Fiskeolie reducerer aldersblindhed

14. oktober 2009

Nyt amerikansk studie viser, at indtagelse af fiskeolie kan reducere forekomsten af aldersblindhed med 30 %

Der synes ikke at være ende på fiskeoliens velsignelser.

Fiskeolierne er slutstadierne i udviklingen af omega-3 fedtsyrer, som fra alfalinolénsyre i en række processer omdannes til bl.a. eikosapentaénsyre (EPA) og dokosahexaénsyre (DHA), som så omdannes til prostaglandin E3 med en lang række sundhedsfremmende egenskaber.

Fiskeolierne EPA og DHA er nogen af de kraftigste antiinflammatoriske næringsmidler, vi kan indtage. Det er formentlig en af grundende til, at de nedsætter risikoen for blodpropper, men de nedsætter også blodets triglycerid, dæmper inflammationen ved gigtsygdomme, øger børns indlæringsevne, nedsætter risikoen for svangerskabsforgiftning og for tidlig fødsel, samt giver kvikkere børn til gravide, der har spist dem og meget meget mere.

Det er faktisk vanskeligt at se enden på de sundhedsfremmende egenskaber, vi kan hente fra fiskeolierne, og der synes hele tiden at dukke nye videnskabelige resultater frem, som støtter brugen.

Således også i sidste uge, hvor forskere fra National Eye Institute i Bethesda, MD, USA, 7.oktober publicerede et studie i American Journal of Clinical Nutrition.

Forskerne har igennem 12 år undersøgt 1.837 personer med moderat til svær risiko for aldersrelateret central blindhed i form af central atrofi eller maculadegeneration.

For begge typer blindhed viste det sig, at forekomsten var 30% lavere i den gruppe, der indtog mest fiskeolie ( 0,11% af det totale kalorieindtag ) i forhold til den gruppe, der indtog mindst.

Selv om tidligere studier har været usikre i sine konklusioner, mener forfatterne, at tallene kan generaliseres, er der tale om en både billig og let tilgængelig interventionsmulighed over for risikofamilier med høj forekomst af disse sygdomme.

I tider, hvor den kollektive konsensus har tudet os ørerne fulde af, at vi skal spise mindre fedt, er det vigtigt at bruge sin sunde fornuft, læse forskningen ordentligt og stå fast.

Fedt er sundt, og fedt er livsvigtigt!

Man skal naturligvis ikke vælte sig i margarine, pommes fritter og chips, men sørge for at spise godt af det sunde fedt som olivenolie og i særdeleshed fiskeolie.

Det kan indtages flydende, som kapsler, eller nok så indbydende som mad.

Fisk er ikke blot sundt, men smager jo også dejligt. Mange mennesker er dog urolige ved den stigende forekomst af tungmetaller i fisk, men hvis man undgår de store rovfisk som sværdfisk og tun, så er der væsentligt mindre i f.eks. laks og ørred, specielt hvis de er fanget i rene elve og søer.

Der er derimod problemer med de farmede fisk, som ofte indeholder temmelig meget omega-6 fedt, på grund af fiskefoderets sammensætning. Og det skal vi ikke have. Vi får i forvejen alt for meget omega-6, specielt linolsyre, som findes i de billige madolier med majs- og solsikkeolie, så for at undgå en yderligere skævvridning, må vi udvælge de fede fisk, som er fanget og ikke farmet.

Vi skal minde om, at vi i et tidligere nyhedsbrev har beskrevet to studier, som viste, at også æg indeholder stoffer, som forebygge den centrale aldersblindhed, så det kan være, vi snart ser et forbud mod et stykke med æg og sild. –Det forebygger jo en sygdom.

Velbekomme.
Claus Hancke


Referencer:

  • Sangiovanni JP, Agron E, et al. Omega-3 Long-chain polyunsaturated fatty acid intake and 12-y incidence of neovascular age-related macular degeneration and central geographic atrophy: a prospective cohort study from the Age-Related Eye Disease Study, Am J Clin Nutr, 2009 Oct 7 (E-pub. Ahead of print)
  • Mares JA, Larowe TL, et al. Predictors of optical density of lutein and zeaxanthin in retinas of older women in the Carotenoids in Age-Related Eye Disease Study, an ancillary study of the Women’s Health Initiative. Am J Clin Nutr., 2006, 84(5): 1107-1122.
  • Wenzel AJ, Gerweck C, et al. A 12-wk egg intervention increases serum zeaxanthin and macular pigment optical density in women. J Nutr., 2006; 136(10): 2568-2573.

Fedt er godt for øjnene

15. juni 2009

To nye studier tyder på, at den hyppigste årsag til funktionel blindhed kan forebygges med sunde fedtsyrer.

Dette nyhedsbrev har tidligere været inde på, at visse vitaminer og andre næringsmidler har en forebyggende virkning imod den aldersbetingede maculadegeneration (AMD), -altså en degeneration af tappene i den gule plet. De celler i nethinden, der er ansvarlige for vort centrale syn og vort farvesyn.

For nylig er der så tilkommet to nye videnskabelige studier fra Australien, som meget overbevisende sandsynliggør, at de sunde fedtsyrer forebygger denne hyppige synssvækkelse.

Det første viste, at høj indtagelse af omega-3 fedtsyrer og lav indtagelse af linolsyre beskytter mod AMD.

I dette studie blev 2454 mennesker fulgt i op til 10 år, hvor man registrerede forekomsten af AMD relateret til deres indtagelse af fisk, nødder eller fedtsyrer som tilskud.

Undersøgelsen viste en risikoreduktion på 31% og 35% hos de, der jævnligt spiste fisk og nødder eller indtog n-3 fedtsyrer (fiskeolie og hørfrøolie), og forfatterne tilråder at tilstræbe dette og undgå kost rig på linolsyre, som forekommer især i de billige madolier som f.eks. majsolie.

Det andet studie viste, at høj indtagelse af omega-3 fedtsyrer samt olivenolie nedsætter risikoen for AMD, og at høj indtagelse af trans-fedtsyrer øger risikoen.

Man undersøgte data fra 6734 mennesker mellem 58 og 69 år.
Det viste sig, at den højeste indtagelse af trans-fedtsyrer øgede risikoen for AMD med 76% i forhold til den laveste.

Modsat viste høj indtagelse af fiskeolie også her en reduceret risiko (15%).
Men mest overbevisende var, at høj indtagelse af olivenolie reducerede risikoen for AMD med hele 52%.

De sunde essentielle fedtsyrer er godt for stort set hver en celle i kroppen, og lige så meget skade kan de dårlige fedtstoffer forvolde.

Så lad os igen i denne fedtforskrækkede tid slå et slag for det gode fedt, som vi skal spise meget mere af.
Claus Hancke


Referencer:

• “Dietary fatty acids and the 10-year incidence of age-related macular degeneration: the Blue Mountains Eye Study,” Tan JS, Wang JJ, et al, Arch Ophthalmol, 2009; 127(5): 656-65.
• “Fat consumption and its association with age-related macular degeneration,” Chong EW, Robman LD, et al, Arch Ophthalmol, 2009; 127(5): 674-80

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Joseph E. Pizzorno Jr., Michael T. Murrey & Melvyn R. Werbach.