Applause! Applause! Applause!
The diet industry is rife with pseudoscience, contrivances and ploys such as this and has more than enough low-information public to keep their flotilla of bilge in happy circulation. This charlatan states that gluten from various sources such as wheat "tears" and damages our intestinal track. I guess no one told God that wheat is bad for us.
See the example of biblical verse of Ezekiel 4:9, the combination is said to be a complete meal that satisfies all nutritional requirements. The combination of grains God gave Ezekiel makes for the proper balance of amino acids to provide a complete protein. That's probably how Ezekiel was able to survive 390 days while lying on his side and eating only this bread.
The additional suggestion of buying her $60.00 shake mixture(s) along with diet books and various supplements should have been our first clue.
You are preforming a civic duty. Muchas gracias, señora.