Doug Freyburger wrote:

2) Treating a single meal of only carby foods like oatmeal as
harmless as long as it is not eaten with high protein or high fat
foods. Maybe this is a digestion issue like in Food for Life. It
will work okay for folks without insulin resistance but those are the
ones who tend to do just as well on low fat as on low carb. It will
definitely fail for folks with reactive hypoglycemia, diabetes and so
on.

Yup. In fact, eating carb alone is worse as it causes higher bg rises.
It's better to eat it with fat, which slows the absorption.

you are supposed to eat carbs because of your kidneys

Also note that ASLDC has folks who started low carbing even
after having been diagnosed with kidney damage and they saw
improvement as a result of their dietary changes. With existing
kidney damage, caution is called for, but low carbing when
carefully done is definitely known to help in some cases.

The typical cause of kidney damage is elevated bg, thus carbs cause the
problem rather than solve it.

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