Weight Loss Evidence

Prehrana

Koliko proteina za mršavljenje?

Proteini su makronutrijent s najjasnijim opravdanjem u mršavljenju, a razlozi su zanimljiviji od "održava osjećaj sitosti".

Updated 3 min read 28 citations Evidence strength 4/5

Štandovi sa svježim namirnicama pod željeznim krovom Borough Marketa u Bedale Streetu, London
Txllxt TxllxT · CC BY-SA 4.0 · Wikimedia Commons

Zašto proteini imaju takav ugled

Tri odvojena mehanizma, što je neobično za tvrdnju iz područja prehrane. Proteini imaju najviši termički učinak od svih makronutrijenata, pa se skroman dio njihove energije potroši na probavu. Najviše zasićuju po kaloriji, a taj učinak na osjećaje apetita u osoba s prekomjernom težinom potvrđen je sustavnim pregledom [2]. Osim toga, proteini su substrat za očuvanje nemasne mase tijekom energetskog deficita, što je važno jer nemasna masa opada uz svako značajnije mršavljenje.

Proteini i sitost

Hipoteza o poluzi proteina

Ovo je najzanimljivija ideja na tom području. Hipoteza tvrdi da ljudi strože reguliraju unos proteina nego ukupni energetski unos — da nastavljamo jesti dok se ne postigne ciljna razina proteina [4]. Ako je to točno, dijeta s razrijeđenim udjelom proteina prisiljava na prekomjeran unos svega ostalog da bi se dosegla ista apsolutna količina proteina.

To bi elegantno objasnilo dio povezanosti s ultraprocesiranom hranom, jer su takve dijete obično razrijeđene proteinima — vidi ultraprocesirana hrana. Hipoteza ima potporu, ali nije univerzalno prihvaćena; treba ju smatrati obećavajućim okvirom, a ne utvrđenim mehanizmom.

Koliko

Okvirne preporuke iz interventne literature
SituacijaProteini po kg tjelesne težine dnevnoNapomena
Opće zdravlje, bez deficita0,8 g (RDA)Minimum za sprječavanje deficita, a ne optimum
Mršavljenje, sjedilački način života1,2-1,6 gZa sitost i očuvanje nemasne mase
Mršavljenje uz trening otpora1,6-2,0 gGornja granica tijekom agresivnih deficita
Starije osobe1,2-1,5 gAnabolička rezistencija povećava potrebe
Uz lijekove koji suzbijaju apetit1,2-1,6 gNajteže postići; zahtijeva planiranje

Za osobe s izraženim viškom kilograma, računanje prema ciljnoj, a ne trenutnoj tjelesnoj težini izbjegava napumpane brojke.

Izvor: je li važan?

Manje nego što bi se moglo pomisliti iz raspravi. Randomizirano ispitivanje iz 2025. godine pronašlo je slične učinke između proteina životinjskog i biljnog podrijetla [5], što je u skladu sa širom slikom prema kojoj su ukupni unos i sadržaj leucina važniji od podrijetla. Biljni izvori imaju niži sadržaj leucina i nižu probavljivost, pa su blago viši ukupni unosi razumni — ne radi se o drugačijoj strategiji.

Suplementacija sirutkinim proteinima meta-analizirana je u žena u postmenopauzi [1], a randomizirana crossover intervencija promjene životnog stila donosi dodatne podatke iz ispitivanja [6].

Aspekt vezan uz kosti

Mršavljenje smanjuje mineralnu gustoću kosti — zbog mehaničkog rasterećenja i smanjenog unosa nutrijenata važnih za kosti. Meta-analiza je ispitala učinak količine prehrambenih proteina na kosti nakon mršavljenja [3] i utvrdila da je veći unos proteina povoljan. To obrće staru tvrdnju da visok unos proteina šteti kostima putem kiselinskog opterećenja, tvrdnju koja nije opstala pod detaljnijom provjerom.

Često postavljana pitanja

Mogu li unositi previše proteina?
U praksi su ograničenja apetit i istiskivanje druge hrane iz prehrane. Ne postoji utvrđen prag štetnosti u osoba s normalnom funkcijom bubrega.
Treba li mi protein u svakom obroku?
Raspodjela unosa tijekom dana skromno pomaže sintezi mišićnih proteina. Ukupni dnevni unos važniji je.
Je li biljni protein lošiji?
Ispitivanje iz 2025. godine pronašlo je slične učinke [5]. Blago viši ukupni unosi kompenziraju niži sadržaj leucina i nižu probavljivost.
Treba li mi dodatak prehrani?
Samo ako hranom ne mogu postići cilj. Postaje istinski koristan kada je apetit suzbijen lijekovima ili kada je prozor za jelo sužen.
Repa, pastrnjak, mrkva i cikla izloženi zajedno na tržnici
Korjenasto povrće se dobro čuva, zbog čega dominira zimskom prehranom u sjevernoj Europi. Beatrice Murch · CC BY-SA 2.0 · Wikimedia Commons

Povezano štivo

Dokazi na kojima se temelji ova stranica Stupčasti grafikon koji prikazuje sastav 17 publikacija citiranih na ovoj stranici, prema vrsti studije. 494meta-analysis (4)randomised trial (9)review (4)
17 publikacija, 2006.–2025. Riječ je o miješanom skupu koji sadrži i klinička ispitivanja i sinteze, što je pozicija s koje je tvrdnja o uzročnosti opravdana. Izvor: popis citata ove stranice, u nastavku.

References

Every citation below links to the original peer-reviewed record on PubMed or via DOI. Nothing here is a substitute for medical advice.

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