How Differences in the Composition of Microorganisms in the Soil Affect the Microorganisms in the Human Gut, Through the Vegetables That Grow in it: a Process Pilot Study With Healthy Participants (HUMANITAS)
2026年7月29日 更新者：Pieter Maljaars、Leiden University Medical Center
The Effect of Soil Biodiversity on Human Gut Microbiome: a Process Pilot Study (The HUMANITAS Study)
There are two objectives for this clinical trial.
The first is to test whether, with the current logistics and study setup it is possible to perform the study well and see where there might be bottlenecks we couldn't predict.
The second objective is to investigate the relation between the composition of the microorganisms in the soil, the crops that grow in that soil, and the human gut.
During the study participants will drink three vegetable smoothies a day, for two periods of one week.
The only difference between the two periods is whether the vegetables come from a farm with a low diversity of microorganisms in the soil or a high diversity.
Participants will be asked to give blood samples and turn in fecal samples before and after each period.
研究概览
详细说明
This randomized, double-blind, crossover pilot study will be used to assess the feasibility of logistics including vegetable delivery and preparation of the intervention product by the participants themselves. Besides feasibility, we will aim to identify live bacteria and fungi present in the intervention product (smoothies) and trace these back in stool samples.
The gut microbiome is also called the "second genome" to which many protective and life-supporting functions have been externalized. It orchestrates the crosstalk between our own cells and environmental metagenome. Diet and food choices can modulate gut microbiome species and functional diversity, but the mechanisms by which this occurs are unclear. The nutritional quality of crops, the crop microbiome and the soil microbiome may therefore all be involved.
Ten participants will be randomized in a cross-over design, with each participant drinking three 150 mL vegetable smoothies per day for two separate intervention weeks (HiDi vs LoDi soil origin, randomized 1 : 1). During the first week, smoothies will be prepared with the vegetables derived from microbiome-enriched soil (HiDi) or microbiome-impoverished soil (LoDi). Vegetables, a blender, and detailed instructions to prepare the smoothies on-site will be delivered to the participant. Each participant is asked to keep a diary (in the form of a daily Castor questionnaire), with special attention to dietary habits and intake. Furthermore, before and after this specified diet week, blood and stool samples will be collected. After a washout period of two weeks, participants will be offered identical meals in a crossover design.
研究类型
介入性
注册 (估计的)
10
阶段
- 不适用
联系人和位置
本节提供了进行研究的人员的详细联系信息，以及有关进行该研究的地点的信息。
学习联系方式
- 姓名：Jeroen Maljaars, MD, PhD
- 电话号码：+31 71 526 3575
- 邮箱：P.W.J.Maljaars@lumc.nl
研究联系人备份
- 姓名：Maarten Tushuizen, MD, PhD
- 电话号码：+31 71 526 9111
- 邮箱：M.E.Tushuizen@lumc.nl
学习地点
-
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South Holland
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Leiden、South Holland、荷兰、2333ZA
- Leids Universitair Medisch Centrum
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接触：
- Jeroen Maljaars, MD, PhD
- 电话号码：+31 71 526 9111
- 邮箱：P.W.J.Maljaars@lumc.nl
-
首席研究员：
- Jeroen Maljaars, MD, PhD
-
-
参与标准
研究人员寻找符合特定描述的人，称为资格标准。这些标准的一些例子是一个人的一般健康状况或先前的治疗。
资格标准
适合学习的年龄
- 成人
- 年长者
接受健康志愿者
是的
描述
Inclusion Criteria:
- Aged 18 to 70 years
- Written informed consent
- Inhabitant of Leiden
Exclusion Criteria:
- Any documented causes of chronic disease
- Suspicion of or present excessive alcohol use defined as >2 units/day (>14/week)
- Recent use (<3 months) of antibiotics
- Any known food allergy or restriction, or following a vegan/vegetarian diet
- Use of possible drugs interfering microbiota or recent (< 3 months) changes in dosages
- A psychiatric, addictive or any other disorder that compromises the participants ability to understand the study content and to give written informed consent for participation in the study
学习计划
本节提供研究计划的详细信息，包括研究的设计方式和研究的衡量标准。
研究是如何设计的？
设计细节
- 主要用途：预防
- 分配：随机化
- 介入模型：交叉作业
- 屏蔽：三倍
武器和干预
参与者组/臂 |
干预/治疗 |
|---|---|
|
有源比较器：Crops derived from Low followed by High diversity soil
Participants will be given vegetables, originating from low- or high-microbial diversity soil, to prepare smoothies with.
