What someone weighs is their own business.
I would love to see the reaction if she had gained weight and the title was Scary Fat Weight Gain for Guilliana Rancic fuels fat, obese rumors. There would have been people all over this topic saying it was nobody's business.
In addition since she had cancer, nobody knows if she is not well from some kind of treatment. I had a relative who took a medication after having undergone treatment for breast cancer and she lost her appetite from it.
Rumors are just that.....rumors.