It's a fluid issue, definitely. The Tanita scales measure water. Your body fat reading will go back to normal in a few days. Be warned that it might drop way low (and you weight might go way up) first, but it''ll even out as your fluid levels get back to normal.
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Whenever you've been sick, throw the scales away for a week or two. Your body isn't back to normal when you feel like it, it'll take a few more days. So ignore weird readouts in that time. Skip your weigh-in this week, and look at next week's instead.
When you are exercising regularly and challenging yourself with intense workouts, your muscles retain water (it takes 3 water molecules to bond to each glycogen molcule, and this helps deliver energy to the muscles more efficiently). When you stop working out for a while, your muscles let go of this water, which is why your weight has gone down.
Tanita scales work on bio-electrical impedance - basically the amount of resistance to a very small electric current passing through your body, and then calculate body fat based on the assumption that muscle is wet, and fat is dry (and water conducts electricity). I'm not sure that you are necessarily 'dehydrated' in a clinical sense, but yes it is likely that you are carrying less water, and this is why the scales are reporting higher body fat.
Likely things will return to normal when you start working out again.
This whole week I was sick and was not able to make it to the gym. I am finally starting to feel better again. I did eat regularly as much as a I could during the week. Noticed my weight has been dropping a pound or two each day for past few days and my body fat percentage went up? It went up by 2% during past couple of days. I am using one of those Tanita scales to measure body fat. Should I be concerned?
I also want to assume maybe my body is dehydrated from my cold and that's why the body fat percentage is up. But I've seen this pattern happen in the past for me.. weight goes down and body fat goes up according to scale.
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