In this arm participants start with vegetables from a low diversity soil, after a washout period of two weeks they will receive vegetables from a high diversity soil.
|
Vegetable smoothie prepared with crops grown in low-microbial diversity soil
Vegetable smoothie prepared with crops grown in high-microbial diversity soil
|
|
有源比较器：Crops derived from High followed by Low diversity soil
Participants will be given vegetables, originating from low- or high-microbial diversity soil, to prepare smoothies with.
In this arm participants start with vegetables from a high diversity soil, after a washout period of two weeks they will receive vegetables from a low diversity soil.
|
Vegetable smoothie prepared with crops grown in low-microbial diversity soil
Vegetable smoothie prepared with crops grown in high-microbial diversity soil
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研究衡量的是什么？
主要结果指标
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
|
Feasibility of logistics of the study protocol: Deliveries
大体时间：From start enrollment to the end of treatment at 4 weeks
|
The percentage of successful deliveries to the participants in the pre-agreed time window.
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From start enrollment to the end of treatment at 4 weeks
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Feasibility of logistics of the study protocol: Preparation of the intervention product
大体时间：From the start of the treatment period until the end at 4 weeks
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Using the Daily diary (Castor questionnaire), successful preparation of the intervention product is assessed.
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From the start of the treatment period until the end at 4 weeks
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Feasibility of logistics of the study protocol: Recruitment rate
大体时间：From the start of recruitment until the start of the study
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Number of recruited participants per month until the start of the study.
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From the start of recruitment until the start of the study
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Tracing back life microorganisms from the smoothie in stool samples
大体时间：Day 1, Day 7, Day 22, and Day 28
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Life bacteria present in the smoothies will be cultured and sequenced to then compare to feces samples of participants
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Day 1, Day 7, Day 22, and Day 28
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次要结果测量
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
|
Participant compliance to the study protocol
大体时间：From start enrolment until the end of treatment at the end of 4 weeks
|
Compliance with the protocol will be assessed through the daily lifestyle diary (in the form of a Castor questionnaire).
Which will capture the number of consumed smoothies (≥95.2%) and number of consumed smoothies at the correct time window (≥80%).
As well whether the duration and time of exercise (≥80%), duration and time of nighttime sleeping period (≥80%), timing and content of main meals (≥80%) between the two periods are comparable.
For each of the parameters the compliance threshold is indicated above.
Based on these parameters we will get a percentage of participants that were compliant.
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From start enrolment until the end of treatment at the end of 4 weeks
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Shifts in gut microbiome composition
大体时间：Baseline, Day 8, Day 21, and Day 29
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Metagenomics will be performed on feces samples from participants to get an compositional view of the gut microbiome.
Samples will be taken at baseline, Day 8, Day 21, and Day 29
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Baseline, Day 8, Day 21, and Day 29
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Sample completeness
大体时间：From start of treatment to the end of treatment at 4 weeks
|
percentage of complete sampling sets
|
From start of treatment to the end of treatment at 4 weeks
|
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Asses willingness of participants to create their own intervention product
大体时间：From start treatment to end of treatment at 4 weeks
|
Using the Daily diary (Castor questionnaire), the participants are required to fill in their opinion on creating their own intervention product on a daily basis.
This is measured on a 10 point scale, with 1 being equal to never wanting to do it again and 10 being equal to enjoying it.
There is also an optional open question where participants can justify their answer.
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From start treatment to end of treatment at 4 weeks
|
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Differences in phytonutrient levels in serum
大体时间：Baseline, Day 8, Day 21, and Day 29
|
After confirmation of significant changes in gut microbiome composition, phytonutrient levels will be measured in serum.
Serum will be collected at Baseline, Day 8, Day 21, and Day 29
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Baseline, Day 8, Day 21, and Day 29
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合作者和调查者
在这里您可以找到参与这项研究的人员和组织。
出版物和有用的链接
负责输入研究信息的人员自愿提供这些出版物。这些可能与研究有关。
一般刊物
- David LA, Maurice CF, Carmody RN, Gootenberg DB, Button JE, Wolfe BE, Ling AV, Devlin AS, Varma Y, Fischbach MA, Biddinger SB, Dutton RJ, Turnbaugh PJ. Diet rapidly and reproducibly alters the human gut microbiome. Nature. 2014 Jan 23;505(7484):559-63. doi: 10.1038/nature12820. Epub 2013 Dec 11.
- Albenberg LG, Wu GD. Diet and the intestinal microbiome: associations, functions, and implications for health and disease. Gastroenterology. 2014 May;146(6):1564-72. doi: 10.1053/j.gastro.2014.01.058. Epub 2014 Feb 4.
