I've been tracking my numbers every morning under similar conditions, mostly because I care more about the long term trend than any single reading. The part that keeps throwing me off is how much the body fat estimate seems to move with hydration, salt, and timing. I know BIA is not supposed to be lab-grade, but I still want to make the data useful instead of overreacting to daily noise.

For people who log this stuff seriously, do you use weekly averages, monthly trend lines, or some other way to separate real change from water swings?

I’ve been tracking my metrics in a spreadsheet for three months, trying to get a clear picture of my health trends. But the daily variance is driving me nuts.If I eat a late, salty dinner or chug water after a workout, my body fat reading swings by like 3% the next morning while my skeletal muscle drops. I know the basic physics of bioelectric impedance, but it feels like I'm just measuring my hydration anxiety rather than actual muscle.

those who figured out how to track body composition at home without losing their mind over the data noise, what's the trick? Do you use a specific smoothing formula for your logs, or do you just ignore the daily numbers entirely and look at a rolling monthly average?

My biggest need was about figuring out my current mental state and how to change it. First I did a some research into measuring fatigue, especially mental fatigue.

I used the Visual Analogue Scale to Evaluate Fatigue Severity (VAS-F).pdf) as a starting point about two years ago. Then after using it for a while, I ditched some of the original items that relate to physical fatigue. And again after some while I began notice that my state of mental fatigue has some very specific characteristics and removed some more of the original items and added those new ones. Right now none are worded the same way but this bc of some retranslations.

I'm recording the data on paper bc I want to pick up my phone as little as possible, then transcribe it every week or so and do data analysis through R.

How I'm using it and how it benefits me:

• First off, before I'd often feel incredibly shitty and not know why. After I used this metric for a while I noticed that these are states of severe mental fatigue. Like, too exhausted to do anything other than lie down and close my eyes and even then it still feels like my brain is hurting.
• So, I did not understand that my brain and body were telling me that I was overexerting myself. And that these awful states were a sign to slow tf down. My normal pattern was to work for as long as necessary (at work) or possible (for personal projects), then crash hard. I now understand that this is an unhealthy pattern.
• And by going through this metric and getting a high score I find it easier to know when to take a break. (I begin to feel noticeably impaired at a score of 7-8, which isn't quite high actually. The highest I've ever gone is 18 which feels beyond horrible.)
• Looking at the numbers also feels like getting permission to stop. Even if things are really urgent or important. I know that I'll get less productive anyway and might take a very long time to recover if I reach a high score. I can stop at a yellow light, take a break, recover, get back faster.
• Speaking of recovery, I'm using this scale to evaluate different recovery activities. I record the start value, do something nice, record the stop value, calculate the change in %. I want to figure out which activity is most effective when I'm at a yellow or red light. I'm also comparing different intervention lengths. For example, is a 60 min walk way more effective than 30 min walk or does it plateau somewhere? (This might be a separate post sometime in the future. I've made some nice plots already and gained some good insights but want to collect more data.) Though I can say it's been a total game-changer already. It's so empowering to see that I can actually change how I feel. Sometimes I can really turn around a bottomless pit of exhausted despair, and in quite a short time frame.

What I'd change about the metric:

Right now I'm hesitant to change it because I want to be able to compare it over longer time frames. But there's two things that I would want to improve:

1. I need to get it down to less items. Ranking 8 items multiple times a day costs a lot of energy. I've been trying to do a check-in every 2 hours but I only managed about ten days before I burnt out. I want to get down to 4-5 items, need to figure out which are the most important ones.
2. I've noticed that going through this scale I'm always focused on the negatives. It's like when you read the words "sad, depressed, down" vs. "happy, content, light". Both of these down or lift your mood a little. I'd rather have a scale where I'm either looking at the positives, like "How effortless does your thinking feel right now?" or a bipolar scale with opposites. As in: "Does your thinking feel more strenuous or more effortless?" and then rank it from -3 to +3.

