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Boysenberries, like their parent fruit - the raspberry, contribute to histamine production due to their high concentration of vitamin C. Although vitamin C is essential for health, in case of histamine intolerance, it acts as a histamine liberator. It can stimulate the release of histamine from mast cells and basophils, adding to the existing histamine load in the body.
Contrarily, another claim suggests a different interaction of vitamin C with histamine. It proposes an inverse relationship between vitamin C and histamine. According to Komericki et al. (2011), vitamin C can degrade histamine and also slow down its release, thereby reducing histamine levels in the body.
There are contradicting beliefs on whether eating boysenberries will increase or decrease histamine levels due to the fruit's vitamin C content. Hence, until there is further research conducted specifically on boysenberries' impact on histamine levels, it is difficult to make a definitive statement.
Reference:
Komericki, P., Klein, G., Reider, N., Hawranek, T., Strimitzer, T., Lang, R., Kranzelbinder, B., Aberer, W. (2011). Histamine intolerance: lack of reproducibility of single symptoms by oral provocation with histamine: A randomized, double-blind, placebo-controlled cross-over study. Wien. Klin. Wochenschr. 123, 15–20.
This statement is based on the vitamin C content in boysenberries and its potential interaction with histamine. Further specific research on boysenberries' direct impact on histamine levels is necessary for a conclusive decision.