DietGERD: Dietary Carbohydrate and GERD in Veterans
Study Details
Study Description
Brief Summary
4-Arm Diet Intervention Investigating Effects of Dietary Carbohydrate Type and Amount on gastroesophageal pH, gastroesophageal reflux disease (GERD) symptoms and medication use.
Condition or Disease | Intervention/Treatment | Phase |
---|---|---|
|
N/A |
Detailed Description
delayed due to COVID related research shutdown
Specific Hypothesis: The preliminary findings suggest a physiological mechanism between dietary intake and GERD that may be related to type of dietary carbohydrate intake (complex vs simple carbohydrate). The investigators hypothesize that modifying the type of dietary carbohydrate consumed - by reducing the proportion of simple carbohydrate (sugars) consumed - will reduce or resolve GERD symptoms and medication use in obese Veterans with chronic GERD. The investigators further hypothesize that the mechanistic effects of reducing simple carbohydrate intake is related to either: a) improved dietary fiber intake and/or glycemic load, and thus, reduced amount and duration of esophageal acid exposure; and/or b) improved insulin sensitivity which would positively influence the function of key gastrointestinal hormones (ie, gastrin, glucagon, GLP-1, ghrelin11) that regulate gastric motility and/or lower esophageal sphincter function.
Aim 1: To determine effects of dietary carbohydrate consumed (amount and type) on percent time with esophageal pH < 4.0, as well as number of reflux episodes, GERD symptoms and GERD medication use, in 200 obese Veterans who have chronic high frequency of GERD symptoms. To meet this aim the investigators will use a randomized controlled trial in which the investigators manipulate amount of total and simple dietary carbohydrate intake for duration of 9 weeks.
Aim 2: To assess associations between GERD resolution variables and factors related to potential mechanisms by which modifying dietary carbohydrate intake could resolve/reduce GERD in obese Veterans.
2a: The investigators will investigate associations related to whether the effect is nutritionally mediated by measuring change in dietary fiber load and dietary glycemic load, and thus, whether these changes are related to improved gastric acid secretion (% time pH < 4), gastric motility, and/or the other parameters that comprise the Johnson-DeMeester score.
2b: The investigators will also investigate whether effects are associated with changes in the hormonal milieu by measuring hormonal response of gastrin, glucagon, glucagon-like peptide-1 (GLP-1), ghrelin and insulin, which could potentially influence gastric acid secretion, gastric motility and/or lower esophageal sphincter function.
Study Design
Arms and Interventions
Arm | Intervention/Treatment |
---|---|
Active Comparator: HTHS High total carbohydrate with high total simple carbohydrate diet |
Other: Dietary Carbohydrate
9 week menu of dietary carbohydrate modification
|
Experimental: HTLS High total carbohydrate with low total simple carbohydrate diet |
Other: Dietary Carbohydrate
9 week menu of dietary carbohydrate modification
|
Experimental: LTHS Low total carbohydrate with low total simple carbohydrate diet |
Other: Dietary Carbohydrate
9 week menu of dietary carbohydrate modification
|
Experimental: LTLS Low total carbohydrate with low total simple carbohydrate diet |
Other: Dietary Carbohydrate
9 week menu of dietary carbohydrate modification
|
Outcome Measures
Primary Outcome Measures
- Gastroesophageal pH [24 hours]
ambulatory ph monitoring for gastroesophageal ph, number and frequency of reflux episodes
Secondary Outcome Measures
- GERD symptoms [9 weeks]
GERD symptoms measured weekly for 9 weeks using Gastroesophageal Reflux Disease Symptom Assessment Scale (GSAS)
- GERD medication use [9 weeks]
Weekly measure of type, amount and dose of GERD medication use
- GERD symptoms [9 weeks]
GERD symptoms measured weekly for 9 weeks using Gastroesophageal Reflux Disease Questionnaire (GERDQ)
Other Outcome Measures
- Gastric hormones [24 hour period]
Plasma/serum measure of glucose, insulin, gastrin, glucagon, active ghrelin and active GLP-1
Eligibility Criteria
Criteria
Inclusion Criteria:
Age 21 or over BMI 30-39.9 GERD
Exclusion Criteria:
-
History of type 1 diabetes
-
Hernia or strictures
-
Gastroparesis
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Extra-esophageal GERD
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Barrett's esophagus or Esophageal adenocarcinoma
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History of gastric or bariatric or esophageal surgery, radiation or cancer
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History of gastrointestinal malabsorption
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Alcohol averaging > 2 drinks per day during past 3 months
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Pregnancy / Lactation
Contacts and Locations
Locations
Site | City | State | Country | Postal Code | |
---|---|---|---|---|---|
1 | Tennessee Valley Healthcare System Nashville Campus, Nashville, TN | Nashville | Tennessee | United States | 37212-2637 |
Sponsors and Collaborators
- VA Office of Research and Development
Investigators
- Principal Investigator: Kevin D Niswender, MD PhD, Tennessee Valley Healthcare System Nashville Campus, Nashville, TN
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- CLNB-006-14S