Abstract
Energy restriction affects circulating leptin and ghrelin concentrations. To investigate whether seafood consumption affects fasting leptin and ghrelin concentrations in addition to weight loss. In this 8-week dietary intervention, subjects (324 Icelandic, Spanish and Irish subjects, 20-40 years, BMI 27.5-32.5 kg/m(2)) were randomized to energy-restricted diets (-30%) of identical macronutrient composition but different amount of seafood: control (no seafood); lean fish (150 g cod, three times per week); fatty fish (150 g salmon, three times per week); EPA&DHA [daily docosahexaenoic (DHA)/eicosapentaenoic acid (EPA) capsules]. Anthropometric data, ghrelin, leptin, and insulin were measured at baseline and endpoint. Linear models investigated the effects of seafood on fasting leptin, ghrelin and insulin. Body weight (-5.2 +/- 3.0 kg), leptin (-34.8%) and insulin (-13.5%) decreased, while ghrelin increased (5.6%) (all P < 0.001). According to linear models endpoint insulin was significantly lower in the EPA&DHA group (-16.4%, P = 0.025) compared to control, endpoint leptin in men was lower in the salmon group (-22.9%, P = 0.026), and the EPA&DHA group tended to have higher endpoint ghrelin (5.6%, P = 0.060), an effect seen only i...Continue Reading
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