when eudaimonia is described as a way of functioning, hedonia as an experience) and the terms eudaimonia and hedonia are sometimes defined vaguely or applied to concepts that may be mere correlates. Yet research on these concepts faces challenges as well: findings based on different operationalizations can be quite discrepant definitions of eudaimonia and hedonia sometimes fall into different categories of analysis (e.g. Interest in eudaimonia (e.g., growth, meaning, authenticity, excellence) and its distinction from hedonia (e.g., pleasure, enjoyment, comfort, absence of distress) is growing rapidly, as researchers recognize that both concepts are central to the study of well-being.
