The 26-year-old singer said she wants to accept herself for who she is, and admitted she has struggled to embrace her own body despite being a "crusader for being yourself".
She told People magazine: "I'm a crusader for being yourself and loving yourself but I've found it hard to practice.
"I'll be unavailable for the next 30 days, seeking treatment for my eating disorder ... to learn to love myself again. Exactly as I am."
The 'Timber' hitmaker is said to be undergoing treatment Timberline Knolls near Chicago, the same facility where Demi Lovato found help.
Despite admitting she needs help, the star has previously spoken about her body in a bizarre but positive way, explaining she uses her boobs to write songs by dangling them over her piano.
She recently said: "What I do is I turn off all the lights and I walk over to the piano naked. Then I gently lower myself and my boobs.
"They go on the keys and I just let them tickle the ivories. They really just go crazy."