The 33-year-old vented about her frustrations during an impromptu Twitter chat with her fans on Friday.
One fan wrote in saying, "Why is it so hard to believe she works out hard for her body? Let her be skinny in peace!You look great!"
"Preach! LOL thank you," Kardashian responded. "It sucks when people make up surgery or photoshop lies when I am so disciplined & work so hard! Just trying to motivate others & show anyone struggling with weight they can totally achieve whatever they want if they are dedicated!"
Back in November, expressed her anger towards the criticism over her weight loss.
The new mother added, "Say what u want about me but I work hard & am the most disciplined person u will ever meet!"
Just days ago, Kardashian revealed that she was going to start back on her strict Atkins regimen this week because she wanted to shed a little bit of holiday weight.