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Acute tryptophan depletion slows gastric emptying in females

Published online by Cambridge University Press:  09 March 2007

Michiel A. van Nieuwenhoven*
Affiliation:
Department of Gastroenterology, University Hospital Maastricht, Maastricht, The Netherlands
Sabine D. M. Valks
Affiliation:
Department of Gastroenterology, University Hospital Maastricht, Maastricht, The Netherlands
Sjacko Sobczak
Affiliation:
Department of Psychiatry and Neuropsychology, University Hospital Maastricht, Maastricht, The Netherlands
Willem J. Riedel
Affiliation:
Department of Psychiatry and Neuropsychology, University Hospital Maastricht, Maastricht, The Netherlands
Robert-Jan M. Brummer
Affiliation:
Department of Gastroenterology, University Hospital Maastricht, Maastricht, The Netherlands
*
*Corresponding author: Dr M. A. van Nieuwenhoven, fax +31 43 3875006, email M.vannieuwenhoven@HB.UNIMAAS.NL
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Abstract

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Serotonin (5-HT) is an important neurotransmitter involved in the brain–gut axis. It is possible to lower the 5-HT level in the body by means of a nutritional intervention using an amino acid mixture; the acute tryptophan depletion (ATD) method. We studied the effect of ATD on gastric emptying in healthy females, who received both ATD and placebo in a random order. Gastric emptying was measured using the [13C]octanoic acid breath test. The present data demonstrate significant differences in both gastric emptying and lag phase (Tlag) between the ATD and placebo experiment. Eight out of ten subjects showed a delayed gastric emptying in the ATD experiment. Both the gastric half-emptying time (T1/2) and the Tlag were significantly higher in the ATD experiment. T1/2 in the ATD experiment was 137·2 (range 76·2–634·8) min; T1/2 for the placebo experiment was 98·5 (range 63·7–168·8) min (P=0·028). Tlag in the ATD experiment was 83·7 (range 45·1–356·2) min; Tlag for the placebo experiment was 56·9 (range 23·2–101·2) min (P=0·007). We conclude that lowering the 5-HT level in the body using the ATD method leads to a significantly delayed gastric emptying of a solid meal. Nutritional manipulation of the serotonergic system in healthy volunteers may lead to alterations in gastrointestinal motility.

Type
Research Article
Copyright
Copyright © The Nutrition Society 2004

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