Asceticism is a lifestyle characterized by abstinence from worldly pleasures, often for the purpose of pursuing spiritual goals. Ascetics may withdraw from the world for their practices or continue to be part of their society, but typically adopt a frugal lifestyle, characterised by the renunciation of material possessions and physical pleasures, and also spend time fasting while concentrating on the practice of religion or reflection upon spiritual matters, which is thought by some to allow the practitioner's core of consciousness to expand and connect with the infinite universal consciousness. Some individuals have also attempted an ascetic lifestyle to free themselves from addictions to things such as alcohol, tobacco, drugs, entertainment, sex, food, etc.