# FastingBestie > Cycle-aware intermittent fasting for women. FastingBestie syncs fasting windows, nutrition, and daily guidance to the four phases of the menstrual cycle. FastingBestie is an iOS app and educational resource for women practising cycle-synced intermittent fasting. The guides below explain how fasting should change across the menstrual cycle, phase by phase and across different life stages. Content follows the published editorial policy and links its sources. ## Core pages - [FastingBestie home](https://fastingbestie.com/): What FastingBestie is and how cycle-synced fasting works for women. - [How to fast with your cycle](https://fastingbestie.com/how-to-fast-with-your-cycle/): The four-phase approach to fasting with your menstrual cycle instead of against it. - [Why women fast differently](https://fastingbestie.com/the-science/): How the menstrual cycle affects metabolism, energy, and fasting. - [Features](https://fastingbestie.com/features/): What the FastingBestie app does, including cycle-aware recommendations and HealthKit sync. - [Guides index](https://fastingbestie.com/guides/): The full library of cycle-synced fasting guides. ## Foundational guides - [Intermittent Fasting for Women](https://fastingbestie.com/guides/intermittent-fasting-for-women/): Most fasting advice was written for men. What works for women, how your cycle changes the rules, and how to start safely. - [Cycle-Synced Fasting: A Complete Guide](https://fastingbestie.com/guides/cycle-synced-fasting-complete-guide/): A phase-by-phase guide to fasting with your menstrual cycle, including when to extend your window, ease off, eat more, and rest more. - [Intermittent Fasting by Cycle Phase](https://fastingbestie.com/guides/intermittent-fasting-by-cycle-phase/): How fasting should change across each phase of your cycle, with practical windows that fit women's hormones. - [Best Fasting Schedule for Women](https://fastingbestie.com/guides/best-fasting-schedule-for-women/): A practical cycle-aware rhythm that keeps fasting useful without pushing it too far. - [16:8 Fasting for Women](https://fastingbestie.com/guides/16-8-fasting-for-women/): When 16:8 fits, when it backfires, and how to test it safely. - [Monthly Fasting Schedule for Your Cycle](https://fastingbestie.com/guides/monthly-fasting-schedule/): A 4-week fasting rhythm that tells you when to extend your fast and when to back off. - [Cycle Syncing Your Diet](https://fastingbestie.com/guides/cycle-syncing-diet/): What to eat in each phase of your menstrual cycle, alongside cycle-aware fasting. - [Intermittent Fasting and Hormone Balance](https://fastingbestie.com/guides/fasting-and-hormone-balance/): Where fasting supports women's hormones and where it can work against them. ## Guides by cycle phase - [Fasting During Your Period](https://fastingbestie.com/guides/fasting-during-your-period/): What to do and what to skip when fasting on your period. - [Fasting in the Follicular Phase](https://fastingbestie.com/guides/fasting-follicular-phase/): How to use the easiest fasting window of the month well, without pushing too hard. - [Fasting During Ovulation](https://fastingbestie.com/guides/fasting-during-ovulation/): How to handle the peak-energy window with flexibility rather than a rigid long fast. - [Fasting During the Luteal Phase](https://fastingbestie.com/guides/fasting-during-luteal-phase/): Why shorter windows, earlier meals, and more food work better in the luteal phase. - [Why Fasting Feels Harder Before Your Period](https://fastingbestie.com/guides/why-fasting-feels-harder-before-your-period/): How the late luteal phase changes appetite, sleep, and stress tolerance, and what to do about it. ## Guides for different situations - [Can You Fast With an Irregular Cycle?](https://fastingbestie.com/guides/can-you-fast-with-an-irregular-cycle/): A gentler, symptom-led approach to fasting when cycles are unpredictable. - [When to Stop Fasting](https://fastingbestie.com/guides/when-to-stop-fasting/): The signs your fasting routine is too aggressive for your sleep, cycle, mood, or recovery. - [Intermittent Fasting for PCOS](https://fastingbestie.com/guides/fasting-with-pcos/): The