There is controversy about how much Eddy used morphine.
 Biographers Ernest Sutherland Bates and Edwin Franden Dakin described Eddy as a morphine addict.
Miranda Rice, a friend and close student of Eddy, told a newspaper in 1906: "I know that Mrs. Eddy was addicted to morphine in the seventies."
A diary kept by Calvin Frye, Eddy's personal secretary, suggests that Eddy occasionally reverted to "the old morphine habit" when she was in pain.
Gillian Gill writes that the prescription of morphine was normal medical practice at the time, and that "I remain convinced that Mary Baker Eddy was never addicted to morphine."

Eddy recommended to her son that, rather than go against the law of the state, he should have her grandchildren vaccinated.
She also paid for a mastectomy for her sister-in-law.
Eddy was quoted in the New York Herald on 1 May 1901: "Where vaccination is compulsory, let your children be vaccinated, and see that your mind is in such a state that by your prayers vaccination will do the children no harm.
So long as Christian Scientists obey the laws, I do not suppose their mental reservations will be thought to matter much."

Eddy used glasses for several years for very fine print, but later dispensed with them almost entirely.
She found she could read fine print with ease.
In 1907 Arthur Brisbane interviewed Eddy.
At one point he picked up a periodical, selected at random a paragraph, and asked Eddy to read it.
According to Brisbane, at the age of eighty six, she read the ordinary magazine type without glasses.
Towards the end of her life she was frequently attended by physicians.
There is controversy about how much Eddy used morphine.  Biographers Ernest Sutherland Bates and Edwin Franden Dakin described Eddy as a morphine addict. Miranda Rice, a friend and close student of Eddy, told a newspaper in 1906: "I know that Mrs. Eddy was addicted to morphine in the seventies." A diary kept by Calvin Frye, Eddy's personal secretary, suggests that Eddy occasionally reverted to "the old morphine habit" when she was in pain. Gillian Gill writes that the prescription of morphine was normal medical practice at the time, and that "I remain convinced that Mary Baker Eddy was never addicted to morphine."
Eddy recommended to her son that, rather than go against the law of the state, he should have her grandchildren vaccinated. She also paid for a mastectomy for her sister-in-law. Eddy was quoted in the New York Herald on 1 May 1901: "Where vaccination is compulsory, let your children be vaccinated, and see that your mind is in such a state that by your prayers vaccination will do the children no harm. So long as Christian Scientists obey the laws, I do not suppose their mental reservations will be thought to matter much."
Eddy used glasses for several years for very fine print, but later dispensed with them almost entirely. She found she could read fine print with ease. In 1907 Arthur Brisbane interviewed Eddy. At one point he picked up a periodical, selected at random a paragraph, and asked Eddy to read it. According to Brisbane, at the age of eighty six, she read the ordinary magazine type without glasses. Towards the end of her life she was frequently attended by physicians.
Mary Baker Eddy