In order to maximize the chance of IVF success, couples need to ensure that their preconceptual health is optimal to increase the quality of gametes and reproductive fitness. This text reviews the medical and lifestyle factors that can affect the body at preconception stage, such as micronutrients, stress, hormonal and gynecologic assessment, as well as environmental factors such as optimal weight and age for childbirth. This book will enable all medical practitioners and healthcare professionals to give evidence-based advice to influence the success rate of subsequent IVF cycles, and ensure that every child is born in the best possible condition. Part of a four-book series on optimizing different aspects of the IVF cycle, this book focusses on preparing the body for assisted conception. Other books in the series focus on the egg and embryo, the endometrium, and the sperm.