Naukowcy zdigitalizowali starzenie się — i wyniki są zaskakujące

Siedź sobie wygodnie, bo to, co zaraz przeczytasz, może zmienić twoje podejście do jedzenia na resztę życia.

Badacze z Uniwersytetu w Sydney przeprowadzili eksperyment, który wywrócił do góry nogami moje wyobrażenie o tym, jak szybko nasze ciało może zareagować na zmianę diety. Wzięli osoby w wieku od 65 do 75 lat, podzielili je na grupy i każda zjadła coś zupełnie innego przez zaledwie cztery tygodnie.

Cztery tygodnie!

I wiecie co? Aż trzy na cztery grupy wykazały oznaki młodszego wieku biologicznego. Młodszego. Po jednym miesiącu.

Czym w ogóle jest ten "wiek biologiczny"?

Zanim pójdziemy dalej, muszę wyjaśnić jedną rzecz, bo sama się nad tym chwilę zastanawiałam.

Twój wiek chronologiczny to po prostu liczba lat, którą masz na koncie. Ale wiek biologiczny? To zupełnie inna para kaloszy.

Wyobraź sobie dwa samochody tego samego modelu, oba teoretycznie pięcioletnie. Pierwszy był zawsze serwisowany, stał w garażu, a kierowca traktował go jak skarb. Drugi harował non-stop, rzadko widział olej w silniku i nocował pod chmurką.

Technicznie oba mają po pięć lat. Ale wszyscy wiemy, który z nich się szybciej rozleci, prawda?

Tak działają markery biologiczne. Mierzą one, jak dobrze funkcjonuje twoje ciało — serce, metabolizm, poziom stanów zapalnych — i na tej podstawie szacują, ile tak naprawdę "naliczył" twój organizm.

Dwóch siedemdziesięciolatków może mieć zupełnie inny wiek biologiczny. I właśnie to sprawia, że to badanie jest takie interesujące.

Jak wyglądało samo badanie?

Naukowcy zebrali 104 uczestników i losowo przydzielili ich do jednej z czterech grup dietetycznych. Kluczowy szczegół: każda dieta dostarczała taką samą ilość białka — 14 procent energii. Reszta się różniła.

Dwie grupy jadły mięso i produkty odzwierzęce (dieta wszystkożerna). Dwie inne to były diety półwegetariańskie, gdzie około 70 procent białka pochodziło z roślin.

Potem podzielono to jeszcze na wersje: wysokotłuszczowa lub wysokowęglowodanowa.

Wyszły więc cztery kombinacje: mięsna wysokotłuszczowa, mięsna wysokowęglowodanowa, roślinna wysokotłuszczowa i roślinna wysokowęglowodanowa.

Badacze monitorowali 20 różnych markerów — cholesterol, insulinę, białko C-reaktywne (wskaźnik stanu zapalnego) i inne. Na tej podstawie wyliczali wiek biologiczny każdego uczestnika.

Co się stało po czterech tygodniach?

Tu robi się ciekawie.

Trzy grupy na cztery wykazały spadek szacowanego wieku biologicznego. Jedyna grupa bez zmian? Mięsna wysokotłuszczowa — która i tak była najbliższa temu, co ci ludzie jedli na co dzień.

Najsilniejsze efekty zaobserwowano w grupie mięsnej wysokowęglowodanowej. Ich dieta wyglądała mniej więcej tak: 14 procent białka, 28-29 procent tłuszczu, 53 procent węglowodanów.

Zanim jednak rzucisz się po bułki i makaron — uwaga. Naukowcy są ostrożni. Dokładnie cytuję doktora Alistaira Seniora, jednego z prowadzących badanie:

"Jest zbyt wcześnie, żeby definitywnie stwierdzić, że konkretne zmiany w diecie przedłużą ci życie. Ale to badanie daje wczesne sygnały o potencjalnych korzyściach płynących ze zmian dietetycznych w późniejszym wieku."

Czyli: obiecujące, ale jeszcze nie na连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连连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