I will. There's a huge industry that caters to a few million people with health advice and products that are based in ancient superstitions and terrible research. It preys on the manufactured sense of insecurity about body, looks, and mortality. Giselle has bought in to a lot of it as has Brady's health advisor (name I forget). They mix all this crap in with a few bits of good advice and science, and make billions on it, and do a lot of environmental destruction along the way while contending that they are green.
Here's a good example:
goop | A modern lifestyle brand.
Some reference material:
The Beauty Myth Summary - eNotes.com
In the larger context, this is a significant piece of Giselle's legacy.
And yeah, she's strong, focused, smart, determined, and thus very good at it.