evidence, the limits, and the safer way to approach fasting with PCOS (now also called PMOS). - [Is Intermittent Fasting Bad for You?](https://fastingbestie.com/guides/is-intermittent-fasting-bad-for-you/): When intermittent fasting helps women, when it can do harm, and how to keep it safe. - [Intermittent Fasting in Perimenopause](https://fastingbestie.com/guides/intermittent-fasting-perimenopause/): Why flexible windows usually work better than rigid fasting when sleep and cycle timing are changing. - [Intermittent Fasting After Menopause](https://fastingbestie.com/guides/intermittent-fasting-after-menopause/): How the priority shifts from cycle-syncing to protecting sleep, muscle, and metabolic health. ## Journal - [Journal](https://fastingbestie.com/journal/): Stories, science, and notes on cycle-aware fasting from the FastingBestie team. - [Welcome to the FastingBestie Journal](https://fastingbestie.com/journal/welcome-to-the-fastingbestie-journal/): A new home for stories, science, and notes on cycle-aware fasting. - [Building with promises](https://fastingbestie.com/journal/building-with-promises/): Why the team writes down its commitments before a line of code is written. - [Building the guard rails](https://fastingbestie.com/journal/building-the-guardrails/): How the app keeps fasting safe by design, with limits it holds for you and warnings before you go too far. ## Book reviews - [The 10 Best Intermittent Fasting Books](https://fastingbestie.com/journal/top-10-intermittent-fasting-books/): The ten best intermittent fasting books, reviewed and ranked, with the three best books for women at the top and a comparison table. - [The Essential Guide to Intermittent Fasting for Women (Megan Ramos)](https://fastingbestie.com/journal/intermittent-fasting-for-women-megan-ramos/): Review of Megan Ramos' clinical fasting manual rewritten for female hormones and life stages. - [Fast Like a Girl (Dr Mindy Pelz)](https://fastingbestie.com/journal/fast-like-a-girl-mindy-pelz/): Review of the book that popularised cycle-synced fasting, and where its claims outrun the evidence. - [Intermittent Fasting Basics for Women (Lindsay Boyers)](https://fastingbestie.com/journal/intermittent-fasting-basics-for-women/): Review of a gentle, beginner-friendly primer built around crescendo fasting. - [The Complete Guide to Fasting (Dr Jason Fung)](https://fastingbestie.com/journal/the-complete-guide-to-fasting/): Review of Fung and Moore's manual on therapeutic, intermittent, and extended fasting, and its limits for women. - [The Fast Diet (Dr Michael Mosley)](https://fastingbestie.com/journal/the-fast-diet-michael-mosley/): Review of the book that made the 5:2 method famous, and how to fit it to your cycle. - [The Fasting Fix (Dr Andreas Michalsen)](https://fastingbestie.com/journal/the-fasting-fix/): Review of a physician-scientist's evidence-based case for fasting as medicine. - [Life in the Fasting Lane (Dr Jason Fung and co-authors)](https://fastingbestie.com/journal/life-in-the-fasting-lane/): Review of the warm, real-world companion to making fasting a sustainable lifestyle. - [Intermittent Fasting For Dummies (Janet Bond Brill)](https://fastingbestie.com/journal/intermittent-fasting-for-dummies/): Review of a neutral, dietitian-written overview of every major fasting method. - [Intermittent Fasting Made Easy (Thomas DeLauer)](https://fastingbestie.com/journal/intermittent-fasting-made-easy-thomas-delauer/): Review of a tactical, fitness-focused guide to combining fasting with training. - [Why Fast? (Christine Baumgarthuber)](https://fastingbestie.com/journal/why-fast-christine-baumgarthuber/): Review of a cultural and historical study of fasting rather than a diet plan. ## About and policies - [Editorial Policy](https://fastingbestie.com/editorial-policy/): How FastingBestie creates and maintains its educational health content. - [Support](https://fastingbestie.com/support/): Frequently asked questions and how to contact the team. ## Optional - [Privacy Policy](https://fastingbestie.com/privacy/): How FastingBestie handles personal data. - [Terms of Service](https://fastingbestie.com/terms/): The terms that govern use of the app and site.