The Effects of Agro-ecological Farming Systems on Human Health

Inflammatory Response Clinical Trial

— AGROHEALTH  

Official title:

The Effects of Agro-ecological Farming Systems on Human Health -- A Randomized Controlled Trial of Agro-ecologically vs Conventionally Produced Foods on Human Health Biomarkers

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT05575258
• Other study ID #: 12519
• Status: Recruiting
• Phase: N/A
• Start date: August 1, 2022
• Est. completion date: March 15, 2025

Study information

• Verified date: December 2022
• Source: Utah State University
• Contact: Stephan van Vliet, PhD
• Phone: 435-797-5369
• Email: stephan.vanvliet[@]usu.edu
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

As concerns regarding the effects of agriculture on human and environmental health mount, a growing number of farmers are seeking ways to improve health from the ground up. A promising way by which a growing number of farmers are seeking to improve environmental health is by using agro-ecological practices (i.e., farming more closely in harmony with natural systems), which include practices such as multi-cropping, ley rotations, and/or integrated crop-livestock systems. Despite potential ecological benefits, there is a lack of critical knowledge if consuming foods from agro-ecological systems impacts biomarkers of human health, including inflammatory and metabolomics profiles. The purpose of this project is to test the hypothesis that consuming foods produced using agro-ecological practices improves biomarkers of consumer health compared to consuming similar foods from conventional (monoculture) agriculture. All diets will be matched one-to-one in terms of macronutrients and food sources.

Description:

This work will utilize a randomized cross-over design to compare an agroecological vs conventional sourced diet, and determine their effects on inflammation and cardio metabolic health signatures in middle-aged adults (35-60 y old). Diets will be isocaloric and matched for macronutrient content, and consumed for 44 days each with a 14-day washout (habitual diet) period in between. Blood, urine, and stool samples will be obtained before and after the dietary interventions, in addition to data about physical activity and questionnaires regarding quality of life.

STUDY OBJECTIVES

1. To determine the effects on plasma inflammatory markers (IL-6, TNF-α, C-reactive protein) in response to each intervention.

2. To determine effects on urinary and plasma metabolites (vitamin and mineral derivatives, polyphenols, amino acids, glucose metabolites etc.) to provide insight into metabolic health pathways in response to each intervention.

3. To determine effects on gut microbiota communities (alpha and beta diversity, and short-chain fatty acid producing bacteria) in response to each intervention.

INTERVENTION

After completing all baseline testing, participants will be randomized to one of the two starting diets (agroecological or conventional, for 44 days with a 14 day washout period until they start their second diet (agroecological or conventional depending on the starting diet). In accordance with established protocols, a research dietitian will provide weight-maintenance diets based on each individual's daily energy requirement (Harris-Benedict equation). All foods that participants consume during those 44 days will be provided by the Metabolic Kitchen at NDFS, and dietitian-led group classes and handouts with food preparation instructions will be provided to the participants to ensure compliance. The diets will be provided as 4-day rotating menus and participants will be asked to pick-up food twice weekly at the NDFS building. This will allow the research time to interact face-to-face with the participant, address any issues, and further ensure compliance. All subjects assigned to the same diet will receive identical meals and snacks, but portion sizes will be determined based on the previously mentioned daily energy requirement. Food for the agroecological diet will be sourced predominantly from the Greenacres farm (Cincinnati, OH) and/or other producers that use documented agro-ecological principles (e.g., Regenerative Organic Certified). Food for the conventional diet will be sourced from local grocery stores in Logan, UT (non-organic produce). All foods will be stored in food-grade fridges and freezers in the CHNS Metabolic Kitchen and food boxes will be prepared weekly by staff.

