Resting Energy (REE), Mifflin–St Jeor: Male: \\(\\text{REE} = 10\\,w + 6.25\\,h - 5\\,a + 5\\) Female: \\(\\text{REE} = 10\\,w + 6.25\\,h - 5\\,a - 161\\) where \\(w\\) is weight (kg), \\(h\\) height (cm), \\(a\\) age (y). TDEE: \\(\\text{TDEE} = \\text{REE} \\times AF\\) (activity factor 1.2–1.9). Daily deficit: \\(\\Delta = \\text{TDEE} - \\text{intake}\\). Weekly loss (kg): \\(\\Delta_\\text{week}/7700\\). Time to goal (weeks): \\(\\dfrac{w - w_{\\text{target}}}{\\Delta_\\text{week}/7700}\\) if \\(\\Delta>0\\).