{"id":24457,"date":"2026-06-06T08:00:00","date_gmt":"2026-06-06T13:00:00","guid":{"rendered":"https:\/\/naturalwomanhood.org\/?p=24457"},"modified":"2026-06-02T09:03:34","modified_gmt":"2026-06-02T14:03:34","slug":"%d0%b8%d1%81%d1%81%d0%bb%d0%b5%d0%b4%d0%be%d0%b2%d0%b0%d0%bd%d0%b8%d0%b5-%d1%81%d0%b8%d0%bd%d1%85%d1%80%d0%be%d0%bd%d0%b8%d0%b7%d0%b0%d1%86%d0%b8%d0%b8-%d1%86%d0%b8%d0%ba%d0%bb%d0%be%d0%b2","status":"publish","type":"post","link":"https:\/\/naturalwomanhood.org\/ru\/cycle-syncing-study\/","title":{"rendered":"\u0427\u0442\u043e \u043d\u0443\u0436\u043d\u043e \u0437\u043d\u0430\u0442\u044c \u043e \u043f\u0435\u0440\u0432\u043e\u043c \u0432 \u0438\u0441\u0442\u043e\u0440\u0438\u0438 \u043a\u043b\u0438\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u043c \u0438\u0441\u043f\u044b\u0442\u0430\u043d\u0438\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0446\u0438\u043a\u043b\u043e\u0432"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Results of a first-of-its-kind research study on cycle syncing were released by FLO Living in spring of 2026. As early as 30 days into the study, a majority of participants reported fewer and less severe PMS symptoms, especially regarding mood, energy, and blood sugar control. These benefits increased by 60 days and remained consistent at 90 days.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Due to significant limitations, the study probably won\u2019t convince cycle syncing skeptics, but it will likely shore up support amongst the live-in-harmony-with-your-hormones faithful. It may even encourage the rest in the middle to give it a shot.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-cycle-syncing\"><span id=\"what-is-cycle-syncing\">What is cycle syncing?<\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FLO Living founder and author of <a href=\"https:\/\/naturalwomanhood.org\/natural-womanhood-book-review-in-the-flo-by-alisa-vitti\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em>In the Flo<\/em> <\/a>and <em>WomanCode<\/em> Alisa Vitti developed the <a href=\"https:\/\/www.cycle-syncing.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Cycle Syncing\u00ae Method<\/a>, which promises to help women \u201csync your nutrition and fitness with your cycle to optimize your weight, energy, mood, and productivity.\u201d According to <a href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0706\/2831\/1345\/files\/The_Impact_of_The_Cycle_Syncing_Method_on_Symptoms_Associated_With_the_Menstrual_Cycle_Over_Three_Months_-_FINAL_2026-v4_compressed.pdf?_kx=bXgXbhwGqjaCytOchmniQSEvJGVFGwlXHS4j8rfey-o.KrUEcB&amp;type=Flow&amp;utm_campaign=Email%20%231%20%28TDMNbk%29&amp;utm_medium=email&amp;utm_source=Cycle%20Syncing%20Study%20Whitepaper&amp;v=1773101267\" target=\"_blank\" rel=\"noreferrer noopener\">FLO Living<\/a>, the company Vitti founded, \u201cThis method is designed to reduce symptom burden and severity across the menstrual cycle by optimizing insulin and cortisol balance, thereby enhancing progesterone production and promoting effective estrogen metabolism through a flexible lifestyle approach.\u201d We know that over the course of the cycle, <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC8554369\/\" target=\"_blank\" rel=\"noreferrer noopener\">estrogen<\/a> shifts do in fact affect blood sugar levels and <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0091302224000402\" target=\"_blank\" rel=\"noreferrer noopener\">progesterone<\/a> can impact mood, as just one example. But, to date, we lacked evidence on whether specific interventions could lead to symptom improvement (let alone identifiable hormone level changes).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Since the method\u2019s introduction via <em>In the Flo<\/em> in 2020, cycle syncing as a broader concept has rapidly gained popularity in <a href=\"https:\/\/www.youtube.com\/watch?v=cvyQWrWlRkU\" target=\"_blank\" rel=\"noreferrer noopener\">wellness circles<\/a>, with many <a href=\"https:\/\/naturalwomanhood.org\/nw-reviews-lively-app-cycle-syncing\/\" target=\"_blank\" rel=\"noreferrer noopener\">spinoff<\/a> <a href=\"https:\/\/naturalwomanhood.org\/28-app-review\/\" target=\"_blank\" rel=\"noreferrer noopener\">apps<\/a> <a href=\"https:\/\/support.whoop.com\/s\/article\/Menstrual-Cycle-Coaching?language=en_US\" target=\"_blank\" rel=\"noreferrer noopener\">launched<\/a> in the last few years. Vitti herself has been profiled by mainstream outlets like <a href=\"https:\/\/www.nytimes.com\/2019\/12\/04\/style\/self-care\/flo-living-pcos-periods.html\" target=\"_blank\" rel=\"noreferrer noopener\"><em>The New York Times<\/em><\/a>.\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-results-from-the-first-ever-cycle-syncing-research-study\"><span id=\"results-from-the-first-ever-cycle-syncing-research-study\">Results from the first-ever cycle syncing research study<\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In 2025, FLO Living announced that it had received institutional review board approval for a three-month trial to test whether the Cycle Syncing\u00ae Method reduced PMS symptoms.