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Mary Tyler Moore has been fighting type 1 diabetes since she was 33, and now, at 77, the disease has taken a debilitating toll, according to her old friends and co-stars.

Betty White tells Closer Weekly:

Her eyesight is the big problem is right now … (Mary) is almost beyond the point (of being able to see).

Dick Van Dyke talks to her on the phone:

She hasn't been too well. She's really having a battle with it, I'm sorry to say.

Valerie Harper, struggling with her own health woes, of course, says diabetes "does ravage (Mary's) body, but she stays healthy."

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