Robin Roberts is feeling the love, and she wanted to make sure fans knew it.

The "Good Morning America" co-anchor will undergo a bone marrow transplant today in New York City to treat myelodysplastic syndrome (MSD), a disorder in which the bone marrow fails to produce enough healthy blood cells.

Ahead of the treatment, the 51-year-old TV anchor taped a video message for her fans, which aired on "GMA" today. She said in the video, "This journey is as much about the mind as it is the body... Thoughts are so powerful. You've got to change the way you think in order to change the way you feel. And let me just say this lastly, I feel the love and I thank you for it. Thank you."

The video follows messages she shared with fans via a blog post on Tuesday, where she wrote: "YOU give me the courage to keep going. Bless you & Onward!" Roberts is also a breast cancer survivor.

Early Sept. 20, Dr. Gail Roboz, who is helping Roberts prepare for her bone marrow transplant, appeared again on "GMA" to discuss her treatment. Roboz assured fans "Everything is going great. Medically speaking, everything is going fantastically."

In preparation for the transplant (Roberts' sister Ann was the donor), Roberts underwent extensive chemotherapy. First, she received the "good" chemo, which boosted her blood cells and marrow to get her ready for the next phase, Roboz explained.

"We could see in watching Robin over the summer that she looked fantastic... She was having an easy time with it. That was really MDS-directed treatment," Roboz said. "That was to mow the lawn, get rid of as many MDS cells as possible, boost the bone marrow and get ready for the transplant."

After that, the chemo Roberts received was very different. For three days last week, she had chemo sessions that were two and a half hours and six hours apart.

On Tuesday, she underwent 18 hours of uninterrupted chemo, which decimated her marrow and immune system, according to ABC news. And today, Roberts is finally going in for the transplant.

The procedure itself will take between 30 and 60 minutes and when it's done, medical staff, friends and family will be able to visit, Roboz said.

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Robin Roberts, GMA