Heart Rate Monitor

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Well, I have been gaining weight lately instead of losing despite eating the right amount of calories, so I am thinking maybe myfitnesspals overestimates the amount of calories I burn. Do you think a heart rate monitor would be a good way to find out more accurately how many calories I burn and this, how many I should eat? If so, do you have any reccomendations of heart rate monitors that are the most accurate? Thanks!