Forum - Stowarzyszenie Empatia

faf napisał(a):jedno mnie zastanawia- w formie odzwierzęcej kwasy omega 3 spożywają głównie amatorzy surowizny patrz. np Japończycy, o oleju lnianym mało kto słyszał, a przy podawanej przez Was cenie (17 zeta za 0,25l...) raczej zbyt szybko nie usłyszy a to znaczy, że ogromna część globu jest przez większość swego życia pozbawiona tychże kwasów... i specjalnie się tym nie przejmuje...

no cóż, może faktycznie nie ma co przesadzać, bo wychodzi na to, że również ich nie spożywałem przez większą część swojego życia... i jakoś tam funkcjonuję...

co jakiś czas pojawiają się rewelacje typu "naukowcy odkryli, że..." po czym wszyscy, których stać (!) biegną do aptek po nowy cudowny eliksir, który będzie panaceum na wszelkie nasze dolegliwości. gdy się przekroczy próg któregokolwiek ze sklepów ze zdrową żywnością półki aż uginają się pod ciężarem czarownych nalewek... A ile w tym zwykłego marketingu? No i czy koniec końcem faktycznie zamiast w spożywczaku, powinienem wydawać swoją wypłatę w aptekach? no i czy wreszcie moja wypłata starczy na te zakupy, bo ceny są zaiste zjawiskowe...

K.Biernacka napisał(a):Wg Physicians Committee for Responsible Medicine, najnowsze badania dowodzą braku korzystnego działania kwasów omega-3 na serce. Innymi słowy, mylić mają się ci, którzy zachęcają ludzi do jedzenia ryb w trosce o zdrowe serce (ludzi rzecz jasna, bo troski o serce ryb dopatrzyć się tu oczywiście nie sposób)

gzyra napisał(a):Nie chcę teraz wrzucać granatu do naszej norki, ale jestem bardzo ostrożny w poleganiu na PCRM jak na wyroczni. (...)

"Women on Vegan Diets Have More Long-Chain Omega-3s, Compared with Fish-Eaters"

Women following vegan diets have significantly more omega-3 “good fats” in their blood, compared with fish-eaters, meat-eaters, and ovo-lacto vegetarians, according to a new report from the European Prospective Investigation into Cancer and Nutrition (EPIC) Study. Levels in vegan men were not quite as high as in vegan women. Despite zero intake of long-chain omega-3s eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) and substantially lower intake of their plant-derived precursor alpha-linolenic acid (ALA), vegan participants converted robust amounts of shorter-chain fatty acids into these long-chain fatty acids. The study included 14,422 men and women aged 39 to 78.

Am J Clin Nutr. 2010 Nov;92(5):1040-51. Epub 2010 Sep 22.
Dietary intake and status of n-3 polyunsaturated fatty acids in a population of fish-eating and non-fish-eating meat-eaters, vegetarians, and vegans and the precursor-product ratio of α-linolenic acid to long-chain n-3 polyunsaturated fatty acids: results from the EPIC-Norfolk cohort.

Welch AA, Shakya-Shrestha S, Lentjes MA, Wareham NJ, Khaw KT.

School of Medicine Health Policy and Practice, University of East Anglia, Norwich, United Kingdom. a.welch@uea.ac.uk
Abstract

BACKGROUND: Intakes of n-3 (omega-3) polyunsaturated fatty acids (PUFAs) are important for health. Because fish is the major source of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), non-fish-eaters may have suboptimal n-3 PUFA status, although the importance of the conversion of plant-derived α-linolenic acid (ALA) to EPA and DHA is debated.

OBJECTIVE: The objective was to determine intakes, food sources, and status of n-3 PUFAs according to dietary habit (fish-eaters and non-fish-eating meat-eaters, vegetarians, or vegans) and estimated conversion between dietary ALA and circulating long-chain n-3 PUFAs.

DESIGN: This study included 14,422 men and women aged 39-78 y from the EPIC (European Prospective Investigation into Cancer and Nutrition)-Norfolk cohort with 7-d diary data and a substudy in 4902 individuals with plasma phospholipid fatty acid measures. Intakes and status of n-3 PUFAs were measured, and the precursor-product ratio of ALA to circulating n-3 PUFAs was calculated.

RESULTS: Most of the dietary intake of EPA and DHA was supplied by fish; however, meat was the major source in meat-eaters, and spreading fats, soups, and sauces were the major sources in vegetarians. Total n-3 PUFA intakes were 57-80% lower in non-fish-eaters than in fish-eaters, but status differences were considerably smaller. The estimated precursor-product ratio was greater in women than in men and greater in non-fish-eaters than in fish-eaters.

CONCLUSIONS: Substantial differences in intakes and in sources of n-3 PUFAs existed between the dietary-habit groups, but the differences in status were smaller than expected, possibly because the precursor-product ratio was greater in non-fish-eaters than in fish-eaters, potentially indicating increased estimated conversion of ALA. If intervention studies were to confirm these findings, it could have implications for fish requirements.

PMID: 20861171 [PubMed - indexed for MEDLINE]

(...)Vegans Convert DHA Better than Fish Eaters

In other DHA news, a study from EPIC-Norfolk recently came out showing that while vegans have lower levels of DHA in their blood, they are more efficient at converting ALA to DHA than people who eat fish (2). This is not surprising, as a 2008 abstract by the same lead author was published in 2008 finding the same thing. You can see the EPA and DHA levels in Table 4 of Omega-3 Fatty Acid Recommendations for Vegetarians.

There were only 5 vegan men and 5 vegan women in this study. Despite the higher conversion rate, the vegan men still had significantly lower DHA levels than the fish-eaters. However, the vegan women actually had the highest DHA levels of any diet group (although the standard deviations was quite large indicating that some of the women had very high levels and some had very low). The authors did not address this unusual finding.(...)