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 concurrently and up to 180 days prior to study start date
* 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)
* Plan for prolonged travel during the study that would preclude adherence to prescribed diets
* History of major gastrointestinal surgery (not including appendectomy or cholecystectomy) within 3 months of enrollment
* If already taking curcumin or omega 3 supplements patients must be willing to stop it on the date of trial consent for study duration.