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Energy Intake, Ghrelin, and Cholecystokinin after Different Carbohydrate and Protein Preloads in Overweight Men

Commonwealth Scientific and Industrial Research Organization (J.B., M.N., P.M.C.), Human Nutrition, Adelaide SA 5000, Australia; Department of Physiology (J.B.), University of Adelaide, Adelaide SA 5000, Australia; and Department of Primary Industries (C.T.), Primary Industries Research Victoria, Werribee VIC 3030, Australia

Address all correspondence and requests for reprints to: J. Bowen, Commonwealth Scientific and Industrial Research Organization, Human Nutrition, P.O. Box 10041 BC, Adelaide SA 5000, Australia. E-mail: jane.bowen{at}csiro.au.

Context: Dietary proteins appear to be more satiating than carbohydrate. The mechanism and effect of protein and carbohydrate type are unclear.

Objective: The objective of the study is to compare the acute effect of different proteins and carbohydrates on indicators of appetite and appetite regulatory hormones.

Design: This is a randomized cross-over study of four orally consumed preloads followed by blood sampling (+15, 30, 45, 60, 90, 120, 180 min), then a buffet meal.

Setting: The study was carried out in an outpatient clinic.

Patients and Other Participants: Nineteen overweight (body mass index 32.1 ± 0.9 kg/m²) men participated.

Interventions: Liquid preloads (1 MJ) contained whey (55 g), casein (55 g), lactose (56 g), or glucose (56 g).

Main Outcome Measures: Plasma ghrelin, cholecystokinin (CCK), insulin, glucose and amino acids, gastric emptying rate (plasma paracetamol), appetite rating (visual analog scale), and ad libitum energy intake were the main outcome measures.

Results: Energy intake was 10 ± 3% higher after the glucose preload compared with lactose and protein preloads (P < 0.05), which were predicted by ghrelin at 120 min (P < 0.05). CCK was 71 ± 6% higher 90 min after the protein preloads compared with glucose and lactose (P < 0.05), which predicted appetite at 180 min (P < 0.05). There was a small increase in branched chain amino acids after the whey preload compared with casein (P < 0.01), but this was independent of appetite and energy intake.

Conclusion: Acute appetite and energy intake are equally reduced after consumption of lactose, casein, or whey compared with glucose, which was consistent with differences in plasma ghrelin. Higher CCK responses after proteins correlated with satiety but did not affect energy intake.

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