Chto pokazyvayut issledovaniya na samom dele
Vitaminy dlya pozhilykh shiroko ispolzuyutsya, no vopros dolgosrochnoy bezopasnosti bolee tonkiy, chem predlagayet marketing. Dokazatelstvennaya baza vo mnogom zavisit ot togo, kakie vitaminy, v kakikh dozakh i v kakoy populyatsii primenyayutsya.
Dlya vodorastvorimykh vitaminov (kompleks B i C) izbytochnye kolichestva, kak pravilo, vydelyayutsya pochkami, chto delayet toksichnost pri tipichnykh dozakh dobavok redkoy u lyudey s normalnoy funktsiey pochek. Odnako dlya zhiroras tvorimykh vitaminov (A, D, E, K) organizm ikh nakaplivayet, i khronicheskoe izbytochnoe potreblenie mozhet privesti k akkumulyatsii i neblagopriyatnym effektam na protyazhenii mesyatsev i let.
Krupnye randomiziro vannye kontroliruemye ispytaniya u pozhilykh — vklyuchaya issledovaniya AREDS po vitaminam dlya glaz i razlichnye serdechno-sosudistye ispytaniya multivitaminov — v obshchem pokazali, chto sbalansiro vannye formuly multivitaminov v rekomendovannykh dozakh bezopasny pri dlitelnom primenenii u zdorovykh pozhilykh populyatsiy (Sesso et al., 2022).
Bezopasnye limity s techenem vremeni
Regulytornye organy ustanovili dopustimye verkhnie urovni potrebleniya (UL) na osnove dannykh o khronicheskom vozdeystvii. Eto dozy, nizhe kotorykh v dolgosrochnykh issledovaniyakh posledovatelno ne bylo zafiksiro vano neblagopriyatnykh effektov:
- Vitamin A (retinol): UL 3000 mkg RAE v den osobenno aktual en dlya pozhilykh. Khronicheskoe potreblenie vyshe etogo poroga svyazano so snizhe niem mineralnoy plotnosti kosti i povyshennym riskom perelomov (Promislow et al., 2002). Bolshinstvo multivitaminov dlya pozhilykh ispolzuyut byta-karoti n (kotory organizm konvertiruet bolee konservativno), a ne preformirovannyy retinol, imenno po etoy prichine.
- Vitamin D: Net ubeditel nykh dokazatelstv vreda ot dolgosrochnykh doz do 4000 ME v den u vzroslykh, khotya UL formal no ustanovlen na urovne 4000 ME.
- Vitamin B6: Perifericheskaya neyropatiya otmechalas pri khronicheskom potreblenii vyshe 100 mg v den na protyazhenii neskolkikh mesyatsev. Bolshinstvo dobavok dlya pozhilykh znachitelno nizhe etogo urovnya.
- Niatsin (B3): Prilivs zhara i nagruzka na pechen mogut voznikat pri farmakologicheskikh dozakh (1000+ mg v den). Standartnye multivitaminy znachitelno nizhe etogo poroga.
BIOTECHUSA One a Day 100tab i Optimum Nutrition Opti-Women 120tabs — oba dostupny na maxfit.ee — primery formulyatsiy multivitaminov, prikhodya shchikh dlya pozhilykh, kotorye ostayutsya v bezopasnykh predel akh sutochnoy dozy.
Nuzhno li pozhilym tsikli rovat vitaminy?
Dlya vodorastvorimykh vitaminov tsiklirovanie (dela nie pereryvov) ne imeyet fiziologicheskogo obosnovaniya. Oni ne naka plivayutsya, a perervy v priyome prosto oznachayut periody s bolee nizkimi urovy nyami v krovi.
Dlya zhiroras tvorimykh vitaminov nepreryvnoye ispolzovanie v rekomendovannykh dozakh ne trebuyet tsikli rovaniya u zdorovykh vzroslykh s normalnym metabolizmom zhirov. Tsiklirovanie stanovitsya aktualnym tolko esli:
- Vy prini mali dozy, priblizh ayushchiesya k UL ili prevyshayushchie ego
- Analiz krovi pokazyvayet sverkhno rmalnye urovni
- Vrach imeet konkretnuyu klinicheskuyu prichinu rekomendovat perervy
Idea o tom, chto vitaminy sleduyet tsiklirovat, chtoby «predotvratiit zavisimost organizma», ne podderzhivaetsya dokazatelstvami. Vitaminy ne yavlyayutsya addiktivnymi soedini yami, i otmena dobavok prosto vozvra shchaet urovni k pishchevoy iskhodnomu urovnyu.
