Dr. Nicola Sykes (formerly Rinaldi) has a PhD in biology from MIT. Since experiencing hypothalamic amenorrhea (missing periods) herself, Dr. Sykes has been on a mission to spread awareness of the condition and how to recover. In 2016 she published the book "No Period. Now What?", updated March of 2019 to be more Health At Every Size aligned. This book is a comprehensive resource that includes much of the medical and scientific research that underlies our current understanding of the triggers for amenorrhea, what steps to take for recovery, and treatments to use for recovery and pregnancy as needed. Dr. Sykes now also works with clients on period recovery and getting pregnant.

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