Help Heat: be too thin

The Monday, August 15, 2005 Media Guardian's Media Monkey column has noticed Heat's obsessional too-skinny themette:

Followers of Heat magazine may be feeling a little confused. The Emap title, which began life as an entertainment bible before switching its focus to celebrity shagging, now appears to have morphed into a groovy edition of Weight Watchers. Barely a week goes by without it obsessing about the weight of one celebrity or another .... Perhaps the answer might be that when they put "skinny" on the front cover, sales leapfrog over the 600,000 mark.

So think again, skinny celebs. Do you want to help these people who are exploiting you?

Questions: Why do celebs (and it seems to be women in particular) get so thin? A slender, toned body looks better, and healthier, so why go further? And what does Heat think it's doing here (apart from making money), especially since it's also fond of celeb "new look", "how I lost weight" articles?