Running uses energy, but a calorie estimate does not predict how much weight you will lose. Food intake, recovery and your wider health matter. I use training to build a sustainable routine and performance. A body-weight goal needs its own context, and persistent fatigue or restrictive eating deserves professional support.
What can a calorie calculator tell me?
It estimates energy use from a model and your inputs. It does not measure your metabolism or account for every change in appetite and activity. I would not convert one run into a promised change on the scales.
Why does eating enough matter?
The IOC consensus describes health and performance problems associated with prolonged or severe low energy availability in athletes of any sex. More training with too little food is not a reliable shortcut. This guide does not diagnose REDs or prescribe an energy deficit.
What should I do next?
Keep meals and recovery part of the training week. If weight is a medical concern, discuss the goal with a qualified clinician or sports dietitian. Persistent fatigue, repeated injuries, menstrual changes or distress about food need individual support rather than a stricter running target.
