Clinical trial NCT03940300: Farming for Life - Health Impact of Organic Vegetable Prescriptions for Adults Living With or at Risk of Type 2 Diabetes
Official title: Farming for Life - a Program to Prescribe Fresh Organic Vegetables for Adults Living With or at Risk of Type 2 Diabetes.
Study type: INTERVENTIONAL
Overall status: TERMINATED
Phase: NA
Conditions: Diabetes Mellitus, Type 2
Food Supply
Poverty
Minority Health
Obesity
Keywords: Diabetes Mellitus, Type 2
food insecurity
food prescriptions
minority
low-income
Lead sponsor: Sansum Diabetes Research Institute
Sponsor class: OTHER
Collaborators: name: United States Department of Agriculture (USDA)
First posted: 2019-05-07
Enrollment: 303
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Intervention model description: Eligible and consented participants in this program will be asked to complete 12 visits. Over the course of these visits, participants will collect 10 weekly organic vegetable prescriptions signed by a qualified medical practitioner, as well as complete health screenings and questionnaires during the first and last visits. At each prescription pick-up visit, each participant will receive a week's "dose" of organic vegetables. The outcome measures will be collected at Visit 1 after obtaining informed consent and at Visit 12 after the completion of 10 weeks of prescriptions. Additionally, participants will be invited to submit via cell phone photographs of meals featuring their prescribed vegetables. At an optional Visit 13, offered 6 months after Visit 1, an additional health screening will be conducted.
Primary purpose: TREATMENT

Brief summary: Farming for Life aims to determine the health impacts of providing weekly "prescriptions" of fresh organic vegetables to adults living with or at risk of type 2 diabetes. Over 4 years, up to 400 adults diagnosed with or at high risk of developing type 2 diabetes will be engaged for 3 months each, and receive weekly doses of locally-grown organic vegetable prescriptions. The end-points for comparison will be changes in blood pressure, weight, waist circumference, glycemic control \[defined as Time in Range (TIR) (70-140mg/dl)\] using continuous glucose monitoring (CGM), and HbA1c levels (a measure of long-term blood glucose level control) after 3 months compared to baseline measurements. Additional assessments will be made on the impact of the organic vegetable prescriptions on food security. At an optional Visit 13, offered 6 months after Visit 1, an additional health screening will be conducted.

Prevalence and risk of type 2 diabetes in the US is disproportionately high among low income and minority groups and is exasperated by high levels of food insecurity. The investigators hypothesize that improving access to fresh organic vegetables will result in measurable health outcomes for adults with type 2 diabetes and those at risk of developing the condition. This represents a promising and potentially cost-effective strategy for improving diabetes outcomes at a population level, particularly among low income, minority populations with type 2 diabetes.

Detailed description: Farming for Life will recruit adults with or at high risk of developing type 2 diabetes (non-insulin treated). Because diabetes rates are disproportionately high in low income and minority populations, the investigators expect that many participants will be members of these groups. After obtaining written consent, participants will receive 10 weekly free "prescriptions" of fresh organic vegetables sourced from local growers. Health measurements will be conducted by trained clinical staff at baseline and upon completion of the intervention period.

The total duration for the program is approximately 4 years, in which up to 400 participants may be engaged. Program visits will take place at vegetable distribution centers and clinical locations (SDRI or other clinical sites). SDRI will ensure provision of appropriately trained clinical staff and equipment to obtain accurate clinical measurements.

Potential participants will be recruited via bilingual outreach materials. Up to 440 individuals will be enrolled for an anticipated 400 individuals completing the program (8% anticipated dropout rate). A subset of approximately 120 participants will use CGM.

Eligible and consented participants in this program will be asked to complete 12 visits, with an optional 13th visit. Over the course of these visits, participants will collect 10 weekly organic vegetable prescriptions that are signed by a qualified medical practitioner, as well as complete health screenings and questionnaires during the first and last visits. For those using CGM, data will be collected by study staff at an additional Visit 3b, concluding the first 14 days of participation, and at Visit 12, concluding the final 14 days of participation. At each prescription pick-up visit, each participant will receive a week's "dose" of organic vegetables. The outcome data will be collected at Visit 1 after obtaining informed consent and at Visit 12 after the completion of 10 weeks of prescriptions. Additionally, participants will be invited to submit via cell phone, photographs of meals featuring their prescribed organic vegetables. At an optional Visit 13, offered 6 months after Visit 1, an additional health screening will be conducted.

Participants may receive nutrition education in the form of printed material featuring organic vegetable recipes and nutrition guidance offered at vegetable collection sites. Recipes will be sourced from the American Diabetes Association Diabetes Food Hub website (www.diabetesfoodhub.org). Aside from the weekly supply of organic vegetables allocated by prescription, health measurements, and printed nutrition education materials, there will be no compensation nor other incentives for program participants.

The Unity Shoppe in Santa Barbara (http://www.unityshoppe.org/) hosted Farming for Life in a pilot and will be a storage and distribution site. If necessary, additional appropriately-equipped, Independent Review Board (IRB) approved sites may be used. Visits 1, 12, and 13 will occur at SDRI and, if necessary, additional appropriately-equipped, IRB approved clinical sites.

The organic vegetables for this program will primarily be sourced and purchased wholesale from two or more farms within 100 miles of the vegetable distribution location/s. Organic vegetables received for prescription distribution will be coded and tracked through an inventory system.