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Results from that trial were released in a spring 2026 <a href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0706\/2831\/1345\/files\/The_Impact_of_The_Cycle_Syncing_Method_on_Symptoms_Associated_With_the_Menstrual_Cycle_Over_Three_Months_-_FINAL_2026-v4_compressed.pdf?_kx=bXgXbhwGqjaCytOchmniQSEvJGVFGwlXHS4j8rfey-o.KrUEcB&amp;type=Flow&amp;utm_campaign=Email%20%231%20%28TDMNbk%29&amp;utm_medium=email&amp;utm_source=Cycle%20Syncing%20Study%20Whitepaper&amp;v=1773101267\" target=\"_blank\" rel=\"noreferrer noopener\">white paper<\/a> by <a href=\"https:\/\/floliving.com\/pages\/cycle-syncing-results\" target=\"_blank\" rel=\"noreferrer noopener\">FLO Living<\/a>, which reported that 92% of participants experienced significant improvement in PMS symptoms after just 60 days of use [1]. According to a <a href=\"https:\/\/floliving.com\/pages\/cycle-syncing-results\" target=\"_blank\" rel=\"noreferrer noopener\">press release<\/a>, 81% of participants reported fewer PMS symptoms, 94% felt their blood sugar was steadier, and 89% perceived mood improvements. What\u2019s more, these benefits continued at 90 days.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Perhaps most reassuringly, according to the white paper, these results were achievable without perfect compliance to the MyFLO app personalized daily exercise and nutrition recommendations. In reality, users achieved approximately 72% adherence to the five daily activities (breakfast, lunch, and dinner recommendations, along with suggested exercise and focus activity).&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-study-limitations\"><span id=\"study-limitations\">Study limitations<\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If it all sounds too good to be true, it might be. As always, the devil is in the details, and the FLO living study results are markedly less impressive under scrutiny.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-many-participants-dropped-out\"><span id=\"many-participants-dropped-out\">Many participants dropped out<\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">First of all, there were just 60 participants (aged 22-42) to begin with, but more than one-third had dropped out by the end of the three-month-long trial, with no explanation as to why this might have been the case.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-no-control-group-for-comparison\"><span id=\"no-control-group-for-comparison\">No control group for comparison<\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Additionally, there was no control group. Ideally, the study would have compared PMS symptoms in women who practiced cycle syncing to PMS symptoms in women who did not, to explore whether PMS symptoms may ebb and flow naturally over time.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-no-mention-of-objective-health-data-from-urinary-hormone-monitor\"><span id=\"no-mention-of-objective-health-data-from-urinary-hormone-monitor\">No mention of objective health data from urinary hormone monitor<\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Additionally, while study participants utilized continuous glucose monitors from Hello Inside, and urinary <a href=\"https:\/\/naturalwomanhood.org\/femtech-device\/\" target=\"_blank\" rel=\"noreferrer noopener\">hormone monitors from Mira<\/a>, along with the MyFLO app cycle syncing recommendations for cycle phase-specific eating and exercise, the white paper made no mention of what data were tracked with Mira, nor what the results were.\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-continuous-glucose-monitor-data-didn-t-show-improvements-after-cycle-syncing\"><span id=\"continuous-glucose-monitor-data-didnt-show-improvements-after-cycle-syncing\">Continuous glucose monitor data didn\u2019t show improvements after cycle syncing<\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Furthermore, while participants reported \u201cfeeling\u201d that their <a href=\"https:\/\/naturalwomanhood.org\/blood-sugar-menstrual-cycle\/\" target=\"_blank\" rel=\"noreferrer noopener\">blood sugar levels<\/a> were more stable, Hello Inside scores of blood sugar control <em>remained essentially unchanged<\/em> from baseline to the end of the study.\u00a0\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-overreliance-on-user-perception\"><span id=\"overreliance-on-user-perception\">Overreliance on user perception<\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In fact, the study\u2019s emphasis on user perception is arguably its biggest limitation. Questions were written to ascertain \u201cfeelings\u201d about health more so than to obtain objective measures of health. For instance, participants were asked after 30, 60, and 90 days, \u201cDid you feel like your blood sugar was more stable this way (syncing meals with cycle phase)?\u201d \u201cDo you feel like you have more consistent energy?\u201d \u201cAre you happy with how your body looks\/feels after this month?