TomTom Touch - Body composition inaccurate — TomTom Community

TomTom Touch - Body composition inaccurate

Sandro LumeSandro Lume Posts: 3 [Apprentice Traveler]
edited January 2019 in TomTom Touch
I have done the measurements according to recommendations: same time in the morning and before eating liquids or food. For 6x a week I do physical activities (weight lifting for 6x a week and 3x aerobic exercise) I have a regulated diet, calories set right now for weight loss (I lost 1.5kg) in two weeks following this carbohydrate restriction diet as I do every year aiming at fat loss. In my balance of bioimpedance Tanita my body composition indicates 15% of body fat currently being that before the diet was 17%, therefore it indicates a loss of 2% while TomTom Touch indicated to me before the diet 26% and currently 25.5 % Of body fat (I was weighing 95kg and now weighing 93.1kg) the balance data seem more accurate to me and maybe they are never identical but the difference is huge between them!
Another detail is that it seems that the software only understands that there is a change in body composition if you indicate before a change of weight, if you lose weight it indicates a slight loss of fat, if you gain weight it identifies a fat increase, case You do not change your weight it simply keeps the body composition, ignoring the possibility of you maintaining the weight while gaining muscle mass and losing fat. I do not know if the problem is in the hardware or software that interprets the information but this needs to be adjusted, I'm disappointed with the results presented, not with the numbers (15% or 25,5%) but with the lack of precision of how much I'm really losing fat.


  • tfarabaughtfarabaugh Posts: 16,727
    Every body fat composition device takes a measure differently, some measure the whole body (if you stand on sensor pads and hold them in your hand as well), and others (like the Touch) are predominantly looking at the upper body as they are using the hands (arms) only. Since the torso has a much higher fat content than the rest of the body (this is where most people keep fat stores, plus the organs are all protected by visceral fat), a torso dominated measurement will generally be a higher number. The important thing to look at is not the actual number itself, but at the trend. Is the number going up and down over time (looking at weeks and months, not days)? That is the key, to look at the trend, not at a specific number. The measurement is also heavily influenced by the time of day you take it, your hydration level, where you are on your menses cycle (for women) and other factors that it will vary day by day. By looking at it over the long term and seeing how it is trending you will get value out of it.

    I am a competitive athlete with body fat in the single digits (8%-9% generally) and the Touch shows me around 15%. But it is consistently off by that percent, so knowing that it is always going to be offset, I do not worry about the specific number but more if the number is improving or getting worse.

    I hope this helped answer your question. If so, please mark it as a solution so others can look for it if they have the same question.
  • Sandro LumeSandro Lume Posts: 3 [Apprentice Traveler]
    I understand, but mathematically I had a loss of 1.9kg of my weight (weighed 95kg and now 93.1kg) the TomTom Touch indicates a loss of 0.5% which would be 475g of loss, which I assume is fat He maintained the same percentage of muscle mass by 43%. So this way 1.9kg - 0.475kg = 1.425kg that I lost and it would be important for me to know where they came from. These little information will tell me if I have to make adjustments in my diet and it is important to say that my hydration is equal and within the recommended. I agree that the important thing is to see if the numbers are rising or falling independently if I have 25% or 15% fat, but mathematically the numbers do not close.
  • tfarabaughtfarabaugh Posts: 16,727
    Unfortunately the device is simply not that precise (no device is). It is making an estimate based on the electrical feedback it gets based on standard algorithms regarding electrical current time and fat, muscle, bone, etc., it cannot make small distinctions in composition, it is looking at overall trends.
  • Sandro LumeSandro Lume Posts: 3 [Apprentice Traveler]
    Unfortunately this sensor is totally inaccurate and ends with mathematical logic! At the beginning of the week I weighed 93.1kg today I weigh myself and I weigh 93.6kg a gain of 0.5kg when using the sensor it shows that I gained 1.5kg of fat! From 25.5% to 27%! You can give the justification you want but this needs adjustments! Or do not put something on the market without being absolutely sure of its functioning, do not pinpoint the exact amount of fat okay, now aim something mathematically impossible shows confirms that something is wrong! (My muscle mass remains the same)
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