For almost a decade now there have been anecdotal reports of people suffering from disturbed taste sensations after eating pine nuts. The symptoms take a day or so to develop, and are usually described as persistently bitter, metallic sensations that spoil the taste of all foods. In most cases they go away after a week or two.
Several European investigations have failed to find a cause for pine-nut mouth, but the Danish food ministry may have cracked the case.
