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I dont understand why someone posted that the Mayo clinic  newsletter
stated that we can have Amaranth, buckwheat, etc...

Here is their statement that I copied and pasted:
Grains/grain products to avoid:  Amaranth* (Caribbean and Asian seed)

Barley (including barley malt)

Buckwheat* (Russian seed)

Bulgur (Middle Eastern wheat)

Groats (crushed barley, buckwheat or oats)

Kamut (Egyptian forerunner of wheat)

Kasha (roasted buckwheat)

Millet** (native to Asia and Africa)

Oats

Quinoa* (native to South America)

Ragi**

Rye

Sorghum** (also called Milo)

Spelt (native to Southern Europe)

Teff** (native to North Africa)

Triticale (hybrid of wheat and rye)

Wheat (couscous, durum, farina graham, matzo semolina, tabbouleh)


*These grains may be gluten free as grown, but during processing may become
contaminated by gluten containing grains.

**Closely related to corn, however, significant studies have not been
carried out on these grains. It is best to avoid them.

Mireille, Waterloo Quebec.