PMS-C is associated with increased appetite, craving for sweets, headache, fatigue, fainting spells, and heart palpitations. Glucose tolerance tests (GTT) performed on PMS-C patients during the luteal phase of their cycle show a flattening of the early part of the curve, whereas during the follicular phase (first half of cycle) their GTT is normal. Some studies have also shown a fourth-hour hypoglycemic response during the luteal phase.
There is currently no clear explanation for this phenomenon, although an increased cellular capacity to bind insulin has been postulated. This appears to be hormonally regulated, but other factors may also be involved. For example, the cellular response to a high glucose load results in an increased affinity for insulin. Sodium chloride enhances insulin response to glucose ingestion, and decreased pancreatic magnesium levels result in increased secretion of insulin in response to glucose. All are possible mechanisms.
In initial research, the supplementation of magnesium has resulted in the satisfying of chocolate cravings. Since both chocolate and cocoa powder contain high levels of magnesium (520mg/100gm and 100mg/100gm, respectively), your craving of chocolate may just reflect your desire to supplement this essential element. Additionally, there are links between low magnesium levels and the development of PMS symptoms, which may explain some women's monthly chocolate binge.
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