I haven't heard this, but if you're concerned, here's a GREAT pancake mix from Cook's Country:
Pancake Mix (Makes about 6 cups of mix)
2 cups all-purpose flour
2 cups cake flour
1 cup nonfat dry milk powder
3/4 cup malted milk powder (Carnation Original)
1/3 cup sugar
2 tablespoons baking powder
1 teaspoon baking soda
1 tablespoon salt
12 tablespoons butter, cut into 1/2-inch pieces
Process all ingredients in a food processor until there are no lumps and the mixture is the texture of wet sand, about two minutes. Freeze in an airtight container for up to two months.
To make 8 pancakes: Whisk 2 cups mix, 2 lightly beaten eggs, and 1/2 cup buttermilk in a large bowl until smooth. Pour 1/4-cup portions of pancake batter into large nonstick skillet and cook over medium-low heat until golden brown, about two minutes per side. Repeat with remaining batter.
"Be kind to your neighbor... he knows where you live." -Brian Copeland