Pooled-data analysis identifies pyloric pressures and plasma cholecystokinin concentrations as major determinants of acute energy intake in healthy, lean men.
BACKGROUND
The interaction of nutrients with the small intestine modulates gastropyloroduodenal motility, stimulates the release of gut hormones, and suppresses appetite and energy intake.


OBJECTIVE
We evaluated which, if any, of these variables are independent determinants of acute energy intake in healthy, lean men.


METHODS
We pooled data from 8 published studies that involved a total of 67 healthy, lean men in whom antropyloroduodenal pressures, gastrointestinal hormones, and perceptions were measured during intraduodenal nutrient or intravenous hormone infusions. In all of the studies, the energy intake at a buffet lunch was quantified immediately after the infusions. To select specific motor, hormone, or perception variables for inclusion in a multivariable mixed-effects model for determination of independent predictors of energy intake, we assessed all variables for collinearity and determined within-subject correlations between energy intake and these variables by using bivariate analyses adjusted for repeated measures.


RESULTS
Although correlations were shown between energy intake and antropyloroduodenal pressures, plasma hormone concentrations, and gastrointestinal perceptions, only the peak number of isolated pyloric-pressure waves, peak plasma cholecystokinin concentration, and area under the curve of nausea were identified as independent predictors of energy intake (all P < 0.05), so that increases of 1 pressure wave, 1 pmol/L, and 1 mm . min were associated with reductions in energy intake of approximately 36, approximately 88, and approximately 0.4, respectively.


CONCLUSIONS
We identified specific changes in gastrointestinal motor and hormone functions (ie, stimulation of pyloric pressures and plasma cholecystokinin) and nausea that are associated with the suppression of acute energy intake.
Seimon
Radhika V
RV
University of Adelaide, Discipline of Medicine, Adelaide, South Australia Australia.
Lange
Kylie
K
Little
Tanya J
TJ
Brennan
Ixchel M
IM
Pilichiewicz
Amelia N
AN
Feltrin
Kate L
KL
Smeets
Astrid J
AJ
Horowitz
Michael
M
Feinle-Bisset
Christine
C
D000328:Adult; D001066:Appetite / Q000502:physiology*; D015992:Body Mass Index; D002766:Cholecystokinin / Q000097:blood*; D004386:Duodenum / Q000502:physiology; D002149:Energy Intake / Q000502:physiology*; D052216:Glucagon-Like Peptide 1 / Q000097:blood; D006801:Humans; D006815:Hunger; D008297:Male; D009325:Nausea / Q000453:epidemiology / Q000503:physiopathology; D010465:Perception; D011237:Predictive Value of Tests; D011312:Pressure; D011706:Pyloric Antrum / Q000502:physiology; D011708:Pylorus / Q000502:physiology*; D012016:Reference Values; D055815:Young Adult
D052216:Glucagon-Like Peptide 1; D002766:Cholecystokinin