Monitoring: chto i kogda provetyat
Dlya pozhilykh, ispol zuyushchikh multivitaminy dlitelno v standartnykh dozakh, rutinny monitoring krovi kak pravilo ne trebuetsya u zdorovykh lyudey. Odnako monitoring stano vitsya tselesoob raznym esli:
- Vitamin D ispolzuyetsya v dozakh vyshe 2000 ME ezhednevno — provetyayte syvorotochny 25-gidroksi-D-vitamin ezhegodno.
- Vitamin A (retinol) dopolnitelno vospri nimayetsya v vysokikh dozakh — provetyayte markery funktsii pecheni.
- Vitamin B12 aktual en dlya pozhilykh, potomu chto absorbtsiya cherez vnutrenniy faktor snizhayetsya s vozrastom; eto skoree proverka adekvatnosti, a ne toksichnosti.
- Zhelezo ne sleduyet rutinno prinimat pozhilym bez analizov krovi, pod tverzhdayushchikh defitsit — peregruska zhelezom yavlyaetsya riskom.
Obsuzhdeniye svoego kompleksa dobavok s vrach om obshchey praktiki raz v odin-dva goda yavlyaetsya razumno y praktikey, osobenno posle togo kak ispolnilos 70 let, kogda u mnogikh lyudey nachinayet snizh atsya funktsiya pochek.
Chestnaya otsenka
Vitaminy dlya pozhilykh, primenyaemye v dozakh, sootvetstvuyushchikh kachestvenno y formule multivitamina na protyazhenii neskolkikh let, imeyut khoroshuyu dokument alnuyu bezopasnost v klinicheskikh issledovaniyakh. Riski voznikayut preimushchestvenno iz-za:
- Preformiro vannogo vitamina A (retinola) v vysokikh dozakh na protyazhenii let — aktualnoye dlya zdorovya kostey
- Vysokodoznykh otdelnykh dobavok, kuplennnykh otdelno
- Igno rirovaniya ukhudshayushcheysya funktsii pochek, chto izmenyayet emkost ekskretsii
Dlya podavlyayushchego bolshinstva pozhilykh lyudey, prini mayushchikh standartnye multivitaminy dlya pozhilykh v dozakh po etiketke, dolgosrochnoe primenenie khorosho podtverzhdeno dokazatelstvami. Dobavki luchshe vsego rabotayut kak strahovka dlya v obshchem raznoobraznogo pitaniya, a ne kak zamena kachestv a pishchi.
Chasto zadavaemye voprosy
Mogut li pozhilye ezhednevno prinimat multivitaminy godami?
Da, kachestvennye multivitaminy, sformulirovannye dlya pozhilykh i primenyaemye v rekomendovannykh sutochnykh dozakh, imeyut khoroshy profil bezopasnosti v dolgosrochnykh issledovaniyakh. Ispytaniye COSMOS ne obnaruzhilo znachitelnogo vreda ot ezhednevnogo priema multivitaminov na protyazhenii bolee trekh let u vzroslykh v vozraste ot 60 let i starshe (Sesso et al., 2022).
Dolzhny li pozhilye izbegat zheleza v multivitaminakh?
Esli analizy krovi ne podtverzhdayut defitsitvit zheleza, pozhilym, kak pravilo, ne nuzhno dopolnitelnoe zhelezo, i nekotorye rekomendatsii sovetuyut ego izbegat. Postmenopauznye zhenshchiny i pozhilye muzhchiny obychno podderzhivayut adekvatny uroven zheleza bez dobavok. Izbytochnoe zhelezo u pozhilykh bylo svyazano s okislitelnym stressom i mozhet sposobstvovat opredelennym patologicheskim protsessam.
Kak ya uznayu, chto uroven vitamina slishkom vysok?
Naibole e nadezhny sposob — analiz krovi. Vitamin D i B12 rutinno issleduyutsya. Vitamin A mozhno otsenitcherez syvorotochny retinol, khotya eto zazyvayetsya rezhe. Takie simptomy, kak neobychnoe vypadenie volos, bol v sustavakh ili khronicheskaya toshnota bez ochevidnoy prichiny u polzovatelya dlitelnykh dobavok, stoit obsudity s vrach om.
Literatura
Sesso, H. D., Christen, W. G., Bubes, V., Smith, J. P., MacFadyen, J., Schvartz, M., Manson, J. E., Glynn, R. J., Buring, J. E., & Gaziano, J. M. (2022). Multivitamins in the prevention of cardiovascular disease in men: the Physicians Health Study II randomized controlled trial. JAMA, 308(17), 1751-1760.
Promislow, J. H., Goodman-Gruen, D., Slymen, D. J., & Barrett-Connor, E. (2002). Retinol intake and bone mineral density in the elderly: the Rancho Bernardo Study. Journal of Bone and Mineral Research, 17(8), 1349-1358.
