How do you know if your metabolism is fast or slow?

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coldhonkey
coldhonkey Posts: 13
edited January 30 in Fitness and Exercise
I'm still not sure how many calories I should eat. I eat til I'm satisfied but the number at the end of the day is always lower than the numbers I crunched (BMR+exercise). Just listen to my body? Could it be that my metabolism is slow? How do I find that out for certain?

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