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The Diabetes Prevention Program-based lifestyle change intervention (DPP) is designed to help overweight breast cancer survivors to reduce their risk of breast cancer recurrence by reducing their excess body fat.

The Highly Microbiota-Accessible Foods (HMAFs) lifestyle change intervention is designed to help overweight breast cancer survivors reduce their risk of breast cancer recurrence by reducing their elevated low-grade inflammation.

The DPP condition consists of 11 health education sessions over 12 weeks, including 2 virtual home visits, two virtual group education sessions and 7 telephone coaching calls. These sessions will teach DPP-based lessons on how to lose excess body fat through calorie restriction and increased physical activity. All dietary and physical activity recommendations are intended to be consistent with federal nutrition and physical activity guidelines.

Diabetes Prevention Program-based lifestyle change intervention (DPP)

The Highly Microbiota-Accessible Foods (HMAFs) intervention approach includes 11 health education sessions, including two virtual home visits, two virtual group education sessions, and 7 telephone coaching sessions. These sessions are designed to help study participants to identify and consume optimally 6 daily instances of minimally processed, fiber-rich food sources, drawn from all four of the MyPlate.gov categories: vegetables, fruits, whole grains and plant-based protein-rich foods (e.g., legumes, nuts and seeds). Increased physical activity is also recommended as a way to optimize the microbial conversion of fiber-rich food sources to short chain fatty acids, which are then expected to reduce excess low-grade inflammation.

Highly Microbiota-Accessible Foods (HMAFs) intervention

William J. McCarthy, Ph.D.

Wendy Rue, B.A.

Jacqueline Wong, B.A.

William J McCarthy, Ph.D.

William J. McCarthy

Pilot randomized controlled parallel group behavior change comparative effectiveness trial involves 30 breast cancer survivors interested in losing excess body fat. Both interventions include dietary + exercise prescriptions that hold promise for reducing the survivors' risk of cancer recurrence. Both interventions are consistent with the Dietary Guidelines for Americans but the Diabetes Prevention Program (DPP)-based approach focuses on weight loss through calorie restriction and increased physical activity while the Highly Microbiota-Accessible Foods (HMAFs) approach is intended to be a low-numeracy version of a Mediterranean-style diet and increased physical activity. The DPP approach is considered to be a high-numeracy intervention because it requires that consumers keep track of all calories consumed and expended per day and to endeavor to maintain a calorie deficit each day during the active weight loss phase. For both conditions, the 12 to 13-week intervention includes 2 virtual home visits, 2 virtual group education sessions and 7 telephone or Zoom-based coaching sessions by well-trained intervenors. Assessments occur at baseline and six months, with systemic inflammation (high sensitivity C-reactive protein) being the primary outcome measure and visceral fat being a secondary outcome. Other prespecified secondary outcomes include gut microbiota alpha-1 diversity, insulin resistance, HDL-cholesterol, daily count of highly microbiota-accessible foods, waist circumference, BMI, systolic blood pressure, ratio of fecal Proteobacteria to short chain fatty acid-generating bacteria and health-related quality of life.

Background. The human gut microbiota influences obesity status and inflammation, two major risk factors for postmenopausal breast cancer recurrence. Whether an exercise and dietary intervention designed to optimize gut microbiota composition might reduce risk for breast cancer recurrence is unknown. To improve the gut microbiota composition, the investigators propose teaching postmenopausal breast cancer survivors to allocate about 20% of their daily calorie intake to consuming a daily count of six fiber-rich, minimally processed, plant-based food choices that comply with federal MyPlate.gov diet recommendations. Preliminary data suggest that the investigators' Highly-Microbiota-Accessible Foods (HMAFs) approach will yield cardiometabolic outcomes equal to or better than those achieved by the traditional Diabetes Prevention Program (DPP) calorie restriction approach at 6 months follow-up. Because breast cancer recurrence risk covaries with cardiometabolic risks, the lower cardiometabolic risk of the HMAFs approach should be associated with reduced risk of breast cancer recurrence.

Hypotheses. The greater diversity of fiber-rich, minimally processed plant foods consumed in the HMAFs condition relative to the DPP condition will result in greater changes in HMAFs participants compared to DPP participants from baseline to 6 months follow-up in the following measures: (primary hypothesis) reduce high sensitivity C-reactive protein, (secondary hypotheses) reduce visceral body fat and increase alpha-1 diversity of gut microbes and increase health-related quality of life.

