"I just want to send a message to the parents of kids that are really overweight. ... I think it's just really irresponsible of parents to send them out looking for free candy just 'cause all the other kids are doing it," the woman told Y94 during a radio interview.
The old trick of giving out little boxes of raisins didn't go far enough for her, as she aims to treat parents to a word of unsolicited advice.
The woman, who wouldn't identify herself, explained that the letter was addressed to the parents, not children. It says, in part:
"You child is, in my opinion, moderately obese and should not be consuming sugar and treats to the extent of some children this Halloween season.
My hope is that you will step up as a parent and ration candy this Halloween and not allow your child to continue these unhealthy eating habits."
While the woman's intentions may be good, North Dakota State University assistant professor Katie Gordon said the letter might do more harm than good.
"It's just that kind of thing that for some kids, if they're vulnerable, might trigger major problems," Gordon said. "Even if a child is overweight, they might be very healthy because of what they eat and how they exercise. It's ineffective anyway because it's not likely to help the kid."
Others, like David Smith, a cardiologist in Doylestown, Pa. believe the woman will be doing the right thing Thursday night.
"Giving candy to an obese child is like giving a cigarette to a person with emphysema," Smith says. "It is giving a drink to an alcoholic. It is giving heroin to a drug addict."