The Effect of Low or High Dietary Fiber Diet on Volatile Organic Compounds in Exhaled Breath of Healthy Individuals (FIBRE-MATCH)
Characterization of Fiber-degrading Microbiota in Individuals Without Gastrointestinal Diseases
The aim of this crossover intervention study is to evaluate the volatile organic compounds (VOCs) present in participants at baseline and how these levels change after consuming either a low- or high-dietary fiber diet for three days. This study will involve adults, 18-65 years old, without any gastrointestinal diseases.
The primary objectives are to characterize baseline VOC profiles, assess changes in these profiles after a short-term dietary fiber intervention, determine if specific VOC patterns correlate with dietary fiber intake, and identify the time points at which VOC levels peak. This information will help establish the optimal timing for breath sampling and potentially provide insight into how VOC patterns relate to dietary fiber consumption and degradation.
The expected outcome is that a high-dietary fiber diet will produce a VOC profile enriched in metabolites associated with fiber fermentation compared to a low-dietary fiber diet, and that these VOCs will be consistent with those identified in vitro during fecal fermentation. Each participant will serve as an internal control, enabling within-subject comparisons of VOC levels at baseline and following the dietary fiber intervention.
Participants will receive a whole-food product that is rich in dietary fiber and will consume either a low-fiber diet (10 g/day) or a high-fiber diet (40 g/day) for three days. On the first day of each intervention, participants will also ingest a pH capsule to monitor gastrointestinal pH continuously throughout the three days. After a three-week washout period, participants will cross over to the other intervention arm and undergo another round of gastrointestinal pH monitoring.
In addition to the dietary intervention, participants will complete food and health questionnaires to assess habitual fiber intake and dietary habits. Fecal samples will be collected for in vitro fermentation to functionally profile the gut microbiota by assessing fecal VOCs, short-chain fatty acids (SCFA), and the microbial enzymatic activity and its pH-dependent modulation.
調査の概要
研究の種類
入学 (推定)
段階
- 適用できない
連絡先と場所
研究連絡先
- 名前：Natalie Sundberg PhD Student
- 電話番号：+46 704670585
- メール：natalie.sundberg@oru.se
研究連絡先のバックアップ
- 名前：Robert Brummer, Professor
- 電話番号：+46 738426600
- メール：Robert.Brummer@oru.se
研究場所
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Örebro、スウェーデン
- 募集
- Örebro university
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コンタクト：
- Natalie Sundberg
- メール：fibrematch@oru.se
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-
参加基準
適格基準
就学可能な年齢
- 大人
- 高齢者
健康ボランティアの受け入れ
説明
Inclusion Criteria:
- Signed informed consent obtained prior to any study-related procedures.
- Willingness to refrain from regular consumption of prebiotic or probiotic products, as well as medications known to affect gastrointestinal function, for at least four weeks prior to the study visits.
Exclusion Criteria:
- History of complicated gastrointestinal surgery.
- Presence of a gastrointestinal diagnosis or any condition that, in the opinion of the principal investigator, may influence the study outcomes.
- Current diagnosis of a psychiatric disorder.
- Systemic use of antibiotics or steroid medications within the past 3 months.
- Frequent use of NSAIDs (non-steroidal anti-inflammatory drugs) within the 2 months preceding the study visit.
- Regular consumption of prebiotic or probiotic products within the past 4 weeks.
- Alcohol or substance abuse.
- Current smoking or use of nicotine pouches.
- Frequent use of laxatives, antidiarrheal agents, or anticholinergic medications within the 12 weeks preceding the study visit.
- Pregnancy or breastfeeding.
- Respiratory disease or infection.
研究計画
研究はどのように設計されていますか？
デザインの詳細
- 主な目的：基礎科学
- 割り当て：ランダム化
- 介入モデル：クロスオーバー割り当て
- マスキング：ダブル
武器と介入
参加者グループ / アーム |
介入・治療 |
|---|---|
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実験的：Low Fiber Diet, Then High Fiber Diet
Participants will receive a whole food dietary fiber product to consume 10g of dietary fiber per day over a total of 3 days, equal to a high fiber diet.
After a washout period of 3 weeks, they then receive the same whole food dietary fiber product, to consume 40g of dietary fiber per day in a total of 3 days, equal to a high fiber diet.
