Advance directives are critically important for capable individuals who wish to avoid the burdens of life-prolonging interventions in the advanced stages of dementia. However, this paper will argue that advance directives should have less application to questions about feeding patients during the clinical course of dementia than often has been presumed. The argument will be framed within the debate between Ronald Dworkin and Rebecca Dresser regarding the moral authority of precedent autonomy to determine an individual’s future end-of-life care plan. We will use a brief analysis of the positions taken in two important papers that come out of the Dworkin/Dresser debate and a hypothetical patient, John, who will be followed from diagnosis of dementia to death, to show how advance directives should apply to key points in the progression of his disease, particularly in relation to food and nutrition.