Use estimates as a starting point
Energy equations cannot fully account for daily movement, appetite, training volume, medication, or changes in body composition. Use a consistent intake and a 2–3 week scale-weight trend to check the estimate, then adjust one small step at a time.
A sensible nutrition workflow
For fat loss, begin with a moderate deficit that you can sustain while training and eating enough protein. For muscle gain, a small surplus is usually easier to monitor than a large one. The macro and meal tools translate either target into a practical daily plan—not a medical prescription.
When to get individual advice
If you are pregnant, under 18, have a medical condition, a history of disordered eating, or use medicines that affect appetite or weight, seek guidance from a qualified clinician or registered dietitian before deliberately changing calories.