Did you hear about Sainsbury's Tuna (& other products) being recalled this week due to high levels of histamines:
BBC NEWS | UK | Sainsbury's recalls tuna products
Sainsbury's recalls own-brand tuna products - Telegraph
Looks like the BBC & Telegraph share the same source, this quote is in both of the above reports
Quote:
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"High levels of histamine can be caused by poor refrigeration of fish and can lead to itchiness, headaches, dizziness, vomiting and diarrhoea. "
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I would think that could be quite harmful for folk with allergies/asthma/ecsema/...