Vitamin C content varying between frozen and fresh blueberries

edited May 16 in Help

When adding my 80g portion of frozen blueberries to chronometer, I've noticed that the nutrient levels appear to be very low; especially vitamin C which blueberries are meant to be high in.

I initially thought, the frozen berries must weight more therefore leading me to use less berries overall when I weigh my portions - but it turns out that gram for gram frozen and fresh blueberries have the same calorie content.

So why is the nutritional information dramatically less, despite evidence showing that the nutritional content should be same - if not better?

Source:
Article
Research paper 1
Research paper 2

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