Former BEVERLY HILLS, 90210 star Tiffani Thiessen battled a secret health crisis before she conceived baby daughter HARPER last year (09) - she had mercury poisoning.
The actress became a mum in June (10) but has revealed she had to wait a year before she could even think about motherhood after her passion for tuna made her ill.
She tells the Globe, "I ate tuna twice a week, which I didn't think was a big deal. Apparently it was - tuna is high in mercury.
"I had to go through a whole process, which took over a year, to get rid of all the mercury that was in my body."