To test these hypotheses, the research objectives include the following specific aims: 1) Recruit a diverse sample of 30 overweight or obese postmenopausal survivors with stage I, II and IIIa breast cancer; randomly allocate them to two lifestyle change intervention conditions, 2) Obtain baseline and 6-month follow-up assessments of: low grade systemic inflammation, body composition including visceral fat estimation, cardiorespiratory fitness, inflammatory and cardiometabolic biomarkers, fecal samples, and quality of life, 3) Conduct two parallel, three-month behavior change interventions, contrasting the 6-count HMAFs approach with the traditional DPP calorie restriction approach , and 4) Use results to design a ramped-up randomized factorial trial.

If hypotheses are confirmed, the low-numeracy HMAFs approach may, for low-income survivors, be a practical alternative to traditional high-numeracy calorie restriction approaches to reducing risk of breast cancer recurrence.

The two lifestyle change interventions feature a similar exercise prescription and the same sequence of intervention contacts (2 virtual home visits; 2 virtual group education sessions, 7 individual telephone coaching sessions) but differ in dietary approach. The DPP-based diet approach prescribes desired weight loss in overweight breast cancer survivors by restricting daily calorie intake and promoting increased calorie expenditure via physical activity. The HMAFs approach prescribes consuming an optimal six microbiota-accessible foods unaccompanied by pro-inflammatory food components such as saturated fat or added sugar as well as engaging regularly in exercise that elevates the heart rate and reduces inflammation. Only 20 percent of daily calories need to be devoted to HMAFs; the remaining calories can come from daily food choices conforming to the 2020-2025 Dietary Guidelines for Americans.

All assessments will be conducted by project personnel blind to the study participants' randomization status. The investigators responsible for helping participants complete the Automated Self-administered 24-hour (ASA 24) dietary recalls and for assessing their body composition via dual x-ray absorptiometry (DXA) will be kept blind to the study participants' randomization status. Investigators will be kept blind to participant assignment to condition by having the two health coaches refer to their patients by an arbitrary, unique study identifier during weekly debriefings when the study progress by individual participants might be discussed.

UCLA Breast Cancer Survivor Health Promotion Research Study

A Fiber-diverse, Anti-inflammatory Diet and Aerobic Exercise Reduce Risk of Breast Cancer Recurrence

De-identified data will be posted on the website of the UCLA Fielding School of Public Health for access by students and other investigators. Primary and secondary outcomes and demographic characteristics will be shared.

Homeostatic Model Assessment-Insulin Resistance (HOMA-IR) is a recognized measure of insulin resistance, calculated from fasting glucose and fasting insulin values

Waist circumference is measured via non-stretchable measuring tape around the waist at a midpoint between the lowest rib and the iliac crest, upon breath exhalation.

Height measured via wall-mounted stadiometer and weight measured via calibrated digital scale will be used to compute BMI ((kg/(m x m))

Regularly calibrated digital sphygmomanometer will be used to assess the participant's resting systolic blood pressure in millimeters of mercury

Fecal DNA from the V4 region of the 16S ribosomal RNA will be amplified, sequenced and filtered for quality before statistical analysis. The ratio of fecal Proteobacterial abundance to the abundance of short-chain fatty acid-generating fecal microbes is expected to be reduced in healthier guts.

RAND Short Form-20 (SF-20) is recognized instrument for assessing participants' health-related quality of life. Minimum score = 0; maximum score = 100. Higher scores represent higher quality of life.

Fasting serum HDL-cholesterol concentration expected to reflect the experimental differences in dietary patterns. Serum triglycerides will be generated as part of a standard lipid panel.

CRP is commonly used by researchers as a biomarker for systemic inflammation.

Visceral fat is also known as intra-abdominal fat. It is located inside the peritoneal cavity, packed in between internal organs and torso. It is the most metabolically active adipose tissue and positively associated with systemic inflammation.

Fecal DNA from the V4 region of the 16S ribosomal RNA will be amplified, sequenced and filtered for quality before statistical analysis. The Shannon index measures both gene richness and evenness.

From participants' 24-hour diet recalls - The daily sum of different carbohydrate-rich food sources minimally processed and unaccompanied by pro-inflammatory components, especially saturated fat and added sugar.

Spots Global Cancer Trial Database for fiber diversity