This only really works if you sit in a chair all day. Why not just exercise instead? You can still fast, but eat once a day in the evening if your heart is set

This only really works if you sit in a chair all day. Why not just exercise instead? You can still fast, but eat once a day in the evening if your heart is set on it. Nobody with a physical job could pull off days of fasting like this, it's totally unsustainable. This is basically just anorexia.