Yes stewed plums are very healthy for you although when you stew the plums some of the nutrients are lost but not all the nutrients are lost when you stew plums.
Both stewed plums and non stewed plums are very nutritious for you though and you'll reap a lot of health benefits if you eat plums often enough.
Plums including stewed plums contain many vitamins and minerals, as well as fiber and antioxidants that can help reduce your risk of several chronic diseases as well as possibly preventing cancer.
Plums including stewed plums can also help get your bowels moving if you're constipated and they can help keep you regular.
Plums are also a good source of potassium and the plums can protect your body against cell-damaging free radicals.
Eating plums daily or at least every few days or so can help keep you healthy and provide you with lots of energy.
I like to eat both stewed plums and also love to snack on plums that are not stewed.