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Muscle does weigh more than fat.
I have been in training for a 10k for about 5 weeks now, going out for a run 3 times a week. Also, watching my diet on non-running days. Beer consumption is restricted to weekends only.
My clothes are looser; my beer belly has nearly gone. My face is less bloated. And when I am running I feel that I am not lugging as much weight around.
but my weight hasn't changed as much as I expected: 13st - 12st9. I was expecting around 12st4.