Amadeus,
I think the reason for not telling people about a fast is that we shouldn't tell it in a spirit of pride, drawing attention to how well intentioned we are or how pious or how strong, for example. To my mind, telling people about it as you have done here doesn't fall into that trap. You are helping other people who are interested in understanding the how or why of a fast, mostly with the intention of improving their experiences of trying to fast. I don't see anything negative in that.
All the best, Rosi
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