Gabrielle Anwar did get thin, but it was mostly muscle and sinew as she got really fit. I didn’t think it looked unhealthy, she was just lean.
Felicity Kendall as Barbara Goode in The Good Life, aka Good Neighbors:
Glad I’m not the only one.
When someone is that lean, every muscle will show no matter what. That said, I’m well aware she trained hard for the role. But it is possible to train and not get that lean. Even her face started looking skeletal.
As always, de gustibus non disputandum est.
…and for the first time ever, I’m not not sure if you’re posting your initials, or your thoughts about Emmy Rossum. 
Maura Tierney
Agreed!
And she hasn’t lost it either, she’s still is absolutely stunning! I don’t think you can find a picture of her where she isn’t gorgeous.
Just image search her and it’s amazing.
How about the chick who plays Peyton in iZombie?
Aimee Garcia from *Lucifer *and Dexter
Linda Park from* Enterprise*
Maybe. I figured it was just her genetics. Some people tend towards wiry and leathery.
Anyhoo, speaking of fit, I nominate Caity Lotz from Legends of Tomorrow et al.
It’s a tie between Susan Dey on the Partridge Family and Susan Dey on L.A. Law.
(In a universe where Mary Tyler Moore never played Laura Petrie).
Jenna Coleman of Dr. Who.
The female cast of Buffy: Sarah Michelle Gellar, Charisma Carpenter, Allyson Hannigan, Emma Caulfield.
Shame on me for overlooking the lovely Eliza Dushku.
correction: the ONLY reason to watch According to Jim. 
Shame on you for overlooking Amber Benson, the secret ingredient in Viagra.
Two more worthies from Sleepy Hollow, the beautiful Mills sisters as played by:
and
Lyndie Greenwood
Guilty as charged. My overlooking of Ms. Benson is inexcusable.
Raven Symone circa 2004
Reagan Gomez
Allison Munn
Nia Long
Melissa Joan Hart
Mindy Kaling
Elisabeth Röhm
Jade Eshete from Dirk Gently’s Holistic Detective Agency.