Return again to eating. To participate in this activity, to understand its goals and make use of its concepts, one must accept certain judgments. Food stops hunger. Satisfying hunger is good. Food sustains life. Life is good, and so on. The person who doubts these judgments cannot self-consciously participate in the activity we call eating. She cannot speak of food and hunger, of pain and relief. And, insofar as she cannot speak sensibly about these matters or offer reasons that make her actions intelligible by referring to these goods, we will be hard-pressed to confirm the rationality of her speaking and acting. And since doubting is an activity pursued by rational human beings,it is not exactly clear how her “doubts” fall under that activity. One can have doubts about a particular account of how food stops hunger, sustains life, or ranks among other goods. About these matters, disagreement is common and nature is silent. About these matters, doubt is both possible and possibly rational. And, as rationality goes, so too goes the ability to sustain real doubt. But the person who “doubts” that food stops hunger cannot speak, act, and give reasons for acting in matters related to food as rational human beings do.