A Study of a Plant-Based Diet and Dietary Supplements in People With Smoldering Multiple Myeloma (SMM) or Monoclonal Gammopathy of Undetermined Significance (MGUS)

Inclusion Criteria: * Confirmed prior diagnosis MGUS or of smoldering myeloma (any time prior). However, confirmation of diagnosis must be documented in their last local oncologist clinic note within 6 months prior to study enrollment. * Age ≥18 years * Willingness to comply with all study-related procedures * Physically able to complete requirements for the study or has someone to assist with the requirements (such as meal preparation, stool shipment and survey completion) * Interested in learning to cook plant-based recipes * Access to smart mobile phone or device with camera and ability to download Keenoa app * Be residing within the United States for the study duration. * English speaking or a family member or caregiver who speaks English and is able to assist with the surveys and phone based Keenoa app. Exclusion Criteria: * Taking any supplements other than vitamin D, iron, vitamin B12, potassium, magnesium, calcium or those needed for a medical indication must be reviewed by PI. If patient is on a supplement (including curcumin, probiotic, omega3) they must stop these for 2 weeks prior to enrollment on study. * Patients that already follow a whole foods plant based diet (ovo-lactovegetarian or processed junk food vegan diets are not excluded). This will be per research dietitian evaluation and discretion after nutrition screening. * Legume allergy * Severe allergies such as anaphylactic shock to peanuts and/or tree nuts, such as cashews * Concurrent participation in weight loss/dietary trials or defined programs (that require specified diets/supplements on the program). Patients on weight loss drugs are eligible. * Mental impairment leading to inability to cooperate * Enrollment onto any other therapeutic investigational study * Concurrent pregnancy * Patients on full dose anticoagulation * If in the opinion of the investigator there maybe any concerns regarding the ability of the patient to complete the study safely * Current self-reported heavy alcohol use and is defined as \>5 drinks per day or \>15 drinks per week * Current self-reported illicit drug use (except inhaled marijuana, vaping or cigarette smoking or medical marijuana. * Has a condition requiring antibiotics within 14 days of study intervention administration. * Plan for travel during the study that would preclude adherence to prescribed diets * History of active inflammatory bowel disease or major gastrointestinal surgery (not including appendectomy or cholecystectomy) within 3 months of enrollment or any history of total colectomy, or bariatric surgery (bariatric surgery which does not disrupt the gastrointestinal lumen, i.e. restrictive procedures such as banding, are permitted)