Dementia and Diabetes Prevention Program

  • End date
    Jun 27, 2024
  • participants needed
  • sponsor
    University of California, Davis
Updated on 8 October 2021
cognitive impairment
cognitive decline
cognitive assessment
diabetes prevention


This is a multicenter, randomized 2-arm clinical trial of two lifestyle interventions varying in intensity and format, in 400 older African American and non-Hispanic whites at increased risk of cognitive decline and dementia in the East San Francisco Bay Area. The trial will include two lifestyle interventions that differ in intensity and format:

  1. Aerobic Exercise (AEx) Intervention that involves aerobic activities with in-class walking workouts and tutorials and carried out at the East Oakland Sports Center (EOSC) and Tice Creek Fitness Center (TICE).
  2. Dietary counseling to support adherence to the Mediterranean-Diet Approaches to Stop Hypertension (DASH) Intervention for Neurodegenerative Delay (MIND) diet to encourage increased consumption of berries, green leafy and other vegetables, whole grains, nuts, fish, poultry, beans and olive oil, and to reduce consumption of fried/fast foods, red meat, whole fat cheese, sweets, butter and trans-fat margarines.


The 8-month diet and AEx regimens used here are theoretically motivated by implementation science and use the best available practices to treat multisystemic disabling processes. The recent Centers for Disease Control (CDC) review of Diabetes Prevention Program (DPP) implementation literature found that 1 hour per week is the optimal length and frequency to balance cost and attentional demands of the participants. DPP class structure generally involves a 10-min weigh-in, a discussion of adherence to personal weight loss and exercise goals, formal DPP content delivery, and lastly a discussion of barriers to adherence. Diet module content focuses on calorie restriction by altering the composition of participants' meals. These goals include reducing trans-fats, saturated fats, sodium, and carbohydrates and increasing fruits, vegetables, whole grains, and fiber. Participants set weight reduction goals for themselves with personalized goals between 5% and 10% of total body weight dependent on the participant's level of obesity - effectively replacing prepared foods with traditional (Mediterranean) diet.

Because cognitive abilities do not appear to change without a corresponding improvement in cardio respiratory (CR) fitness, the 8-month AEx module content optimizes CR fitness improvement with in-class walking workouts and tutorials. All health instructors at TICE and EOSC will have at least an Associates level degree in exercise physiology and be required to have personal training certification. They will always be under the direct supervision of the PI. Direct supervision of the participants by these health instructors will occur for all exercise sessions until the weekly duration target of 150 minutes a week is reached (Week 6). We introduce more flexibility in scheduling exercise when the participant is consistently and safely meeting their goals by allowing unsupervised exercise sessions at the facility when exercise trainers may not be available (i.e. early morning, nights, and weekends). Participants are still required to have at least one directly supervised exercise session per week to maintain contact with program staff and encourage adherence to the program. Unsupervised exercise sessions are conducted similarly to supervised exercise and session data will be reviewed by the exercise instructor at the weekly supervised session.

Per a well-developed literature on DPP best practices,159,160 we will limit intervention class sizes to about 20 people. Over the course of 5 years, we will run 30 to 35 full DPP groups, each session meeting weekly for 20 consecutive weeks of diet-focused or AEx-focused intervention.

Previous studies suggest that salivary hormones such as cortisol, alpha-amylase and testosterone all measure glucocorticoid (GC) sensitivity, a potent biomarker of age-related stress. We will measure three stress markers in spit before and after a participant exercises during the 6-minute walk challenge at baseline and at each follow-up visit. Because better fitness is believed to improve one's reaction to stressful events, changes in these hormones may reflect the adaptation of a person's ability to cope with emotional and physical stress as they become more cardiorespiratory fit.

Condition NIDDM, Diabetes Mellitus, Dementia, Alzheimer's Disease, Diabetes, type 2 diabetes mellitus, diabetes mellitus (dm), type 2 diabetes, type ii diabetes, noninsulin-dependent diabetes mellitus, diabetes type 2
Treatment Aerobic Exercise, Diet Skills
Clinical Study IdentifierNCT04141878
SponsorUniversity of California, Davis
Last Modified on8 October 2021


Yes No Not Sure

Inclusion Criteria

Sedentary (as per the Telephone Assessment of Physical Activity)
Poor diet (as per the MIND Diet Screener)
Cognitive function: absence of significant cognitive impairment as per the modified Telephone Interview for Cognitive Status (TICSm; age-, education-, and race-adjusted TICSm >32)
Lives in a region where the DDPP interventions will be delivered
Does not plan to travel outside of the home geographic area for more than 3 months over the course of the study
Free of physical disabilities that preclude participation in the study
Willing to complete all study-related activities for 32 weeks
Willing to be randomized to either lifestyle intervention group

Exclusion Criteria

Age <60
Body Mass Index (BMI) >40
Any significant neurologic disease, including any form of dementia, Parkinson's disease, Huntington's disease, normal pressure hydrocephalus, brain tumor, progressive supranuclear palsy, seizure disorder, subdural hematoma, multiple sclerosis, or history of significant head trauma with persistent neurologic sequelae or known structural brain abnormalities
History of major depression within the last 12 months
History of bipolar disorder or schizophrenia as per Diagnostic and Statistical Manual of Mental Disorders (DSM) V criteria
History of alcohol or substance abuse or dependence within the past 2 years, as per DSM V criteria
Use of psychoactive medications within the last 3 months including tricyclic antidepressants, antipsychotics, mood-stabilizing psychotropic agents (e.g., lithium salts), psychostimulants, opiate analgesics, antiparkinsonian medications, anticonvulsant medications (except gabapentin and pregabalin for non-seizure indications), systemic corticosteroids, or medications with significant central anticholinergic activity; in the absence of major depression, stable dose use of selective serotonin reuptake inhibitors or serotonin and norepinephrine reuptake inhibitors are allowed
Health profiles that would jeopardize their safety to participate: (Screen failures will be referred immediately to a physician for medical examination): (1) Myocardial infarction or symptoms of unstable coronary artery disease (e.g., angina) in the last six months, (2) Uncontrolled hypertension within the past 6 months, (3) Morbid obesity (BMI<40), (4) History of clinically-evident stroke, (5) Clinically-significant infection within the past 30 days, (6) Significant pain or musculoskeletal disorder limiting the ability to participate safely, or (7) Clinically significant
Past or current use of insulin to treat type 2 diabetes
Serious diabetic event within 6 months of enrollment
Lung disease requiring either regular use of corticosteroids or the use of supplemental oxygen (inhaled steroids for asthma is permissible)
Renal disease
Clinically significant abnormalities in laboratory blood tests as per judgment of the Study Physician
History within the last 2 years of treatment for primary or recurrent malignant disease, excluding non-melanoma skin cancers, resected cutaneous squamous cell carcinoma in situ, basal cell carcinoma, cervical carcinoma in situ, or in situ prostate cancer with normal prostate-specific antigen post-treatment
History of hip fracture, joint replacement, or spinal surgery in the last 6 months
Currently receiving physical therapy or cardiopulmonary rehabilitation
History of a malabsorptive bariatric procedure (gastric bypass, biliopancreatic diversion); other bariatric procedures involving restriction (i.e., sleeve, band) are not exclusionary
For women: currently pregnant, pregnant within the past 6 months, or planning to become pregnant within the next 6 months
Currently incarcerated
Receiving hospice care
Adults unable to provide consent for participation
PI/Study Physician discretion regarding appropriateness of participation or concern about intervention adherence
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