The state of health and life satisfaction are influenced not only by social and demographic factors, but also by a number of other factors: the rate of occurrence of sickness and health problems, lifestyle, how leisure time is spent, a balanced diet, ecological conditions, etc. This book provides a review of determinants of life satisfaction, psychological implications, and the impact of life satisfaction on the quality-of-life. Chapter One studies the influence of social and demographic factors (age, gender group, lifestyle, presence or absence of chronic diseases) on parameters of self-assessed health and life satisfaction by studying the population of Poland. Chapter Two provides an evidence-based review of gratitude interventions. Chapter Three investigates the connection between well-being and time use with the focus on working parents. Chapter Four examines the impact of health-related quality of life on female migrant workers suffering from cadmium poisoning in China.