\u201d \u201cHow satisfied are you with your overall hormonal health now?\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certainly, when it comes to PMS in particular, <a href=\"https:\/\/naturalwomanhood.org\/the-period-brain-review\/\" target=\"_blank\" rel=\"noreferrer noopener\">perception of symptoms is very important<\/a>. But when subjective and objective data don\u2019t agree, as in the example above of participants \u201cfeeling\u201d that their blood sugar control was better even though it was <em>not<\/em> objectively better, the efficacy and value of cycle syncing are called into question.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-pullquote\"><blockquote><p>When subjective and objective data don\u2019t agree, as in the example above of participants \u201cfeeling\u201d that their blood sugar control was better even though it was <em>not<\/em> objectively better, the efficacy and value of cycle syncing are called into question.&nbsp;<\/p><\/blockquote><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-4-criticisms-of-cycle-syncing\"><span id=\"4-criticisms-of-cycle-syncing\">4 criticisms of cycle syncing<\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Amidst its growing popularity, cycle syncing has not been without its <a href=\"https:\/\/time.com\/6315797\/cycle-syncing-womens-heath\/\" target=\"_blank\" rel=\"noreferrer noopener\">detractors<\/a>. Critics point out that the minimal research cited by cycle syncing apps to support the idea that <a href=\"https:\/\/naturalwomanhood.org\/menstrual-cycle-athletic-performance\/\" target=\"_blank\" rel=\"noreferrer noopener\">athletic performance<\/a> and <a href=\"https:\/\/naturalwomanhood.org\/workout-injuries-menstrual-cycle\/\" target=\"_blank\" rel=\"noreferrer noopener\">injury risk<\/a> vary by cycle phase, is:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Very new, less than five years old<\/li>\n\n\n\n<li>Often based on elite female athletes rather than average women<\/li>\n\n\n\n<li>Survey-based assessments of user perceptions, rather than an objective measurement of data\u00a0<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Critics also cite, as one example, a <a href=\"https:\/\/physoc.onlinelibrary.wiley.com\/doi\/10.1113\/JP287342\" target=\"_blank\" rel=\"noreferrer noopener\">small 2025 study<\/a> finding that healthy young women\u2019s muscle protein production didn\u2019t differ meaningfully between the follicular and luteal phases (of note: this study did accurately identify participants\u2019 cycle phases with urine and blood tests, whereas previous research often used calendar estimates to predict cycle phases) [2].\u00a0\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-bottom-line\"><span id=\"the-bottom-line\">The bottom line<\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Women who struggle with PMS have nothing to lose by trying out cycle syncing, but results from the first-ever research trial of the Cycle Syncing\u00ae Method are unclear on how much they can reasonably expect to gain. More research is needed to assess how hormonal levels, as one example of an objective biomarker, do or do not improve in response to cycle phase-specific nutrition and exercise adjustments. We commend FLO Living and fellow femtech companies Mira and Hello Inside\u2019s efforts to honor and support women\u2019s natural hormonal rhythms, and look forward to future, more rigorously conducted research.&nbsp;&nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-references\"><span id=\"references\">References<\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">[1]&nbsp;The Impact of The Cycle Syncing Method on Symptoms Associated With the Menstrual Cycle Over Three Months. Flo Living, single group study.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[2] Colenso-Semple, L.M., McKendry, J., Lim, C., Atherton, P.J., Wilkinson, D.J., Smith, K. and Phillips, S.M. (2025), Menstrual cycle phase does not influence muscle protein synthesis or whole-body myofibrillar proteolysis in response to resistance exercise. J Physiol, 603: 1109-1121. https:\/\/doi.org\/10.1113\/JP287342<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"\u0422\u0430\u043a \u043b\u0438 \u043e\u043d \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u0435\u043d, \u043a\u0430\u043a \u0441\u0447\u0438\u0442\u0430\u044e\u0442 \u0443\u0447\u0430\u0441\u0442\u043d\u0438\u043a\u0438?","protected":false},"author":85,"featured_media":24458,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","csco_singular_sidebar":"","csco_page_header_type":"","csco_page_load_nextpost":"","csco_post_video_location":[],"csco_post_video_url":"","csco_post_video_bg_start_time":0,"csco_post_video_bg_end_time":0,"footnotes":""},"categories":[5290],"tags":[5591,4387,4423],"class_list":["post-24457","post","type-post","status-publish","format-standard","has-post-thumbnail","category-health-benefits-of-fam","tag-cycle-syncing","tag-fam","tag-nfp","cs-entry","cs-video-wrap"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v28.0) - 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