Caitlyn Jenner is apparently trying to keep up with her famous daughters in the weight loss department. A source tells RadarOnline.com exclusively Jenner has gone on an extreme diet, eating only 600 calories a day and drinking gallons of coffee, all in an effort to please girlfriend Sophia Hutchins. Check out Jenner's scary skinny frame and diet technique in this Radar gallery.
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"She's obsessed with looking like a runway model," an insider told Radar.
"Caitlyn has taken a cue from Kendall and her model pals on how to get there."
The source says Jenner, 68, can fit into single digit jeans now, and has "abs to die for" ever since drastically changing her diet.
"Caitlyn won't eat anything that comes from a box or is man-made," the insider explained. "And she has a chef preparing small meals that she portions out with a scale."
She also drinks several cups of coffee each day, because of the diuretic effect.
Jenner is upping her exercise routine as well, doing Pilates to get lean and staying away from the weights since her muscles are big enough.
The former Olympic gold medalist had a breakdown two years ago, after the hormones she was taking as part of her transformation caused her to balloon up in weight.
Friends revealed her waist-line thickened, and she had to go up a few notches in her belt.
But finding new love has given her the motivation to shed the extra pounds, the informant claimed.
"What's really driving her is she wants to look good for Sophia," the source confessed.
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