When Kim Kardashian‘s sisters recently started commenting on her drastic weight loss, the 37-year-old loved every minute of their candid conversation. First, Kendall Jenner accused her of not eating. “Like, you look so skinny,” the model, 22, told her big sister in Instagram story videos Kim shared on July 29. When the reality star insisted, “I’m not that skinny,” another sibling called her out. 

“Kimberly! I can see through you,” an incredulous Khloé Kardashian said before describing Kim’s arms as “pin thin” and her waist as “anorexic.” Kim made it clear she considered every syllable a compliment. “TELL ME MORE,” she captioned the footage. 

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She’s more obsessed than ever with being skinny. “Kim weighs herself every day and freaks out if she gains a pound,” a source exclusively tells In Touch in the magazine’s latest issue, on newsstands now. Kim told her sisters in the video that she weighed 119 pounds but noted that “when I take out my hair extensions, I am less.” 

The fact that she even pointed that out, says the insider, is yet more proof that her weight issues have taken a troubling turn: “Kim’s obsession is all-consuming. It’s all she can think about.” Even more troubling, adds the insider, is that 5-foot-3 Kim is dropping weight so rapidly, she’s now closer to 105 pounds. “She laughed at being called anorexic,” says the insider, “but some fear that’s what’s happening.” 

Kim has relied on a combination of deprivation and intense exercise to get to this point. “Her extreme weight loss is very dangerous,” says the insider. “She works out like crazy.” (Sure enough, on July 30, the day after the videos were filmed, Kim posted another video of herself at the gym at 6 a.m.) But more alarming claims the insider, “Kim has stopped eating.” At the event where the videos were shot, Khloé, 34, quipped that Kim survives on “celery, maybe some lettuce,” while pal Malika Haqq chimed in to suggest “different flavors of oxygen” were also on the reality star’s menu. “Kim doesn’t seem to care about anything except getting as thin as possible,” says the insider. “It’s all she thinks about 24/7.” 

Her husband, Kanye West, has tried to intervene. “He’s always gone for the more curvaceous look and used to see Kim’s body as a work of art, but now he thinks she looks like a million other girls in LA,” the source says of the volatile 41-year-old rapper. “He’s told Kim to stop losing weight and has even accused her of putting more energy into changing her figure than their marriage.” 

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What the mother-of-three to daughter North, 5, son Saint, 2, and baby girl Chicago, 6 months, doesn’t understand is that she’s not just alienating her husband. “She’s putting out a dangerous message to her millions of followers,” says the insider. “Her taking that ‘anorexic’ comment as a compliment was beyond improper. But she doesn’t care that she’s being irresponsible because, as usual, Kim’s only thinking about herself.”  

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