum\u016f zpochyb\u0148uje dlouhodob\u011b za\u017eit\u00fd p\u0159edpoklad, \u017ee rychlej\u0161\u00ed hubnut\u00ed je v\u017edy lep\u0161\u00ed.<\/span><\/strong><\/p>\n

Kdy\u017e lid\u00e9 zhubnou p\u0159\u00edli\u0161 rychle, tedy hubnou v\u00edce ne\u017e 1 kg za t\u00fdden, mohou ne\u00famysln\u011b spustit kask\u00e1du biologick\u00fdch n\u00e1sledk\u016f, kter\u00e9 ohro\u017euj\u00ed dlouhodob\u00e9 metabolick\u00e9 zdrav\u00ed.<\/span><\/p>\n

Podle ned\u00e1vn\u00fdch v\u011bdeck\u00fdch studi\u00ed a desetilet\u00ed klinick\u00e9ho pozorov\u00e1n\u00ed probl\u00e9m nespo\u010d\u00edv\u00e1 v samotn\u00e9m \u00fabytku tuku, ale v tom, jak agresivn\u011b k tomu doch\u00e1z\u00ed.<\/span><\/p>\n

V centru pozornosti tohoto probl\u00e9mu je studie z \u0159\u00edjna 2025 publikov\u00e1na v odborn\u00e9m \u010dasopise\u00a0<\/span>Journal of Clinical Investigation<\/span><\/em>\u00a0, kter\u00e1 zkoumala rodiny se vz\u00e1cn\u00fdm onemocn\u011bn\u00edm zvan\u00fdm \u201efamili\u00e1rn\u00ed parci\u00e1ln\u00ed lipodystrofie\u201c.<\/span><\/p>\n

V\u00fdzkumn\u00edci zjistili, \u017ee kdy\u017e se tukov\u00e1 tk\u00e1\u0148 rozpad\u00e1 p\u0159\u00edli\u0161 rychle, zb\u00fdvaj\u00edc\u00ed tukov\u00e9 bu\u0148ky se st\u00e1vaj\u00ed dysfunk\u010dn\u00edmi, maj\u00ed probl\u00e9m spr\u00e1vn\u011b ukl\u00e1dat lipidy a spou\u0161t\u011bj\u00ed z\u00e1n\u011btliv\u00e9 sign\u00e1ly v cel\u00e9m t\u011ble.<\/span><\/p>\n

Zji\u0161t\u011bn\u00ed nazna\u010duj\u00ed, \u017ee kvalita a funkce zb\u00fdvaj\u00edc\u00ed tukov\u00e9 tk\u00e1n\u011b m\u016f\u017ee b\u00fdt d\u016fle\u017eit\u011bj\u0161\u00ed ne\u017e to, kolik celkov\u00e9ho tuku \u010dlov\u011bk ztrat\u00ed.<\/span><\/p>\n

Biologick\u00e9 n\u00e1sledky prudk\u00fdch diet<\/span><\/h2>\n

Kdy\u017e t\u011blo za\u017e\u00edv\u00e1 p\u0159\u00edsn\u00e9 omezen\u00ed kalori\u00ed \u2013 pokles o 800 kalori\u00ed nebo v\u00edce za den \u2013 reaguje spalov\u00e1n\u00edm v j\u00e1trech ulo\u017een\u00e9ho glykogenu na energii. Ka\u017ed\u00fd gram glykogenu v\u00e1\u017ee p\u0159ibli\u017en\u011b 3 gramy vody, a proto rychl\u00fd po\u010d\u00e1te\u010dn\u00ed \u00fabytek hmotnosti na v\u00e1ze odr\u00e1\u017e\u00ed ztr\u00e1tu vody, nikoli ztr\u00e1tu tuku.<\/span><\/p>\n

Jakmile se \u010dlov\u011bk vr\u00e1t\u00ed k norm\u00e1ln\u00edmu stravov\u00e1n\u00ed, tato masa vody se vr\u00e1t\u00ed stejn\u011b rychle. Hlub\u0161\u00ed probl\u00e9m v\u0161ak spo\u010d\u00edv\u00e1 v tom, jak agresivn\u00ed hubnut\u00ed naru\u0161uje hormon\u00e1ln\u00ed komunika\u010dn\u00ed syst\u00e9my t\u011bla.<\/span><\/p>\n

