A little F.Y.I for the Ladies

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Menstrual Cycle and Weight

• Article By: The Weight Watchers Research Department

While there may be minor changes in metabolism, food intake and cravings throughout the menstrual cycle in addition to possible Water retention, these will not impact weight-loss success.

Food cravings, overeating and weight gain are commonly reported during the one to two weeks before menstruation occurs. But what is the science to support these symptoms, and what is their impact on weight-loss success?

Food Intake and Metabolism

While overeating is the popular perception, research has shown that there are only minor changes in actual food intake throughout the menstrual cycle. Most studies suggest an increase in eating of around 100 to 200 calories in the days before bleeding occurs,^1,2 but this appears to be offset by the small rise in metabolism (around 5 to 10 percent)³ that occurs during the same time period. In other words, the body tends to adjust the calories in/calories out on its own. Therefore, in a weight-stable state, no changes in weight will occur.

However, if actively losing weight by following a restricted-calorie food plan, the likely result would be a slight (but hardly noticeable) increase in weight loss due to the increased metabolism without the usual increase in calories. Alternatively, the result instead could be a slightly greater difficulty in following the food plan because of increased hunger during that period.

Food Cravings

Although food cravings are commonly reported during certain times of the menstrual cycle, the scientific evidence on the subjects is limited. Some smaller studies suggest a link, particularly a craving for high carbohydrate sweets.^4,5 These studies also show that cravings tend to occur more often in women with <A href="/health/sciencecenter/Glossary.aspx#premenstural">premenstural syndrome (PMS) and that the cravings increase as symptoms worsen.⁶ While more research is needed to understand food cravings, the good news is that they do not appear to translate into large increases in calorie intake and subsequent weight gain.

Water Retention

The most likely reason for a weight gain is water retention. While this is a common symptom that can be particularly discouraging when following a structured food plan,⁷ the weight gain is usually minor and temporary (that is, any weight that is gained is lost around the time of menstruation). Furthermore, water retention can be lessened during this time period by making small dietary changes, like reducing sodium and increasing fluids.

Bottom Line: Major fluctuations in eating and weight during certain periods of the menstrual cycle are a common perception, but studies done in the area find that the changes are minor, temporary and will not impact weight-loss success.

This content is reviewed regularly. Last updated September 24, 2009.