S2 Body Fat not accurate

I think it kind of proves the point that it doesn’t work when you’re doing body recomp. Exactly what I did. 210 lbs to 182lbs all fat loss as proved by dexa scans. But scales measured equal fat and muscle mass loss despite clear muscle gains. Basically as I’ve said in every thread it’s a BMI calculation that uses the activity level to flex the BF figure and it’s completely rubbish 

What’s the alternative? I’m a Garmin user on most of my other fitness and health trackers/ devices.  Withings seems to be getting better reviews and is cheaper.  What do people think?

I switched to a withings body cardio scale. I'm happy with its performance, gives me readings very close to my calipers which have always been accurate.

If you're tech savvy there is even a way to push the withings data into the garmin app which I have done and it works great.

The reason I went with a garmin scale is to have everything in one app and now I have that, I'm sticking with withings for BF measurements even if Garmin bring out a new scale, it's obvious to me they don't know what they're doing in this space.

I used the Index S2 for last 2 weeks and it's a big disappointment.

Before I was using Withings Body plus for two years and the measurements really were very close to the results from professional scales.  

I synced the results with Garmin Connect app via Myfitnesspal but unfortunately it never synced the body fat and this was the reason why I decided to buy the new Index2 from Garmin.

Unfortunately, I didn't read this topic before and was unaware that in this field the new Garmin scale is so far away from real results. My BF on Withings was 21% and on Garimin 27% ..... which increased my fitness age from 21 to 45.5 year ...

But yesterday my daughter accidentally cleaning the bathroom smashed the glass on this scale and now I'm back on the starter point

So my question, can you advice a professional smart scale providing similar results to Dexa which sync with Garmin Connect app but together with body fat results?

Will Garmin Connect take into account the results from another scale?

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I gave up and just ordered the Withings. 1 question, the Withings uses lean mass which includes organs. Can you still use it to track muscle gains? It seems like it would fluctuate too much.

My withings body cardio scale tracks muscle and fat gain and loss well, I double check weekly with calipers and the data lines up as accurately as any scale I've used (previously had tanita and fitbit)

If you want to get your withing data into your garmin app there is a github project called withings-sync (make sure you're using the jaroslawhartman repository, there are some older versions which are deprecated) You need to be reasonably tech savvy to set it up but once up and running it does the job well.

I'm having an issue where my readings make no sense. Given my estimated water weight and bone mass, in order for my percentage body fat and skeletal muscle mass readings to be possible I'd have to weigh 20% or 25lbs more than my recorded weight.

Since my estimated water weight and bone weight are smack dab in the middle of the normal range, and I'm nowhere near chubby enough to have 30% body fat, I'm going to guess its a problem with that specifically. I didn't expect 100% accuracy from bioelectrical impedance measurements, but I expected the readings to at least be possible and logical. Instead it seems like the algorithm is complete garbage.

Thanks for the tip! I've had the Withings body+ for a week now and the body fat seems to be much more stable. One issue that I experienced this morning though (after a day of eating a lot of meat) is that my muscle increased by 1.3 lbs. I find it highly unlikely that I gained that much muscle in 1 day. I noticed my water was 2% higher than normal too which is likely throwing the readings off. Have you experienced any similar swings in any of the body composition measurements? 

All bio impedance scales are affected by water, muscle has a very high water content and the scales can't differentiate.

Best practice is to weigh yourself at the same time each day, preferably in the morning before eating but after hydrating.

I find very little fluctuation when I do that

Got it, thanks. I do weigh myself at the same time every day before eating. I don't hydrate though. I tried that with the Garmin and it didn't have any impact. I guess I'll have to try with the Withings, although if it was already high this morning, I wonder how far it would be off if I had hydrated. I guess I'll have to trying weighing before hydration and then again right after.