Kortizol, prim\u00e1rn\u00ed stresov\u00fd hormon, prudce stoup\u00e1 p\u0159i fyziologick\u00e9m stresu z extr\u00e9mn\u00edho kalorick\u00e9ho deficitu. To spou\u0161t\u00ed \u0159et\u011bzovou reakci, kter\u00e1 se rozs\u00e1hle zkoum\u00e1 v metabolick\u00e9 medic\u00edn\u011b: nadbytek kortizolu podporuje leptinovou rezistenci, co\u017e je stav, p\u0159i kter\u00e9m mozek ji\u017e spr\u00e1vn\u011b nereaguje na hormon signalizuj\u00edc\u00ed sytost.<\/span><\/p>\n

P\u0159i leptinov\u00e9 rezistenci se metabolismus sacharid\u016f posouv\u00e1 sm\u011brem k ukl\u00e1d\u00e1n\u00ed tuk\u016f nam\u00edsto spalov\u00e1n\u00ed na energii, co\u017e vede k p\u0159ib\u00fdv\u00e1n\u00ed na v\u00e1ze kolem b\u0159icha a pasu.<\/span><\/p>\n

Co odhalilo 50 let v\u00fdzkumu<\/span><\/h2>\n

Pochopen\u00ed toho, jak stresov\u00e9 hormony interaguj\u00ed s metabolismem tuk\u016f, se dramaticky vyvinulo od 70. let 20. stolet\u00ed, kdy v\u00fdzkumn\u00edci poprv\u00e9 identifikovali\u00a0<\/span>leptin<\/span><\/a>\u00a0a za\u010dali mapovat jeho vztah ke kortizolu.<\/span><\/p>\n

Po cel\u00e1 desetilet\u00ed se medic\u00ednsk\u00e9 rady zam\u011b\u0159ovaly t\u00e9m\u011b\u0159 v\u00fdlu\u010dn\u011b na po\u010d\u00edt\u00e1n\u00ed kalori\u00ed a rychl\u00e9 v\u00fdsledky.<\/span><\/p>\n

Soub\u011b\u017en\u00fd soubor v\u00fdzkum\u016f biologick\u00fdch rytm\u016f a hormon\u00e1ln\u00ed signalizace v\u0161ak od t\u00e9 doby odhalil, \u017ee metabolick\u00e9 syst\u00e9my t\u011bla funguj\u00ed na z\u00e1klad\u011b pe\u010dliv\u011b kalibrovan\u00fdch 24hodinov\u00fdch cykl\u016f.<\/span><\/p>\n

Kortizol p\u0159irozen\u011b dosahuje vrcholu r\u00e1no, aby aktivoval bu\u0148ky na dan\u00fd den, zat\u00edmco leptin vrchol\u00ed kolem p\u016flnoci, aby podpo\u0159il regeneraci b\u011bhem sp\u00e1nku.<\/span><\/p>\n

Kdy\u017e rychl\u00e1 dieta naru\u0161\u00ed tyto rytmy extr\u00e9mn\u00edm omezen\u00edm kalori\u00ed, nedostate\u010dn\u00fdm sp\u00e1nkem nebo chronick\u00fdm stresem, pak komunikace mezi t\u011bmito hormony se naru\u0161\u00ed. V\u00fdsledkem je metabolick\u00e9 prost\u0159ed\u00ed, ve kter\u00e9m se i b\u011b\u017en\u00e9 mno\u017estv\u00ed potravy s v\u011bt\u0161\u00ed pravd\u011bpodobnost\u00ed p\u0159em\u011bn\u00ed na ulo\u017een\u00fd tuk nam\u00edsto vyu\u017eiteln\u00e9 energie.<\/span><\/p>\n

Nov\u00e1 v\u011bda o dysfunkci tukov\u00e9 tk\u00e1n\u011b<\/span><\/h2>\n

Studie JCI z roku 2025 vyu\u017eila pokro\u010dil\u00e9 genetick\u00e9 sekvenov\u00e1n\u00ed ke zkoum\u00e1n\u00ed tukov\u00fdch bun\u011bk na molekul\u00e1rn\u00ed \u00farovni a porovn\u00e1vala zdrav\u00e9 lidi s lidmi trp\u00edc\u00edmi lipodystrofi\u00ed.<\/span><\/p>\n

