According to the research, there is no statistically
significant differences between antioxidant levels in fresh vs. frozen berries, so you will not lose those benefits when eating frozen fruit.
They both found the same thing: «no statistically
significant differences between the... [
antioxidant levels] for fresh and frozen strawberries» and «It is concluded, therefore, that freshly picked, fresh commercial, and frozen raspberries all contain similar levels of phytochemicals and
antioxidants per serving.»