What is more attractive? (MEN ANSWER! women can answer too:)?

My best friend's convinced that skin and bones is beautiful. What do you men like better? Not exactly a woman that's fat, but a girl that's healthy! My best friend has a tiny frame, tiny waste, and a cute little . She's tried starving herself to look like celebrities like Nicole Richie, Kate Moss, Mary-Kate Olsen (Women who I thought were beautiful until they starved themselves too thin!!!) Isn't looking healthy so much more attractive that looking malnourished and like you're dying?