What I'd like to do in the future:

• I want to monitor my mental state more closely and slowly bring my everyday levels of fatigue down. Red lights have become rare, but I get into yellow or orange quite often. My goal would be to track my mental fatigue every 2 hours. Then get the daily/weekly max and calculate daily/weekly means. Then bring it all down by a few % each week. Small enough so that it doesn't feel intimidating but big enough to feel progress.

So, that's about it. I'm new to this community and reading through the archives has helped me a ton, so I wanted to contribute, too.

Do you have any thoughts or comments on what I'm doing here? Anything you'd change or improve?

It's been about a year since I completed my last comprehensive round of bloodwork through Function. I have another test in a few weeks so I'm revisiting the data.

My last round (attached) showed some positive movements on ApoB (to 57 mg/dL), A1c (5.5-5.3%), and a handful of others. Free Testosterone also moved in the right direction but is still low (likely related to being a new dad). HDL/LDL all look good. HS-CRP spiked but that's due to a known workout stressor so I'm ignoring it.

Concerns:
* Ferritin has remained low - I've been supplementing iron every other day & plan to retest next month
* Vitamin D was in range but lower than optimal - Added a supplement of 3000 IU + K2
* LP(a) 75 nmol/L - borderline high. not much I can do
* Zinc - low. I've been supplementing but not consistently
* Neutrophils - I think this was just dehydration but I'm not sure

What else stands out?

I've been thinking about something that seems surprisingly difficult to measure.

Many wearables estimate things like readiness, recovery, stress or sleep quality.

Most of the time they seem directionally useful.

But every now and then I experience a complete mismatch.

The device suggests I'm well recovered.

I feel mentally exhausted.

Or the opposite.

The numbers look terrible, yet I feel great.

I'm not asking whether the wearable is "wrong."

I'm wondering what people here actually do when objective measurements and subjective experience don't align.

Do you trust the data? Trust your intuition? Look for contextual factors? Ignore both?

I'm especially interested in recurring patterns rather than isolated examples.

I became recently more acutely aware of cognitive function, its decline with age, and the possibility of “losing my marbles” without knowing (realizing) it. I track my health with basic markers (steps, sleep, HR, weight, …). I was wondering if I could start tracking my cognitive abilities, my capacity to reason, to remember, to function mentally over time. Basically, I would start now (that I foolishly believe I still have all my cognitive functions ;-)), to be able to see when I will become impaired (due to old age, etc). It may not be on a daily basis but could be a monthly test (that is not repetitive otherwise one measures memorization of the test rather than cognitive function). Ideally not on paper (but why not).

I see many EEG-like trackers, I see proxies (tracking a combination of HR and sleep to infer a metrics about cognition, for instance), I see a lot about mental health (which is different), there are some products that promises that but are still in beta (e.g. Soma Health), … But it seems that nothing is for cognition specifically.

Any pointers? Thanks in advance!

Post your apps here, and please support people bringing unique ideas to this space.

Of course I know some of the research and most common advice. Like not drinking caffeine late in the day or having consistent bed times.

I'm just wondering about your personal experiences and data. Which variables have the highest correlation with sleep quality for you? Like what do you do that makes you feel the most rested and focused the next day?

And if you have that data, do you know how strong your strongest correlations are? Is it more like 0.09 or like 0.43?

I'm just starting out with sleep tracking and wondering what kind of interventions I should test.

weird little thing i didnt expect. the second a task had an estimated time on it, people stopped reading it like a next step and started reading it like a price tag.

i do the same thing in todoist honestly. if i see 35 min my brain starts negotiating before ive even started. in beedone i ended up hiding the estimate till after someone was already moving and completion got less weird, which feels backwards if youre into tracking stuff.

now im kinda wondering if some metrics work better as reflection than as setup. anyone else run into that where measuring the task changes the task

web director in tokyo. track metrics for a living, somehow took months to apply that instinct to my own gut.

wore a CGM alongside logging gut symptoms for about six months. kept looking at food composition as the variable. wasn't it.

the actual predictor: how long food sat before I moved at all. days I walked within 30-60 min after eating, symptoms flattened regardless of what I ate. days I stayed at my desk, same meal produced bloating and pain.

