How research becomes understandable body guidance

BodySeasons turns checked research into guidance and analyses that stay understandable in everyday life.

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The foundation in numbers

Every one of these numbers is counted, not estimated. We do not promise anything we cannot back up.

298reviewed specialist sources. The foundation of our internal knowledge model.

96studies & meta-analyses. with explicitly documented sample sizes.

171,500participants. women, participants and couples across studies, NFP/Sensiplan and FABM data.

5age groups. A body at 18 responds differently than at 38 or during menopause.

13cycle profiles. From a natural cycle through hormonal contraception to menopause.

„Good answers begin with patient questions. That is how our knowledge model came about.“

Aurel

And because a single cycle day explains little on its own, sleep, mood, energy, bleeding and temperature are part of what BodySeasons puts into context.

What sits behind the recommendations

A curated knowledge model connects research with real life: cycle, age, contraception, menopause and your own observations.

Cycle day is the starting pointA cycle day can give direction, but it does not explain by itself why a day feels easy or difficult.

Age and profile change contextNatural cycle, hormonal contraception and menopause are not treated as the same situation.

Your entries make it more tangibleSleep, mood, energy and temperature show how your body is actually communicating today.

„Not every source carries equally far. We look at which one really supports you.“

Viva

From specialist knowledge to everyday guidance

Guidance comes from checked research, careful weighting and a gentle translation into everyday language.

1Check researchWe review scientific work on cycle, sleep, movement, nutrition and common body responses.

2Judge qualityNot every source carries the same weight. Studies, reviews and guidelines matter more than general web texts.

3Add body contextAge, cycle profile and logged signals help keep a statement from becoming too generic.

4Word it with careThe result is not a command or a diagnosis, but guidance that can support your day.

How we weigh sources

For us, it is not enough that a claim exists somewhere. What matters is how well it is supported.

Strongest: guidelines and reviewsWhen many studies have been evaluated together, or when an evidence-based guideline exists, that context carries special weight.

Next: peer-reviewed studiesIndividual studies matter, but we look at their context: what was measured, in whom, and whether it fits the claim.

Single findings need supportWhen only a few sources back a claim, we handle it more carefully internally and do not turn it into a hard truth.

Web texts are not enough aloneArticles online can offer clues, but they do not replace a scientific basis for BodySeasons.

Your body is more than a calendar date

Cycle days are useful, but they do not explain everything. BodySeasons also considers the signals you enter yourself. That applies to daily body-related guidance and to your analyses.

Sleep & energyRest, resilience and recovery can feel different depending on the phase.

Mood & stressEmotional patterns are not judged; they are treated as context.

Bleeding & temperatureBody signs can help show how a phase is currently presenting.

Sport & nutritionYour entries help make guidance more practical and less generic.

Hormone pattern plus real-life signal

What our analyses are built on

Our data foundation rests on the structured evaluation of peer-reviewed studies. We do not take them at face value: every source passes through our own assessment and weighting scheme before it becomes an everyday cue.

Among the largest studies and reviews we evaluated

42,684 womenNelson et al. (2023)

Fertility and Sterility, 42,684 women, age- and contraceptive-specific AMH reference values.

17,120 womenSeifer, Baker & Leader (2011)

Fertility and Sterility, 17,120 women, age-specific AMH values.

9,704 womenBauer et al. (2001)

Annals of Internal Medicine, 9,704 women, thyroid and bone health.

Cycle observationFrank-Herrmann et al. (2007)

Human Reproduction, the Sensiplan study by the NFP working group on cycle observation.

27,125 womenVennberg Karlsson et al. (2021)

Acta Obstetricia et Gynecologica Scandinavica, 27,125 women, AMH under hormonal contraception.

15,277 peopleBoucai, Hollowell & Surks (2011)

Thyroid, 15,277 people, thyroid (TSH) reference ranges.

Long-term cohortSWAN cohort (Randolph, Sowers, Santoro et al.)

estradiol and FSH across the menopausal transition.

Our value is the interpretation, not the collection

Each study is graded by quality, matched against 13 cycle profiles and 5 age groups, and only then translated into an understandable cue. That turns around 300 individual sources into a consistent picture rather than a list of citations.

Last reviewed: June 2026 · BodySeasons does not provide diagnoses and is not a substitute for medical advice.

„We do not collect what is loud. We keep what holds.“

Aurel

A woman reads in her study full of books in the early evening, outside the sky glows in rose and gold.

Openly explained without exposing the specialist model

We do not publish the complete source list.
We do not show internal hormone values, weightings or rule boundaries.
We do not diagnose and do not replace medical advice.
We still explain clearly why our guidance and analyses are not based on guesswork.

Ready to understand your body better?

Start for free and see how research, logging and everyday life come together in BodySeasons.

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