Agreed. I returned from a four week cruise during which I gained twenty pounds. I went on a diet which severely restricts sugars, simple carbs, and booze and lost those twenty pounds in less than a month. Sugar is poison.
I suggest the keto diet as something she should perhaps try...but she refuses.
I explain that carbs are sugar in the blood stream and sugar is the killer, but...you know how stubborn people can be.;-)