Why does my smart scale (Fitbit Aria 2) show a 1.5kg weight drop every morning?

i noticed every morning my Fitbit Aria 2 drops ~1.5kg compared to night. initially i thought it was a calibration issue. but after checking, the device uses BIA and is sensitive to hydration levels. this tiny shift reminds me that weight is not a fixed entity—like the concept of self in philosophy. each day we are a new iteration, not a static state. the 1.5kg drop is like a reminder that progress is incremental, not instantaneous. it also teaches me to focus on trends, not single data points.

here are a few takeaways:

• treat daily readings as a time series, not a snapshot.
• understand BIA's 2‑5% error margin.
• use trend charts over a 30‑day window.
• pair weight data with other metrics like HRV, sleep quality.
• accept that small fluctuations are part of the journey.

this is akin to the Buddhist concept of impermanence—what we measure today is not what will be tomorrow. so instead of chasing a perfect number, embrace the flow.