You burn calories in 3 main ways:
* your natural metabolism
* normal daily non-exercise activities
* what you burn through deliberate exercise.
Some sites might mix the last two to come up with an overall activity level. Others (including Spark) track your exercise seperately, and the multiplier only refers to NON-exercise activities. Neither approach is necessarily wrong, but mixing different methodologies is going to give you an incorrect answer.
A multiplier of 1.55 for non-exercise activities is extremely high - it would take a VERY physical job to justify a number that high (especially assuming a 5 day work week). The standard assumption is a multiplier of just 1.2 for a sedentary lifestyle. So maintenance calories is not your metabolism, but would be metabolism plus 20% plus exercise.
Also, a daily calorie deficit of 1000 does not need to be made up of 500 calories from food and 500 from exercise. 500 from exercise is certainly feasible, but it requires a good level of fitness to sustain a burn that high EACH day. Most people probably start at closer to 200 per day from exercise, and gradually build things from there over time.
I hope this puts those numbers in more context.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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