A hunger strike is a method of non-violent resistance or pressure in which participants fast as an act of political protest, or to provoke feelings of guilt in others, usually with the objective to achieve a specific goal, such as a policy change. Most hunger strikers will take liquids but not solid food. A hunger strike cannot be effective if the fact that it is being undertaken is not publicized so as to be known by the people who are to be impressed, concerned or embarrassed by it. Hunger strikes have sometimes been forcibly ended through the use of force-feeding.