If you're trying to produce cold fusion, things may be clearer. However, in the area of human nutrition, there are huge numbers of variables, many of them almost impossible to control for. Different people digest things differently. Different people have different genetics, different activity levels, different exposure to other environmental factors, different other items in their diets. The item being tested is also highly variable: different strains of blueberries, blueberries grown under different conditions (climate, particular weather, farming techniques), blueberries harvested at different degrees of ripeness, different weather, even possibly at different times of day; blueberries treated differently after harvest according to huge numbers of other possible variables -- all of these factors can affect the balance of the nutritional compounds in the specific blueberries used in the study.
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