The nut-like gametophytes inside the seeds are particularly
esteemed in Asia, and are a traditional Chinese food. Ginkgo nuts
are used in congee, and are often served at special occasions such
as weddings and theChinese New Year (as part of the vegetarian dish
called Buddha's delight). In Chinese culture, they are believed to
have health benefits; some also consider them to haveaphrodisiac
qualities. Japanese cooks add ginkgo seeds (called ginnan) to
dishes such as chawanmushi, and cooked seeds are often eaten along
with other dishes.
When eaten in large quantities or over a long period,
especially by children the gametophyte (meat) of the seed can cause
poisoning by 4'-O-methylpyridoxine (MPN). MPN is heat stable and
not destroyed by cooking. Studies have demonstrated the convulsions
caused by MPN can be prevented or terminated with pyridoxine.