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Linseed Dietary Fibers Reduce Apparent Digestibility of Energy and Fat and Weight Gain in Growing Rats
Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, 1958 Frederiksberg C, Denmark
Department of Animal Science—Molecular nutrition and cell biology, Aarhus University, 8830 Tjele, Denmark
Pacific Agri-Food Research Centre—Summerland, Agriculture and Agrifood Canada, Summerland, British Columbia V0H 1Z0, Canada
Reduce-Center, 4000 Roskilde, Denmark
National Food Institute, DTU FOOD, 2860 Søborg, Denmark
* Author to whom correspondence should be addressed.
Received: 1 June 2013; in revised form: 1 August 2013 / Accepted: 6 August 2013 / Published: 19 August 2013
Abstract: Dietary fibers (DF) may affect energy balance, an effect often ascribed to the viscous nature of some water soluble DF, which affect luminal viscosity and thus multiple physiological processes. We have tested the hypothesis that viscous linseed DF reduce apparent nutrient digestibility, and limit weight gain, in a randomized feeding trial where 60 male, growing, Wistar rats, with an initial weight of ~200 g, were fed different diets (n = 10 per group): low DF control (C), 5% DF from cellulose (5-CEL), CEL + 5% DF from whole (5-WL) or ground linseed (5-GL), CEL + 5% DF from linseed DF extract (5-LDF), and CEL + 10% DF from linseed DF extract (10-LDF). Diets were provided ad libitum for 21 days. Feed intake and faecal output were measured during days 17–21. Faecal fat excretion increased with increasing DF content and was highest in the 10-LDF group. Apparent fat digestibility was highest with the C diet (94.9% ± 0.8%) and lowest (74.3% ± 0.6%) with the 10-LDF diet, and decreased in a non-linear manner with increasing DF (p < 0.001). Apparent fat digestibility also decreased with increased accessibility of DF (5-WL vs. 5-GL) and when the proportion of viscous DF increased (5-GL vs. 5-LDF). The 10-LDF resulted in a lower final body weight (258 ± 6.2 g) compared to C (282 ± 5.9 g), 5-CEL (281 ± 5.9 g), and 5-WL (285 ± 5.9 g) (p < 0.05). The 10-LDF diet reduced body fat compared to 5-CEL (p < 0.01). In conclusion, DF extracted from linseed reduced apparent energy and fat digestibility and resulted in restriction of body weight gain in growing rats.
Keywords: dietary fibers; linseed; fat digestibility; obesity
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Kristensen, M.; Knudsen, K.E.B.; Jørgensen, H.; Oomah, D.; Bügel, S.; Toubro, S.; Tetens, I.; Astrup, A. Linseed Dietary Fibers Reduce Apparent Digestibility of Energy and Fat and Weight Gain in Growing Rats. Nutrients 2013, 5, 3287-3298.
Kristensen M, Knudsen KEB, Jørgensen H, Oomah D, Bügel S, Toubro S, Tetens I, Astrup A. Linseed Dietary Fibers Reduce Apparent Digestibility of Energy and Fat and Weight Gain in Growing Rats. Nutrients. 2013; 5(8):3287-3298.
Kristensen, Mette; Knudsen, Knud E.B.; Jørgensen, Henry; Oomah, David; Bügel, Susanne; Toubro, Søren; Tetens, Inge; Astrup, Arne. 2013. "Linseed Dietary Fibers Reduce Apparent Digestibility of Energy and Fat and Weight Gain in Growing Rats." Nutrients 5, no. 8: 3287-3298.