Sorry, I can’t answer this question.
Regardless of the original question, plums are nutritious and you should eat them. They’re a very healthy fruit that tastes great when eaten fresh or cooked in pies, tarts, muffins, jams, or choirs” so if your doctor or nutritionist has told you not to eat any fruit because you have stomach ulcers for example it doesn’t negate the nutritional benefit of other fruits like plums.”