Zji\u0161t\u011bn\u00ed plat\u00ed pro ka\u017ed\u00e9ho, kdo se pokou\u0161\u00ed o agresivn\u00ed hubnut\u00ed: kdy\u017e tukov\u00e9 bu\u0148ky nemohou spr\u00e1vn\u011b fungovat \u2013 a\u0165 u\u017e proto, \u017ee miz\u00ed p\u0159\u00edli\u0161 rychle, nebo proto, \u017ee jsou p\u0159i obezit\u011b p\u0159et\u00ed\u017een\u00e9 \u2013 n\u00e1sledn\u00e9 \u00fa\u010dinky vypadaj\u00ed pozoruhodn\u011b podobn\u011b.<\/span><\/p>\n

Oba sc\u00e9n\u00e1\u0159e produkuj\u00ed tukov\u00e9 bu\u0148ky, kter\u00e9 maj\u00ed probl\u00e9m bezpe\u010dn\u011b ukl\u00e1dat lipidy, co\u017e zp\u016fsobuje, \u017ee se tyto tuky p\u0159el\u00e9vaj\u00ed do jater a sval\u016f. To je hlavn\u00edm faktorem inzul\u00ednov\u00e9 rezistence a ztu\u010dn\u011bn\u00ed jater.<\/span><\/p>\n

Studie tak\u00e9 zjistila, \u017ee mitochondri\u00e1ln\u00ed funkce v t\u011bchto bu\u0148k\u00e1ch kles\u00e1, co\u017e znamen\u00e1, \u017ee tukov\u00e1 tk\u00e1\u0148 ztr\u00e1c\u00ed schopnost \u00fa\u010dinn\u011b regulovat energii. Auto\u0159i do\u0161li k z\u00e1v\u011bru, \u017ee zachov\u00e1n\u00ed funkce tukov\u00fdch bun\u011bk b\u011bhem hubnut\u00ed je stejn\u011b d\u016fle\u017eit\u00e9 jako sn\u00ed\u017een\u00ed objemu tuku.<\/span><\/p>\n

Bezpe\u010dn\u011bj\u0161\u00ed cesta: V\u011bda o udr\u017eiteln\u00fdch ztr\u00e1t\u00e1ch<\/span><\/h2>\n

Medic\u00edna d\u016fsledn\u011b doporu\u010duje zhubnout 0,5 a\u017e 1 kilogram t\u00fddn\u011b, co\u017e obvykle vy\u017eaduje denn\u00ed kalorick\u00fd deficit 500 a\u017e 750 kalori\u00ed.<\/span><\/p>\n

Toto tempo umo\u017e\u0148uje t\u011blu metabolicky se adaptovat, zachov\u00e1v\u00e1 svalovou hmotu a zabra\u0148uje hormon\u00e1ln\u00edm poruch\u00e1m, kter\u00e9 spou\u0161t\u011bj\u00ed leptinovou rezistenci a p\u0159et\u00ed\u017een\u00ed kortizolem.<\/span><\/p>\n

V recenzi z roku 2023 v odborn\u00e9m \u010dasopise\u00a0<\/span>Nutrients<\/span><\/em>\u00a0bylo zji\u0161t\u011bno, \u017ee lid\u00e9, kte\u0159\u00ed hubnou pomalu, maj\u00ed v\u00fdrazn\u011b v\u011bt\u0161\u00ed pravd\u011bpodobnost, \u017ee si sv\u00e9 v\u00fdsledky dlouhodob\u011b udr\u017e\u00ed v porovn\u00e1n\u00ed s t\u011bmi, kte\u0159\u00ed dr\u017e\u00ed p\u0159\u00edsnou dietu.<\/span><\/p>\n

Postupn\u00e9 hubnut\u00ed vede k v\u011bt\u0161\u00edmu \u00fabytku tukov\u00e9 hmoty v porovn\u00e1n\u00ed s \u00fabytkem celkov\u00e9 hmoty, zlep\u0161uje baz\u00e1ln\u00ed metabolismus a d\u00e1v\u00e1 endokrinn\u00edmu syst\u00e9mu \u010das na rekalibraci.<\/span><\/p>\n

Mezi kl\u00ed\u010dov\u00e9 strategie pro udr\u017eiteln\u00e9 hubnut\u00ed pat\u0159\u00ed:<\/span><\/p>\n