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

Inclusion Criteria: Confirmed diagnosis of MGUS or SMM If non light chain MGUS/SMM then M spike must be either ≥ 0.2 g/dL or BM PC ≥10% (both not required) If light chain MGUS/SMM then involved must be ≥10 mg/dL or BM PC ≥10% (both not required) If IgA MGUS/SMM then an IgA level >350 mg/dL and an abnormal immunofixation is required (M spike criteria not required). If IgD MGUS/SMM then an IgD level >50 mg/dL and an abnormal immunofixation is required (M spike criteria not required). Age ≥18 years Willingness to comply with all study-related procedures ECOG performance status of 0-3 Interested in learning to cook plant based recipes Exclusion Criteria: Patients that already follow a whole foods plant based diet (ovo-lacto-vegetarian or processed junk food vegan diets are not excluded) Legume allergy Severe allergies such as anaphylactic shock to nuts (specifically cashews). Peanuts are not included in the meals. Concurrent participation in weight loss/dietary/exercise programs Mental impairment leading to inability to cooperate Enrollment onto any other therapeutic investigational study Concurrent pregnancy Positive HBV, HCV or HIV PCR test will need to be treated first and once undetectable viral load patients may enroll ≥ Grade 2 electrolyte abnormalities as defined by CTCAEv5.0 (need to be resolved before enrolling on study) If in the opinion of the investigator there maybe any concerns regarding the ability of the patient to complete the study safely or any contraindications Heavy drinker (defined as >2 drinks per day or >14 drinks per week) Current self-reported illicit drug use (eg heroin, cocaine not marijuana)