A Calgary woman who was convicted last year of putting sharp metal objects into food products at the Oakridge Co-op has lost her appeal.

Tatyana Granada was found guilty of mischief and trespassing and was sentenced to three years in prison for placing needles, pins and other objects into bakery and dairy products at the store in 2010.

Granada’s appeal challenged the mischief conviction suggesting that the judge wrongly considered evidence from an expert in body mechanics who was brought in to review video of her arm movements while she was in the store.

The Alberta Court of Appeal ruled the judge did not err in accepting the expert's opinion and the appeal was dismissed.

(With files from The Canadian Press)