- Henao-Mejia J, Elinav E, Jin C, Hao L, Mehal WZ, Strowig T, Thaiss CA, Kau AL, Eisenbarth SC, Jurczak MJ, Camporez JP, Shulman GI, Gordon JI, Hoffman HM, Flavell RA. Inflammasome-mediated dysbiosis regulates progression of NAFLD and obesity. Nature. 2012 Feb 1;482(7384):179-85. doi: 10.1038/nature10809.
- Clemente JC, Ursell LK, Parfrey LW, Knight R. The impact of the gut microbiota on human health: an integrative view. Cell. 2012 Mar 16;148(6):1258-70. doi: 10.1016/j.cell.2012.01.035.
- Turnbaugh PJ, Backhed F, Fulton L, Gordon JI. Diet-induced obesity is linked to marked but reversible alterations in the mouse distal gut microbiome. Cell Host Microbe. 2008 Apr 17;3(4):213-23. doi: 10.1016/j.chom.2008.02.015.
- Julious, S.A. (2005), Sample size of 12 per group rule of thumb for a pilot study. Pharmaceut. Statist., 4: 287-291. https://doi.org/10.1002/pst.185
- Sanna S, van Zuydam NR, Mahajan A, Kurilshikov A, Vich Vila A, Vosa U, Mujagic Z, Masclee AAM, Jonkers DMAE, Oosting M, Joosten LAB, Netea MG, Franke L, Zhernakova A, Fu J, Wijmenga C, McCarthy MI. Causal relationships among the gut microbiome, short-chain fatty acids and metabolic diseases. Nat Genet. 2019 Apr;51(4):600-605. doi: 10.1038/s41588-019-0350-x. Epub 2019 Feb 18.
- Hirt H. Healthy soils for healthy plants for healthy humans: How beneficial microbes in the soil, food and gut are interconnected and how agriculture can contribute to human health. EMBO Rep. 2020 Aug 5;21(8):e51069. doi: 10.15252/embr.202051069. Epub 2020 Jul 31.
- Blum WEH, Zechmeister-Boltenstern S, Keiblinger KM. Does Soil Contribute to the Human Gut Microbiome? Microorganisms. 2019 Aug 23;7(9):287. doi: 10.3390/microorganisms7090287.
- Fierer N. Embracing the unknown: disentangling the complexities of the soil microbiome. Nat Rev Microbiol. 2017 Oct;15(10):579-590. doi: 10.1038/nrmicro.2017.87. Epub 2017 Aug 21.
- Leeming ER, Louca P, Gibson R, Menni C, Spector TD, Le Roy CI. The complexities of the diet-microbiome relationship: advances and perspectives. Genome Med. 2021 Jan 20;13(1):10. doi: 10.1186/s13073-020-00813-7.
- Johnson AJ, Zheng JJ, Kang JW, Saboe A, Knights D, Zivkovic AM. A Guide to Diet-Microbiome Study Design. Front Nutr. 2020 Jun 12;7:79. doi: 10.3389/fnut.2020.00079. eCollection 2020.
研究记录日期
这些日期跟踪向 ClinicalTrials.gov 提交研究记录和摘要结果的进度。研究记录和报告的结果由国家医学图书馆 (NLM) 审查，以确保它们在发布到公共网站之前符合特定的质量控制标准。
研究主要日期
学习开始 (估计的)
2026年8月1日
初级完成 (估计的)
2026年9月1日
研究完成 (估计的)
2026年9月1日
研究注册日期
首次提交
2026年7月16日
首先提交符合 QC 标准的
2026年7月29日
首次发布 (实际的)
2026年8月3日
研究记录更新
最后更新发布 (实际的)
2026年8月3日
上次提交的符合 QC 标准的更新
2026年7月29日
最后验证
2026年7月1日
更多信息
与本研究相关的术语
关键字
其他研究编号
- NL-010026
计划个人参与者数据 (IPD)
计划共享个人参与者数据 (IPD)？
是的
IPD 计划说明
Metagenomic sequencing data from feces and pythonutrient levels in serum (if available)
IPD 共享时间框架
Beginning 1 month after publication with no end date
IPD 共享支持信息类型
- 研究方案
- 分析代码
药物和器械信息、研究文件
研究美国 FDA 监管的药品
不
研究美国 FDA 监管的设备产品
不
此信息直接从 clinicaltrials.gov 网站检索，没有任何更改。如果您有任何更改、删除或更新研究详细信息的请求，请联系 register@clinicaltrials.gov. clinicaltrials.gov 上实施更改，我们的网站上也会自动更新.