I’m a huge fan of fasting for weight loss. I dropped 45lbs in 3 months, and I’m still down ~40lbs 7 months later. That’s a big win in my book.
That said, I’d still 100% agree with your statement by adding the caveat “with a BMI much below 30”. The issue is that the % of lean mass lost during extended fasting is very minimal when your obese (I presume we’re not talking about IF).
However when BMI drops much below 30, the % of lean mass lost as a percentage of weight lost increases exponentially. The OP has a BMI of around 21, which is not a good fit for extended fasting as a weight loss strategy. Still totally valid for things like autophagy and other stuff though. Dr. Fung says much the same.
I’d agree with this: Extended fasting for weight loss is counterproductive with a BMI much below 30.