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Human Nutrition and Metabolism

Dietary Medium-Chain Triacylglycerols Suppress Accumulation of Body Fat in a Double-Blind, Controlled Trial in Healthy Men and Women

Hiroaki Tsuji^*,1, Michio Kasai^*, Hiroyuki Takeuchi^*, Masahiro Nakamura^*, Mitsuko Okazaki and Kazuo Kondo^**

Division of Healthcare Science Research Laboratory, Nisshin Oil Mills, Ltd., Kanagawa 239-0832, Japan; Kagawa Nutrition University, Saitama 350-0288, Japan; and the Institute of Environmental Science for Human Life, Ochanomizu University, Tokyo 112-8610, Japan. ^{** *}

¹To whom correspondence should be addressed. E-mail: hiroaki.tsuji{at}nisshin-seiyu.co.jp

ABSTRACT

We investigated the effect of long-term ingestion of dietary medium-chain triacylglycerols (MCT) on body weight and fat in humans. Using a double-blind, controlled protocol, we assessed the potential health benefits of MCT compared with long-chain triacylglycerols (LCT) in 78 healthy men and women [body mass index (BMI) 23 kg/m²: n = 26 (MCT), n = 30 (LCT); BMI < 23 kg/m²: n = 15 (MCT), n = 7 (LCT)]. Changes in anthropometric variables, body weight and body fat during the 12-wk MCT treatment period were compared with those in subjects consuming the LCT diet. The subjects were asked to consume 9218 kJ/d and 60 g/d of total fat. The energy, fat, protein and carbohydrate intakes did not differ significantly between the groups. Body weight and body fat in both groups had decreased by wk 4, 8 and 12 of the study. However, in the subjects with BMI 23 kg/m², the extent of the decrease in body weight was significantly greater in the MCT group than in the LCT group. In subjects with BMI 23 kg/m², the loss of body fat in the MCT group (-3.86 ± 0.3 kg) was significantly greater than that in the LCT group (-2.75 ± 0.2 kg) at 8 wk. In addition, in subjects with BMI 23 kg/m², the decrease in the area of subcutaneous fat in the MCT group was significantly greater than that in the LCT group at wk 4, 8 and 12. These results suggest that the MCT diet may reduce body weight and fat in individuals (BMI 23 kg/m²) more than the LCT diet.

KEY WORDS: • fat intake • medium-chain triacylglycerols • body mass index • body fat • obesity • humans

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