Objective: This study has investigated the effects of walnut consumption on the serum lipids and especially small dense lowdensity lipoprotein (sdLDL) values of healthy volunteers. Material and Methods: Volunteers participating in this study were asked to consume 30 grams of walnuts per day. Walnuts were presented to individuals in packages and were asked to consume at breakfast every morning for 21 days. An short message service (SMS) reminder was made every day so that individuals would not forget to intake walnuts. The blood values of subjects were measured at the beginning and the end of the study. Serums were obtained from the collected blood, and blood lipid parameters were analyzed routinely in the biochemistry laboratory. The sdLDL parameter was analyzed by the ELISA method. Results: The effect of walnut consumption on the lipid parameters was investigated. It was found that regular walnut consumption has significantly decreased the LDL (p<0.001), total cholesterol (p<0.001), sdLDL (p<0.001), and HDL (p=0.008) parameters. A significant change was not observed for the triglyceride levels. Besides, there is a statistically significant difference in carbohydrate, linoleic acid, and a-linolenic acid intake compared to Turkey Nutrition and Health Research. There was no significant difference in the individuals' energy, cholesterol, monounsaturated fatty acid, and saturated fatty acid intakes Also, food consumption record form was obtained from individuals. Conclusion: In this study, supplementation walnut to the healthy volunteers' diet has reduced LDL, sdLDL, and total cholesterol levels. We think that walnut consumption has a protective effect especially on cardiovascular risk factors.
Keywords: Serum lipids; nutritional habits; small dense low-density lipoprotein; walnut consumption
Amaç: Bu çalışmada, sağlıklı gönüllülerin ceviz tüketiminin serum lipid ve özellikle küçük yoğun düşük yoğunluklu lipoprotein [small dense low-density lipoprotein (sdLDL)] değerleri üzerine etkileri araştırılmıştır. Gereç ve Yöntemler: Bu çalışmaya katılan gönüllülere günde 30 gram ceviz ikram edilmiştir. Cevizler paketler hâlinde kişilere takdim edilmiş ve 21 gün boyunca her sabah kahvaltıda tüketilmesi istenmiştir. Bireylerin ceviz alımını unutmamaları için her gün kısa mesaj hizmeti (SMS) ile hatırlatma yapılmıştır. Bireylerin kan değerleri çalışmanın başında ve sonunda ölçülmüştür. Toplanan kandan serumlar elde edilmiştir ve kan lipid parametreleri rutin olarak biyokimya laboratuvarında analiz edilmiştir. Küçük yoğun LDL parametresi ise ELISA yöntemi ile analiz edilmiştir. Ayrıca kişilerden besin tüketim kaydı formu alınmıştır. Bulgular: Ceviz tüketiminin lipid parametreleri üzerindeki etkisi incelenmiştir. Düzenli ceviz tüketiminin LDL (p<0.001), toplam kolesterol (p<0.001), sdLDL (p<0.001) ve HDL (p=0.008) parametrelerinde anlamlı bir düşüş yarattığı bulunmuştur. Trigliserid seviyelerinde önemli bir değişiklik gözlenmemiştir. Ayrıca karbonhidrat, linoleik asit ve a-linolenik asit alımında Türkiye Beslenme ve Sağlık Araştırmasına göre istatistiksel olarak anlamlı farklılık vardır. Bireylerin enerji, kolesterol, tekli doymamış yağ asidi ve doymuş yağ asidi alımlarında önemli bir fark bulunmamıştır. Sonuç: Bu çalışmada, sağlıklı gönüllülerin diyetine ceviz eklenmesi LDL, sdLDL ve toplam kolesterol seviyelerini düşürmüştür. Ceviz tüketiminin özellikle kardiyovasküler risk faktörleri üzerinde koruyucu bir etkisinin olduğunu düşünüyoruz.
Anahtar Kelimeler: Serum lipidleri; beslenme alışkanlıkları; küçük yoğun düşük yoğunluklu lipoprotein; ceviz tüketimi
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