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Dietary Intervention: Low Fiber Diet Whole food dietary fiber product, 10g of dietary fiber consumed per day for 3 days Dietary Intervention: High Fiber Diet Whole food dietary fiber product, 40g of dietary fiber consumed per day for 3 days |
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実験的：High Fiber Diet, Then Low Fiber Diet
Participants will receive a whole food dietary fiber product to consume 40g of dietary fiber per day over a total of 3 days, equal to a high fiber diet.
After a washout period of 3 weeks, they then receive the same whole food dietary fiber product, to consume 10g of dietary fiber per day in a total of 3 days, equal to a high fiber diet.
|
Dietary Intervention: High Fiber Diet Whole food dietary fiber product, 40g of dietary fiber consumed per day for 3 days Dietary Intervention: Low Fiber Diet Whole food dietary fiber product, 10g of dietary fiber consumed per day for 3 days |
この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Effect of a 3-day low fiber diet compared to a 3-day high fiber diet on the Volatile Organic Compound profiles in exhaled breath
時間枠：5 weeks
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Volatile Organic Compound profiles in produced by the 3-day low fiber diet intervention compared to the profiles produced by the 3-day high fiber diet, with a 3-week washout inbetween
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5 weeks
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Effect of a low fiber diet on Volatile Organic Compound profiles after 4 hours
時間枠：4 hours
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Volatile organic compound profiles 4 hours after the start of the low fiber diet intervention compared with baseline (0 hours)
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4 hours
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Effect of a low fiber diet on Volatile Organic Compound profiles after 6 hours
時間枠：6 hours
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Volatile organic compound profiles 6 hours after the start of the low fiber diet intervention compared with baseline (0 hours)
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6 hours
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Effect of a low fiber diet on Volatile Organic Compound profiles after 8 hours
時間枠：8 hours
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Volatile organic compound profiles 8 hours after the start of the low fiber diet intervention compared with baseline (0 hours)
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8 hours
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Effect of a high fiber diet on Volatile Organic Compound profiles after 4 hours
時間枠：4 hours
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Volatile organic compound profiles 4 hours after the start of the high fiber diet intervention compared with baseline (0 hours)
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4 hours
|
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Effect of a high fiber diet on Volatile Organic Compound profiles after 6 hours
時間枠：6 hours
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Volatile organic compound profiles 6 hours after the start of the high fiber diet intervention compared with baseline (0 hours)
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6 hours
|
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Effect of a high fiber diet on Volatile Organic Compound profiles after 8 hours
時間枠：8 hours
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Volatile organic compound profiles 8 hours after the start of the high fiber diet intervention compared with baseline (0 hours)
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8 hours
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Gastrointestinal pH after a 3-day low fiber diet
時間枠：5 weeks
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Assessment of Gastrointestinal pH measured by the alpHaONE JSPC-1 pH capsule, after a 3-day low fiber diet
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5 weeks
|
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Gastrointestinal pH after a 3-day high fiber diet
時間枠：5 weeks
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Assessment of Gastrointestinal pH measured by the alpHaONE JSPC-1 pH capsule, after a 3-day high fiber diet
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5 weeks
|
その他の成果指標
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Fecal Volatile Organic Compound profiles
時間枠：1 week
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Changes in fecal Volatile Organic Compound profiles produced during fecal fermentation, comparison of baseline (0 hours) profiles with profiles at 24 hours
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1 week
|
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SCFA
時間枠：1 Week
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Changes in SCFA levels produced during fecal fermentation, comparison of baseline (0 hours) levels with levels at 24 hours
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1 Week
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Microbial enzymatic activity
時間枠：1 week
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Changes in microbial enzymatic activity during fecal fermentation, comparison of baseline (0 hours) activity with activity at 24 hours
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1 week
|
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Microbiota composition
時間枠：1 week
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Microbiota composition at baseline (0 hours) compared with composition at 24 hours
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1 week
|
協力者と研究者
捜査官
- スタディディレクター：Robert Brummer, Professor、Örebro University, Sweden
研究記録日
主要日程の研究
研究開始 (推定)
一次修了 (推定)
研究の完了 (推定)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (実際)
学習記録の更新
投稿された最後の更新 (実際)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
本研究に関する用語
キーワード
その他の研究ID番号
- 2026-00408-01
- 101161484 (その他の助成金/資金番号：European Innovation Council (EIC))
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