1800 is my net, I’m definitely eating and carefully tracking expenditure as well as refueling properly. Since my BMR is around 2100 that’s only a 300 cal deficit (daily consumption is around 2700 but net is 1800). Definitely not risky, in my non-medical-professional opinion. My doctor knows this as well.
Daily mood tracking and keeping strong working logs keeps me in this safe weight loss range while still improving performance.
I’m not a giant by any means and over many years have found this just works best for me