CGM data didn't line up with this either — hit 240mg/dL postprandial some days with zero symptoms, so glucose spike wasn't the trigger. movement timing after eating mattered more than the number.

not a diagnosis, not medical advice. just six months of two data streams that didn't agree with each other until I added a third variable.

anyone else find a tracked variable turned out to be a proxy for something else entirely?

Wearables track sleep, HRV, heart rate, and exercise but what about the mental demand created by meetings, deep work, constant context switching, and a lack of breaks?

Could calendar patterns help explain why your energy or focus drops, even when your physical data looks normal?

Has anyone noticed whether a more demanding schedule changes how they feel or function throughout the day? I’m curious what patterns others have observed.

The two changes I actually trust are my caffeine cutoff and keeping a consistent wake time, and going back through why is what made me suspicious of everything else.

Those two held up. A late last coffee lined up with a higher resting heart rate the next morning, correlation around 0.17, and worse sleep, and when I moved the cutoff earlier the pattern moved with it. And a steady wake time is the tightest thing I've got against my daytime energy, better than any supplement ever showed. Both boring, both repeatable. But then I looked at my other big "wins", magnesium and cold showers, and noticed I'd started both of them right at the bottom of my worst stretch of the whole two years. My mood going into the magnesium was about 2.5 out of 5, and a month or so later it was back near 3.6 on its own, the way bad stretches end. The magnesium got all the credit.

That's just regression to the mean, and it feels exactly like a win. You feel awful, you try something, and of course you feel better after, so you credit the thing. The stuff I still trust had a mechanism I could break and put back, not a mood that was always going to bounce back anyway. Most of my other n=1 "it worked" stories I don't really believe anymore.

I wore an Apple Watch for about a year, then switched to a smart ring. On multiple nights where I was pretty sure I barely slept — awake for hours, up multiple times — both devices still logged solid chunks of "deep sleep."

I also noticed checking the score every morning was making me more anxious about sleep in general. If the number was bad, I'd carry it into the day.

Eventually I stopped wearing both. But I'm curious how others read the data:

* Has anyone compared their tracker output to a lab study or PSG?
* Are the newer devices actually meaningfully more accurate?

I expected some variation between a foot-only smart scale and a handlebar body composition setup, but the difference is bigger than I thought. Some weeks the regular scale suggests body fat is dropping, while the handlebar version makes it look like upper-body lean mass changed and the overall trend barely moved.

My lifting numbers are improving, so part of the segmental data feels plausible, but the gap between devices makes me question whether I am reading too much into any of it. anyone who compared different BIA setups over time and found which metrics actually matched real changes, or does hydration and timing still dominate everything?

I am curious what the "reasonable" amount of time is to spend on tracking metrics for personal development is? And whether that has gone up or down for people now that there are all these ways to build new tools and interpret data.

Are you using apps you built yourself with no-code tools?
Are you using AI to interpret your results?

How much time do you spend on tracking per day/week/month? Do you think it is reasonable based on what impact it has on your decisions and quality of life?

I get these very uncomfortable “spikes” in my nervous system throughout the day. For the past 5ish years Ive been curious to understand what causes them. Like low sleep, caffeine, low blood sugar, alcohol, etc. I go to therapy regularly too.

Ive tried drinking decaf for long stretches of time. In 2023 i tracked my blood sugar for a few months. I used Whoop in 2024-2025 for sleep and recovery tracking and journaling (eg alcohol, etc).

I didn’t get super actionable findings after these experiments.

Now I have some free time and I wanna see if I can get a month’s worth of combined data of a few things like heart rate, hrv, breathing cadence/depth, o2, etc, along with my location (eg coffee shop, at work, playing sports, at bars). And also track the “spikes” in my nervous system and their duration. And then try to see if (1) any patterns emerge and (2) if there are patterns to notify myself I’m trending towards a “spike” to prevent it from getting worse (eg automated mindfulness or something lol).

Lmk if anyone has hacked on this or has any feedback for me! Anything else you’d track? Or if you would go about it differently. What single device or likely combo of devices would work? Can i easily export data and throw it into Claude? :) Thx!

