In a rare interview with fashion website WWD she said:

WWD: Do you have a motto?
KM: There are loads. There’s “Nothing tastes as good as skinny feels.” That’s one of them. You try and remember, but it never works.

The saying, originally coined by weightwatchers,  has been adopted by pro anorexia campaigners and websites for years now, prompting the usual fury that comes wih this sort of thing from people like Miriam Stoppard and, erm, Denise Van Outen who said (in FURY):

"Kate Moss is talking out of her Size Zero backside."

Which learned her.