Burning Question.

I've noticed something odd about some of my frozen Weight Watchers "Smart Ones" meals. It involves the meals that have creamy sauces. When I take the meals out of the box, I notice that the sauces are somewhat translucent in appearance; however, after cooking, the sauces become creamy and opaque. I just want to know what unholy chemical reaction is taking place between the sauces and heat to create such a dramatic change. It scares me.