Diet is mostly for general health; I haven't found anything definitive on diet influencing MGUS progression. Pasta and hot peppers are fine. In general, a FODMAP or Mediterranean type diet, low in sugars, drink enough water, and get enough exercise is what doctors mention. Some people with MGUS have gone vegetarian, in case that helps them. I have had celiac disease for 15 years so exclude anything with gluten. I take Qunol turmeric with curcumin supplements for my "in case that helps" with MGUS. Not much human research on that yet (mice feel better tho). Check with a doctor/pharmacist before major changes if you are on meds. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9301229/