The term is not formally defined by the Food and Drug Administration. But, the government agency doesn't object to the use of the term if the food does not contain added color, artificial flavors, or synthetic substances.

“Gluten-free” does not indicate that a food is whole grain, organic, low carb, or healthy. In fact, many gluten-free foods are highly processed and include ingredients like refined white rice, sugar, and salt.

Grass-fed does not mean that the cattle's feed is organic, or that they aren’t given hormones or antibiotics. 

The term organic doesn't necessarily mean healthy, as evidenced by organic candies and baked goods. Once again, when buying packaged food, the real litmus test is the ingredient list.