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© 2003 The American Society for Nutritional Sciences J. Nutr. 133:1255-1258, May 2003

Biochemical and Molecular Actions of Nutrients

The Addition of Soybean Phosphatidylcholine to Triglyceride Increases Suppressive Effects on Food Intake and Gastric Emptying in Rats

Megumi Nishimukai, Hiroshi Hara1 and Yoritaka Aoyama

Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan

1To whom correspondence should be addressed. E-mail: hara{at}chem.agr.hokudai.ac.jp.

The physiologic roles of dietary lecithin have not yet been clearly defined. We examined the effects of soybean lecithin on gastric emptying (Experiments 1 and 2) and food intake (Experiment 3) in rats. Male Wistar rats were fed 2 g of a 20 g lipid/100 g diet containing various levels of lecithin after 24 h of food deprivation; gastric contents were collected 3 h after feeding (Experiment 1). In Experiment 2, the effects of lecithin and a CCK-A receptor antagonist on gastric emptying were examined using a modified phenol red recovery technique. In Experiment 3, their effects on food intake were examined after an intraduodenal infusion of an oil emulsion containing 50 mg soybean oil (SO) or SO partially replaced by lecithin (14–50%). Gastric emptying rates of the lipid and protein in the test diet (Experiment 1) or of phenol red (Experiment 2) were lower in the groups administered lecithin. Food intake for 60 min was lower in rats infused with the oil emulsion containing lecithin (25, 50%) than in rats not administered lecithin. The suppressive effects of lecithin on gastric emptying and food intake were largely reduced by devazepide. These results demonstrate that oil containing lecithin inhibits gastric emptying and food intake, and the effects are associated in part with CCK release.

KEY WORDS: • soybean phosphatidylcholine • gastric emptying • food intake • cholecystokinin • rats






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