Examples of Meals

Breakfast Whole milk, eggs, oatmeal, and blueberries

Snack Rice cakes

Lunch Ground beef, tomato salad and cherries

Snack Apple with nut butter

Dinner Grilled chicken with rice and steamed broccoli

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 40
• Est. completion date: March 15, 2025
• Est. primary completion date: December 15, 2024
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 35 Years to 60 Years

Eligibility

Inclusion Criteria:

• Age =35 and =60 years

• BMI =25 and =35kg/m2

• Weight stable in last 3 months (loss or gain <4%)

• Hemoglobin A1C (HbA1C =6.4%)

• Fasting plasma glucose concentration <126mg/dl

• For the safety of the participant and proper consent of the procedures, subjects must be able to speak and understand English to participate in this study

• Stable medication/supplement use for 3 months prior to study

Exclusion Criteria:

• Use of medications that are known to affect the study outcome measures (e.g., NSAIDs, corticosteroids) or increase the risk of study procedures (e.g., anticoagulants) that cannot be temporarily discontinued for this study

• Strict dietary patterns (e.g., vegan, keto)

• Consuming >14 alcoholic drinks per week

• Use of cigarettes (or other tobacco products) in last 3 months

• Engaged in high level of competitive exercise (e.g., iron man, marathons, powerlifting)

• Diagnoses of active malignancy, congestive heart failure, diabetes mellitus or chronic obstructive pulmonary disease

• Any inflammatory diseases(e.g., autoimmune diseases, coeliac disease, glomerulonephritis, hepatitis, inflammatory. bowel disease, arthritis)

• Use of antibiotics in last 60 days

• Pregnant or planning to become pregnant in the next 5 months

• Lactating women

• Persons who are unable or unwilling to follow the study protocol or who, for any reason, the research team considers not an appropriate candidate for this study, including non-compliance with screening appointments or study visits

• Participants that are pregnant or planning on becoming pregnant in the next 5 months are excluded. The justification is the documented alterations in metabolism that occur during pregnancy, which would impact our metabolomics analysis in this study.

Related Conditions & MeSH terms

• Inflammatory Response

Intervention

Other:
• 44-Day Diet Conventionally Sourced - YELLOW Diet
Food for the conventional diet will be sourced from local grocery stores (non-organic produce) around Logan, UT, USA.
• 44-Day Diet Agro-Ecologically Sourced - GREEN Diet
Food for the agro-ecological diet will be sourced predominantly from the Greenacres farm (Cincinnati, OH, USA) and a limited number of other retailers that sell select foods from agro-ecological producers (Seal the Seasons, General Mills, Pecan Shop, Sol Simple).

Locations

Country	Name	City	State
United States	Center for Human Nutrition Studies	Logan	Utah

Sponsors (2)

Lead Sponsor	Collaborator
Utah State University	GreenAcres Foundation

Country where clinical trial is conducted

United States, 

References & Publications (7)

Albizua, A., Williams, A., Hedlund, K. & Pascual, U. Crop rotations including ley and manure can promote ecosystem services in conventional farming systems. Applied Soil Ecology95, 54-61, doi:https://doi.org/10.1016/j.apsoil.2015.06.003(2015).

Galie S, Garcia-Gavilan J, Papandreou C, Camacho-Barcia L, Arcelin P, Palau-Galindo A, Rabassa A, Bullo M. Effects of Mediterranean Diet on plasma metabolites and their relationship with insulin resistance and gut microbiota composition in a crossover randomized clinical trial. Clin Nutr. 2021 Jun;40(6):3798-3806. doi: 10.1016/j.clnu.2021.04.028. Epub 2021 Apr 27. — View Citation

Kronberg SL, Provenza FD, van Vliet S, Young SN. Review: Closing nutrient cycles for animal production - Current and future agroecological and socio-economic issues. Animal. 2021 Dec;15 Suppl 1:100285. doi: 10.1016/j.animal.2021.100285. Epub 2021 Jul 24. — View Citation

Lain KY, Catalano PM. Metabolic changes in pregnancy. Clin Obstet Gynecol. 2007 Dec;50(4):938-48. doi: 10.1097/GRF.0b013e31815a5494. — View Citation

McDaniel MD, Tiemann LK, Grandy AS. Does agricultural crop diversity enhance soil microbial biomass and organic matter dynamics? A meta-analysis. Ecol Appl. 2014 Apr;24(3):560-70. doi: 10.1890/13-0616.1. Erratum In: Ecol Appl. 2022 Sep;32(6):e2683. — View Citation

Meslier V, Laiola M, Roager HM, De Filippis F, Roume H, Quinquis B, Giacco R, Mennella I, Ferracane R, Pons N, Pasolli E, Rivellese A, Dragsted LO, Vitaglione P, Ehrlich SD, Ercolini D. Mediterranean diet intervention in overweight and obese subjects lowers plasma cholesterol and causes changes in the gut microbiome and metabolome independently of energy intake. Gut. 2020 Jul;69(7):1258-1268. doi: 10.1136/gutjnl-2019-320438. Epub 2020 Feb 19. — View Citation

Wezel, A.et al.Agroecological practices for sustainable agriculture. A review. Agronomy for Sustainable Development34, 1-20, doi:10.1007/s13593-013-0180-7 (2014).

