Vitamin C content varying between frozen and fresh blueberries
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?
The stability of vitamin C depends on the composition of the food, so we can't say the losses found in vegetables like peas, broccoli and spinach will be the same as other foods like blueberries. Though with changes in our food supply over time (where it's grown, distribution and storage practices, for example) it would be great to update these analyses.
These foods were found to have different vitamin C content at the time of analysis - check it out from the source at Food Data Central:
Blueberries, raw: https://fdc.nal.usda.gov/fdc-app.html#/food-details/171711/nutrients
Blueberries, frozen: https://fdc.nal.usda.gov/fdc-app.html#/food-details/1102704/nutrients
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