Visit 1 begins with screening and enrollment via the initiation of the informed consent process. Participant eligibility will be confirmed following review of the inclusion and exclusion criteria by program staff. Each participant will be provided with oral and written information (English and/or Spanish, as appropriate) describing the nature and duration of the program. Prior to initiation of program-related procedures, the participant will sign and date the written informed consent and authorization form, authorizing the use and disclosure of the participant's protected health information (PHI). The participant will also sign the California Experimental Subject's Bill of Rights.

Once enrolled via informed consent, participants will first complete questionnaires on diabetes management, food security and health. Then participant height, weight, blood pressure and waist circumference will be measured. HbA1c level will be measured via finger-stick. A subset of up to 120 participants will then be trained to wear CGM sensors under supervision of staff. Participants will be informed that the CGM data will be blinded during each CGM session. The CGM data for each participant who may wear a CGM sensor will be summarized using software which produces both a statistical and graphic display of data. Participants will then receive a prescription for 10 weeks of organic vegetables. Finally, participants will be invited to share photographs of and recipes for meals they prepare with their prescribed organic vegetables.

Visits 2-11 will all follow the same format and will include the fulfillment of weekly prescriptions. The types and quantities of organic vegetables distributed to each participant will be tracked. For those using CGM, during visit 3 the CGM sensor will be removed, and during visit 10 a CGM sensor will be inserted.

During Visit 12, clinical measurements will be taken and recorded as in Visit 1. For those using CGM, the CGM sensor will be removed and data will be downloaded from the recorder. After these measurements, participants will complete questionnaires on diet, food security, and health as they did in Visit 1. Participants will also complete an Exit Questionnaire to gauge satisfaction with and experience participating in the program.

At an optional Visit 13, offered 6 months after Visit 1, an additional health screening will be conducted.

Eligibility criteria: Inclusion Criteria:

1. Adults ≥ 18 years of age at Visit 1
2. Self-reported diagnosis of type 2 diabetes OR self-reported as at high risk for developing type 2 diabetes
3. Based on program staff's judgment, subject must have a good understanding, ability, and willingness to adhere to the protocol

Exclusion Criteria:

1. Currently taking insulin as treatment for diabetes
2. Pregnant
3. Any active clinically significant disease or disorder, which in the investigator's opinion could interfere with the participation in the trial
4. Mental incapacity, psychiatric disorder, unwillingness or language barriers precluding comprehension of program activities and informed consent
5. Participation in other trials involving medication or device within 1 month prior to Farming for Life enrollment
6. Known or suspected abuse of alcohol, narcotics, or illicit drugs

Primary outcomes:
measure: Improve cardio-metabolic health in adults with (non-insulin treated) type 2 diabetes or at risk for type 2 diabetes as measured by blood pressure.
timeFrame: 12 weeks
measure: Improve cardio-metabolic health in adults with (non-insulin treated) type 2 diabetes or at risk for type 2 diabetes as measured by body mass index.
timeFrame: 12 weeks
measure: Improve cardio-metabolic health in adults with (non-insulin treated) type 2 diabetes or at risk for type 2 diabetes as measured by waist circumference .
timeFrame: 12 weeks
measure: Improve cardio-metabolic health in adults with (non-insulin treated) type 2 diabetes or at risk for type 2 diabetes as measured by hemoglobin A1c.
timeFrame: 12 weeks
Secondary outcomes:
measure: Improve food security for adults with or at risk for type 2 diabetes assessed by U.S. Household Food Security Survey Module: Six-item short form
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Improve glycemic control measured by continuous glucose monitoring (CGM)
timeFrame: Visit 1, Week 1 to Visit 3, Week 3 and Visit 10, Week 10 to Visit 12, Week 12
Other outcomes:
measure: Acculturation measured by the Brief Acculturation Scale for Hispanics (BASH)
timeFrame: Visit 1, Week 1
measure: Socio-demographics assessed by questionnaire
timeFrame: Visit 1, Week 1
measure: Concurrent medications assessed by visual inspection
timeFrame: Visit 1, Week 1
measure: General health measured by questionnaire
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Food consumption behavior measured by questionnaire
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Factors influencing food consumption measured by questionnaire
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Sleep evaluation by questionnaire
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Mood evaluation by questionnaire
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Pain evaluation by questionnaire
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Physical activity evaluation by questionnaire
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Total daily tortilla consumption evaluation
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Daily sugar-sweetened beverage consumption evaluation
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Number of times per week eating meals prepared away from home
timeFrame: Visit 1, Week 1 and Visit 12, Week 12
measure: Participant experience with the program evaluated by questionnaire
timeFrame: Visit 12, Week 12
Locations:
city: Santa Barbara
country: United States
facility: Sansum Diabetes Research Institute
state: California
Study officials:
affiliation: Sansum Diabetes Research Institute
name: David Kerr, M.D.
role: PRINCIPAL_INVESTIGATOR
References:
citation: Kerr D, Barua S, Glantz N, Conneely C, Kujan M, Bevier W, Larez A, Sabharwal A. Farming for life: impact of medical prescriptions for fresh vegetables on cardiometabolic health for adults with or at risk of type 2 diabetes in a predominantly Mexican-American population. BMJ Nutr Prev Health. 2020 Oct 5;3(2):239-246. doi: 10.1136/bmjnph-2020-000133. eCollection 2020 Dec.