I’m on a 48 hr fast and just got a new smart scale. Says I lost 1.5 lbs, with 1 lb of that being muscle….I know these things may not be 100% accurate but it’s still slightly concerning. Anyone have similar feedback?
All it does is measure electrical resistance. How hydrated you are changes how much “fat” it detects. Prove to yourself how useless it is by drinking a few large glasses of water then weighing yourself a bit later. If it’s accurate all that should change is you have the added weight of two glasses of water for a few hours. If your body fat or “muscle” numbers change you’ll know it’s getting you worried about fake news.
The weight loss from a 48hr fast is going to be roughly 1% muscle, 9% fat, and 90% water.
Even if the scale is totally accurate, changes in muscle mass should only be monitored on a biweekly basis - it isn’t volatile enough to be measurably impacted by a normal fast.