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And initially, they determine our\ncyclicity too. But just as weight fluctuates due to outside factors, the\nmenstrual cycle will also vary in response to changes in age and weight.*\n\nAs scientists, we are aware how important is to have a good data pool to\nexplore. Accurate information will enable us to make the predictions\nincreasingly specific and applicable to more than period and PMS.\n\n**This is why we added age, height and weight into Clue’s new “About You”\nprofile. These facts about you will bring Clue to the next level of precision.**\n\nAge and [BMI](https://en.wikipedia.org/wiki/Body_mass_index) (body mass index)\nwill have a major impact on your cycle. They will modify the cyclicity blueprint\nencrypted in our genes. Our genetically predetermined clock will dictate how\nfast and long we dwell in each of the different life stages (adolescence,\nadulthood and menopause), but our lifestyle habits can modify, extend or shorten\neach stage.\n\n**Our genes can also be seen as a framework, into which our life habits leave\ndents. The combination of the two shape our menstrual experiences on a daily,\nmonthly and yearly basis.**\n\nThere is a greater probability for us to initially share similar cycle profiles\nwith our biological ancestors, siblings and progeny. But it is also interesting\nto see how the cycles will differ, and to understand does the difference come\nfrom the lifestyle, genetic combinations/mutations that happened for the first\ntime in our family tree.\n\nThat is where knowing our current lifestyles and analyzing our cyclicity against\nthe backdrop of our age, BMI and life habits comes in handy. Individuals with a\ncombination of similar life styles and age might also experience similar cycles.\n\nOur Medical Advisor, Dr. Aparna Sridhar explains:\n\n> *“Menstrual cycles do change with women’s age! With menarche, menstrual cycles\n> are usually heavy and irregular for the first few years in some women. Over the\nlate teen and 20s the cycles become more regular. Menstrual cycles are shortest\nand have the least variability for women in 30s. As women enter their 40s, the\nloss of ovarian follicles results in increasing length of menstrual cycle. Once\nall the ovarian follicles are depleted, women enter menopause and menstrual\ncycle ends.”*\n\nThe second very important category is BMI (body mass index) . It is known to\nimpact regularity of the period. Both extremes — underweight and\noverweight/obese — can lead to variations in the menstrual cycle due to\nde-regulation of hormonal pathways. However, even the smaller changes in weight\nnot placing us in another [BMI\nzone](https://www.nhlbi.nih.gov/health/educational/lose_wt/BMI/bmi_dis.htm) may\nbe strong enough to cause shifts in our hormones and as a consequence changes in\nour cyclicity.\n\n> *“Changes in body weight can change menstruation patterns. We know that extremes\n> of body mass index are associated with changes in menstrual cycle patterns and\nfertility patterns. A minimum proportion of body weight is needed to initiate\nmenstrual cycles and maintain them. Thus, women who lose too much weight or are\nunderweight can have changes in menstruation including but not limited to\ncessation of menstruation or prolonged periods of amenorrhea. Also, excess body\nweight and body fat is associated with irregular and heavy menstrual cycles.\nWomen who are obese have higher chance of menstrual cycle disorders compared to\nthose who have normal body mass index. Conditions such as polycystic ovarian\nsyndrome are common in obese women.” ***-**Dr. Sridhar\n\n**Approximately 50% of the world’s population menstruates.** Organizing this\nhuge sample by age, weight and lifestyle will allow Clue to provide more\nvaluable personal insights.\n\nProviding predictive insights for different groups will help the “newcomers,”\ntransitioning life stages, to faster understand how reproductive health will\nlook in the next 1–5 and ten years. Yes, our physiology is not a static thing,\nwe should take active care of it.\n\nIt is a long time span, and we do want to understand our cyclicity. For many\nreasons, some of them you know today, the rest we will learn on the way."},"bodyRichText":null,"references":null,"partnerships":null,"relatedArticles":null,"articleFooterDownloadWidgetText":null},"recommendedArticles":{"edges":[{"node":{"id":"3CSH7QXYlyCCmIakmWSweM","title":"How travel and jet lag can affect your period","slug":"cycle-a-z/how-travel-jet-lag-can-affect-your-period","snippet":"Traveling across time zones can throw your hormones — and your menstrual cycle — out-of-whack.","locale":"en","publishDate":"2016-05-12T00:00+01:00","authors":[{"id":"53XXDZWUHSYKw4IQukGcG","name":"Anna Druet, BA","headline":"Science writer","slug":"anna-druet","twitter":null,"locale":"en","profileImage":{"id":"hOkf6TtNjqK8cwKY6uk0O","description":"portrait of anna 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