The 29-year-old star of 13 Reasons Why and Night School has detailed her struggle to "get help", both accepting it and finding a facility that has availability in the US.
Winters thanked her "support system", including her followers on social media who voiced their concerns about her worryingly low weight, as she "didn't realise" she "needed" to "be here".
"Guys! I'm so excited, because guess what, I received the gift of help this week. I know a lot of you guys have been really worried about me on Instagram, and I also have been keeping up with my doctor and things like that, 'cause I wasn't trying to get like this. I wasn't trying to get this skinny, I don't want to be this skinny either."
Anne Winters admitted to fans on Instagram that she hadn't realised she needed to be in treatement. (AP PHOTO)
Winters added that it was "really freakin' hard to get help" and many facilities only take patients aged 26 and under.
"Good news is I'm going to get back on track so my body's no longer holding me back!"
Over the weekend, she shared an update that she had made it to treatment.
"But today …. I am just so grateful for my support system. Didn't realise I actually needed to be here … I learned when malnutrition takes over- ur mind can convince you your fine - which I felt."
The Orville star explained how she had no idea her body was "maybe on the last leg of survival" because she didn't feel weak and had lots of energy.
"I honestly thought I knew my body better than this. But hey, I'll admit I was wrong. Thanks guys for all us support (sic) …"
On Sunday Winters posted that she had completed day one and her mother had visited her.
"Definitely easy keeping busy here- getting everything ready to move out of my house in LA and working on my business in Bali. I'm a busy boss lady … glad I'm here on the fast (track) to my next venture awaiting me … Thankful my mommy is here to help me. ur never too old to need ur momma (sic)".
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