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Ce sunt grasimile hidrogenate si cum ne afecteaza organismul

de WikiFood / 2011-08-18 | tag-uri: grasimi, grasimi hidrogenate, grasimi trans, acizi grasi trans

8  voturi
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Ce sunt grasimile hidrogenate si cum ne afecteaza organismul
Majoritatea oamenilor sunt tentati sa cumpere diverse alimente de la supermarket fara sa acorde foarte mare atentie etichetei. Unele alimente pot deveni foarte nocive atunci cand vine vorba de grasimile hidrogenate si acizii grasi trans.

Ce este si mai rau este ca nu pot fi depistate intotdeauna usor produsele alimentare care le contin. In cele ce urmeaza vom afla ce tipuri de alimente contin grasimi trans si cum putem reduce nivelul colesterolului cauzate de acestea.

Ce sunt grasimile hidrogenate

Acestea sunt uleiuri vegetale, care sunt transformate in grasimi semi-tari (fiind mai usor de manipulat si de transportat), care prin reactia lor cu hidrogenul, da nastere la procesul cunoscut sub numele de hidrogenare. Utilizarea grasimilor hidrogenate corespund cu anii '60 si '70 fiind folosite in margarina, chips-uri, biscuiti, prajituri si produse de patiserie, aceasta perioada a aparut odata cu preocuparile privind cantitatea de grasime animala consumata.

Utilizarea lor a crescut de-a lungul anilor astfel ca astazi tot mai multe produse alimentare se prepara cu aceste grasimi hidrogenate cum ar fi semipreparatele si produsele de tip fast food.

Din pacate, prin procesul de hidrogenare se produce un procent de grasimi modificate chimic numiti acizi grasi trans sau grasimi trans, care s-au dovedit a fi daunatoare sanatatii.

De ce sunt atat de nocive grasimile hidrogenate

Cercetarile au aratat ca cel putin 30.000 de oameni din SUA mor prematur de boala coronariana, ca urmare a consumului de grasimi trans. Daca Britanicii mor in proportii similare, acest lucru inseamna ca mor aproximativ 5.000 de persoane prematur in fiecare an in Marea Britanie sau 14 in fiecare zi.

Studiile stiintifice au aratat ca acizii grasi trans provoaca deteriorarea prin cresterea nivelului de colesterol LDL, care se lipeste de peretii arterelor si restrictioneaza fluxul de sange, in timp ce scaderea este provocata de niveluri de colesterol HDL, care ne protejeaza de bolile de inima. Exista, de asemenea, unele dovezi controversate conform carora grasimile trans pot creste riscul de diabet zaharat, riscul de cancer si chiar interfereaza in functionarea creierului.

Unii oameni de stiinta cred ca structura chimica a grasimilor trans afecteaza celulele creierului si perturba sistemele normale de mesagerie, care contribuie la dislexie si hiperactivitate in cazul copiilor. Excesul de grasimi trans pot afecta dezvoltarea fatului.

Produse care contin grasimi hidrogenate

Vestea buna este ca publicitatea negativa cu privire la uleiurile hidrogenate si acizi grasi trans au ridicat un semnal de alarma la adresa producatorilor care le-au scos treptat din gama de produse. Acum este putin probabil sa le gasesti in:
- Margarina tartinabila aproape toate sortimentele de pe piata contin acum cantitati de grasimi trans nesemnificative.
- Biscuiti - McVities este un producator mare care a eliminat grasimile hidrogenate si multe alte supermarketuri au procedat in aceeasi maniera.

Exiata insa si vesti proaste, in ciuda imbunatatirilor, grasimile hidrogenate inca exista intr-o serie de produse alimentare, precum:

- Produsele de patiserie - cele mai multe tipuri, placinte, tarte, contin uleiuri hidrogenate, care in combinatie cu grasimile saturate fac produsele de patiserie extrem de nesanatoase.
- Grasimile greu de gatit
- Fast food: cartofii prajiti si burgerii pot fi fierti in ulei hidrogenat sau in uleiuri non-hidrogenate care au fost refolosite de mai multe ori (acest lucru poate duce la formarea de grasimi trans, de asemenea).
- Torturi: ieftin, acestea sunt intarite cu uleiuri vegetale care sunt adesea utilizate pentru prepararea lor. 
- Pranzul de la scoala: este o alta sursa ingrijoratoare de grasimi trans.

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