In today’s FAMM Research Series episode, I’m sharing a research study that looks at the impact of under-eating on the menstrual cycle and your reproductive hormones! Today’s episode is sponsored by the Fertility Awareness Mastery Mentorship program, class of 2024!  Use this link to join the waiting list for next year’s program! Today’s episode is also sponsored by the Fertility Awareness Mastery Online Self-Study Course.  The most in-depth and comprehensive online fertility awareness self-study program available. Click here to join now! Topics discussed in today's episode: How calorie restriction and exercise effect the menstrual cycle Who the study focuses their research on  How the study group was broken up  What the study measured What the difference was between the two different study groups What were the different outcomes based on the different study groups  How the menstrual cycle was effected in both study groups How were the women's estrogen level and hormone production effected during the study  How could these potential hormonal changes show up in women's cycle for those not charting Connect with Lisa: You can connect with Lisa on her Instagram, Facebook, Twitter, and on her website.   Resources mentioned: Estrogen and progesterone exposure is reduced in response to energy deficiency in women aged 25–40 years The Fifth Vital Sign: Master Your Cycles & Optimize Your Fertility (Book) | Lisa Hendrickson-Jack Fertility Awareness Mastery Charting Workbook Fertility Awareness Mastery Online Self-Study Program Related podcasts & blog posts: FFP 457 | Under-eating, Weight Loss, & Your Cycle | Kaely McDevitt FFP 370 | Eat More, Exercise Less, and Loose Weight? | A Women-Centred Approach To Weight Loss | Kitty Blomfield FFP 155 | The Impact of Under-Eating on Your Fertility & Your Cycles | Lily Nichols FFP 028 | Carbohydrate Restriction for Weight Loss | Insulin Sensitivity and PCOS | Franziska Spritzler Join the community! Follow Fertility Friday on Instagram! Subscribe to the Fertility Friday Podcast in Apple Podcasts! Music Credit: Intro/Outro music Produced by J-Gantic A Special Thank You to Our Show Sponsors: Fertility Friday | Fertility Awareness Programs This episode is sponsored by my Fertility Awareness Programs! Master Fertility Awareness and take a deep dive into your cycles and how they relate to your overall health! Click here to apply now! Fertility Awareness Mastery Mentorship Program (FAMM) This episode is sponsored by FAMM! Are you a women's health practitioner looking for a solid way to incorporate comprehensive fertility awareness chart analysis into your practice? If yes, FAMM is the program you've been waiting for. Click here to apply now!