I tell them that I'm cutting out refined flour and sugar, as well as other prepackaged foods, for the health benefits. If they press, I'll state that there is a long history of diabetes in my family, and breast cancer, and that processed foods and non-organic meats are disease-inducing.

If they press further, I'll tell 'em even WORMS won't eat refined sugar - you can put a pile of refined sugar in a shed and dump any kind of worm in there, and they won't eat the stuff - has no nutritional value.

That usually shuts them up, because I've resorted to grossing them out

I don't usually tell them exactly what the plan is unless they ask out of a desire to know so they can try it.

Shalom,
Sh'ra