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Smart scale reading

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?

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Answer

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.

Answer

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.

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