According to a study I recently read, women tend to burn slightly more calories 7 to 10 days prior to the 1st day they begin to menstruate. Their basal metabolism is slightly higher at that point. However, your basal metabolism on the first day of the period falls. Near the end of the period, the woman's BMR (basal metabolic rate) returns to normal. This of course may vary depending upon a woman's physical activity level. Based on this data, if women consumed an additional 200 calories in the week prior to the initial day of menstruation, they would not gain weight. However, keep in mind that other symptoms of menstruation may include bloating (water weight gain). Conversely, if a woman decided to lose weight, the week prior to the first day of menstruation would enable her to maximize her potential to lose weight by exercising and thus raising the BMR even more. Note: Some articles suggest that a woman burns approximately 200 calories more per day the week prior to the 1st day of menstruation. Remember, each individual is different. Therefore it is only through one's personal experience that one can determine whether this is true.
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