Despite the grossly erroneous stats listed here, Emily Deschanel is considerably bigger than Tamara Taylor. That's not always the determining factor, but while thin, Emily looks to be in good shape. I like Tamara and wouldn't want to see her demolished, but she's a thin, flat-chested, non-muscular woman, giving away three inches and 12-15 pounds.
Just like real people, actresses' weight fluctuates, but with celebrities working on the same show there are many chances to compare them side by side over time.