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Inflammatory cytokine biomarker (IL-6 and TNF-alpha) concentrations in plasma samples	Inflammatory biomarker concentrations of IL-6 and TNF-alpha (pg/ml) will be measured using ELISA kits at the Center for Human Nutrition Studies at Utah State University. Blood samples will be obtained via phlebotomy at day 44 (post-diet) for each intervention, centrifuged immediately and stored at -80ºC until analyses are performed.	Day 44 (post)
Primary	Inflammatory cytokine biomarker (C-reactive protein) concentrations in plasma samples	Inflammatory biomarker concentrations of C-reactive protein (CRP; ng/ml) will be measured using ELISA kits at the Center for Human Nutrition Studies at Utah State University. Blood samples will be obtained via phlebotomy on day 44 (post-diet) for each intervention, centrifuged immediately and stored at -80ºC until analyses are performed.	Day 44 (post)
Primary	Relative abundance of metabolites in plasma samples using triple quad LC/MS-MS	Relative abundance (arbitrary units) of plasma metabolites after each diet will be measured using high-performance liquid chromatography tandem mass-spectrometry (LC/MS-MS). This analysis allows the simultaneous high-resolution measurement of a broad range of metabolites and will give insight into how food-derived metabolites from the two different diets impact metabolic pathways of human health. Blood samples will be obtained via phlebotomy on day 44 (post-diet) for each intervention, centrifuged immediately and stored at -80ºC until analyses are performed. Multivariate statistical analysis and Partial least squares Discriminant Analysis will be used to identify features change from pre to post on each diet.	Day 44 (post)
Primary	Composition of gut microbiota bacteria using 16s rRNA sequencing	First of the day stool samples will be collected on day 44 (post-diet) for each intervention using DNA Genotek OMR-200 collection kits and stored at -80ºC until analyses are performed. DNA will be extracted from stool samples using a QIAamp Fast DNA Stool Mini Kit following manufacturer's instructions and analyzed for taxonomic assignment using 16s rRNA sequencing. Reported outcomes include individual bacteria and Shannon Index Values.	Day 44 (post)
Secondary	Pittsburgh Sleep Quality Index (PSQI) scores	The PSQI will be used to determine sleep quality. Assessments will be performed on day 44 (post-diet) for each intervention. PSQI yields a total score ranging from 0 to 21 with a higher total score (referred to as global score) indicating worse sleep quality.	Day 44 (post)
Secondary	The Perceived Stress Scale (PSS) scores	PSS evaluates how unpredictable, uncontrollable, and overloaded participants judge their lives. Assessments will be performed on day 44 (post-diet) for each intervention. PSS scores can range from 0 to 40 with higher scores indicating higher perceived stress.	Day 44 (post)
Secondary	Profile of Mood States (POMS) scores	The Profile of Mood States (POMS) 30-item version will determine mood changes using the following domains: Tension-Anxiety, Depression-Dejection, Anger-Hostility, Vigor-Activity, Fatigue-Inertia and Confusion-Bewilderment. Assessments will be performed on day 44 (post-diet) for each intervention. This will give a value between -24 and 177, with lower scores indicative of people with more stable mood profiles.	Day 44 (post)
Secondary	Short Form Healthy Survey (SF-36) scores	The SF-36 will be used to assess quality of life using physical (functioning, role-physical, pain, general health) and mental domains (vitality, social functioning, role-emotional, and mental health). Assessments will be performed on day 44 (post-diet) for each intervention. The SF-36 scores on a range from 0-100 with higher scores indicating better physical and mental health.	Day 44 (post)

External Links

•   Center for Human Nutrition Studies - USU
•   Google Scholar - Stephan van Vliet