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.