Hello, like everything else in the world of food & supplements, the answer is maybe. I think, from reading your posts, that you are doing a lot of research, so you know that the information is "all over the board" and hard data is difficult to find. One of the problems, when it comes to studies of slowing/preventing progression. is that research grants are usually for a couple of years - that doesn't always give us the long term data we need to draw conclusions.

For myself, I try to avoid Facebook discussions, except maybe on closed, monitored groups when it comes to my health. Too much opinion & speculation (positive & negative) and not enough facts. Also too many people selling their book/supplement/cure...with or without proof.

All that said, there is some evidence-based material on curcumin possibly being helpful, I found a couple of small research studies. I will provide the links & let you dive in.
https://www.myelomacrowd.org/myeloma/community/articles/curcumin-gets-positive-results-small-mgus-smoldering-study
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3445886/
And the good news is, there is at least one clinical study underway:
https://clinicaltrials.gov/ct2/show/NCT04731844
Sue

I'm not sure if there is any evidence on any specific diet related to
Monoclonal gammopathy of undetermined significance (MGUS), which is what I have.
However I have been a vegan for 20 years and about the time I was diagnosed with magus, (approx 8 years ago), I had been eating a very lot of pure peanut butter on a regular basis. Then I read peanuts are actually very bad for you and can even increase proteins in your blood. I since stopped and now only moderately eat almond butter. My doctor said she really didn't think it was related. My yearly blood tests now are always with low enough levels, but the protein is still present, but still posing no threat. I really don't have any other major issues aside from my normal allergies, my weight is low and I'm healthy. I feel that being a vegan, eating lots of green asian vegetables, mushrooms, non gluten breads and rice, (I have Celiac), and drinking teas is the way to stay healthy and to live a long life. Hopefully that will continue to be the case.