Inclusion Criteria:  BMI ≥25 Confirmed diagnosis of MGUS or SMM M spike (immunoglobulin) ≥0.2 g/dL or abnormal free light chain ratio with increased level of the appropriate involved light chain Secretory disease Age ≥18 years Willingness to comply with all study-related procedures ECOG performance status of 0-3  Exclusion Criteria:  Patients that already follow a whole foods plant based or vegan diet (ovo-lactovegetarian diets are not excluded) Nut or legume allergy Concurrent participation in weight loss/dietary/exercise programs Mental impairment leading to inability to cooperate Enrollment onto any other therapeutic investigational study Concurrent pregnancy Patients with a known diagnosis of diabetes mellitus will not be excluded but will need to be followed regularly with an endocrinologist/primary care physician during the trial period. Positive HBV, HCV, HIV PCR testing Non English speaking