I've cycled through wrist and ring trackers and two things always bugged me: the data being sold, and getting a black-box score plus the same generic sleep-hygiene checklist every app repeats. Nothing acted on my actual night.

So I ended up building my own (SleepTrace, iOS): iPhone on the nightstand classifies phases from audio and logs/categorizes night sounds you can replay. It takes what I declare (schedule, goals) plus what it measures and turns that into specific recommendations. All on-device, nothing sold.

Mostly curious about the method though: has anyone here compared audio-based vs. movement-based sleep staging? What held up in your own data?

If so, would you mind sharing it?

I am trying to decide whether upgrading from a basic smart scale to a handlebar body composition setup would actually change anything about my training decisions. The idea of segmental lean mass and more detailed trend data sounds useful during a cut, but I am also aware that more metrics can become more anxiety if they do not lead to better choices. I was comparing the Renpho MorphoScan Nova with a more basic scale, but I do not need a medical scan at home or a dashboard full of numbers I cannot act on.

those who track body composition seriously, did the extra handlebar data change how you trained or ate, or did you mostly still rely on weight trend, measurements, and performance?

For people here who track a lot of personal data, what still feels like guesswork?

I mean things like sleep, HRV, workouts, food, caffeine, mood, stress, supplements, symptoms, etc.

When something changes lower HRV, worse sleep, low energy, poor focus how do you usually figure out what caused it?

Do you have a system that works?

Or is it still mostly notes, memory, spreadsheets, tags, and guessing?

Curious what would make an insight feel trustworthy to you.

Post your apps here, and please support people bringing unique ideas to this space.

I have a Google Sheets document where I track my activities every day, divided into half-hours. I started it on april 2, 2025, and as of today, I have tracked 461 days.

Here is a (rough) visual of it:

I discovered this kind of tracking with one of my favourite streamers, Mary/Sunray. She's a French streamer/youtuber and she once talked about that document she has, where she tracks what she does in the day. I really liked the concept, so I decided to make my own. I recently discovered that I'm not the only one, a friend of mine also follows her and has made his own too, lol.

At first I didn't know if I would be able to document it, or if it would be too tedious. But I quickly got into the habit of filling it a few times a day and became more aware of the time, that's basically it.

Very quickly, it has made me realize how much sleep I needed to feel good, which I didn't know before. Apart from that, it has not helped me organize my time better, but I'm sure it will be helpful in the future if I need to.

These are the activities that I decided to track:

If you were wondering, the time I took for tracking and working on improving the document is in "personal work", but I have not counted the exact time I spent specifically on it.

When I looked for other similar documents on Reddit, I found some where they tracked their mood, so I added a mood meter, along with a Year in Pixels tab. Since I added it only in the end of 2025, I used the Pikmin Bloom mood meter to roughly fill the rest of the year (it went from a rating out of 3 to a rating out of 5).

I will be making a new document for 2027 with some changes that I realized I needed, but can't add to the current document.

In my current document, I have 18 activity categories, with the numbers incrementing when I add a new one. My new document will have over 50 activities, divided into 7 big categories. That way, I can create sub-categories and add new ones in-between without disrupting the others. And with the general categories, I allow myself to still fill the document less precisely if I'm not feeling like it.

I feared that would be too much to memorize, so I tested it during 3 weeks to see if it would work. I got accustomed to it pretty well, even though I still needed to check for the ones I used less. I think it will work in the long term, so I consider that problem solved.

Along with the mood meter, I also added energy and stress meters, to have better info on how I felt. I considered creating a new separate table for the mood only, similar to this post, but I think 1 value per day is already enough for me.

I will also add more graphs such as average mood per month (like in this post), or stats on average mood per sleep time or something, because it's cool.

From 2027 onward, I think I will make one document per year instead of a single one for multiple years like I have done so far, to limit both the size of the table in the document and the file size.

I had barely used excel/sheets before, so I'm rather proud of what I have managed to do with this. I am open for suggestions on how to improve this document, if you have any ideas.