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Environmental health

PFAS is a topic to understand, not a number an app can give you.

daygauge cannot measure PFAS or infer it from phone data. You can log a related habit, such as changing your water filter, and compare it with your sleep and heart readings.

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The question

Start with what your own data can show.

People search PFAS because forever chemicals connect water, cookware, packaging and long-term health worries.

The honest approach is clear research context and an optional habit log, without pretending passive data can measure what is in your body.

Quick answer

daygauge does not measure PFAS or import test results. You can log a custom habit in Quick Log, such as filtered water, and see it next to your sleep, movement and heart readings.

Questions answered

What this guide covers.

  • What are PFAS forever chemicals?
  • Can an app track PFAS exposure?
  • What habits might affect PFAS exposure?
  • Can PFAS affect hormones?
  • Does daygauge measure PFAS?
In daygauge

How the app handles this.

Signal
daygauge does not infer exposure, fertility impact, hormone disruption or disease risk from a habit log.
Confidence
Missing readings lower confidence instead of creating false certainty.When a reading is not available, daygauge says so rather than filling the gap.
Weekly Review
Weekly Review shows what changed, what moved with it and whether the pattern repeated.Your first Weekly Review is free. Later reviews are part of Pro.
Illustrative example

What this can look like in the app.

Example: you logged filtered water on 12 days. Your sleep and heart readings sit beside them, with no PFAS level implied.

Example
Confidence

Confidence rises when the same pattern repeats against your own baseline and drops when key signals are missing.

Next move

Try one small change, log it, then see whether the pattern repeats over the next week.

Example 1

Example: you logged takeaway packaging on 4 days this week. daygauge shows the days and nothing more.

Example 2

Example: a PFAS blood test is something to discuss with a clinician. daygauge does not import or interpret it.

Research

Further reading.

These studies describe groups of people. They help explain the topic, but they cannot tell you what will happen to you.

Research context only. daygauge does not diagnose, treat, prevent or predict disease risk. Personal medical concerns belong with a qualified clinician.

Limits

What daygauge does not do.

  • It does not diagnose, treat or prevent disease, or predict your risk of it.
  • It does not claim one habit caused a result. It shows the pattern, how confident it is and what else changed.
Read next

Related guides.

Endocrine disruptors: what the research says and what an app cannot tell youMicroplastics are not part of the Life IndexA good health data app connects passive signals to daily decisions
On the App Store

Want to compare a habit with your sleep and heart readings?

daygauge is free to download. Pro is £8.99 a month or £49.99 a year.

Download on the App Store

Personal analytics, not medical advice