How could diet affect PMS?

Specific diets have not been studied for PMS. Some observational evidence has found that consuming foods high in calcium, vitamin D, thiamine, and riboflavin has been associated with a lower risk of PMS.^[1][2] Common dietary recommendations for PMS include small and frequent meals as well as reducing consumption of salt, caffeine, and refined sugars. These modifications are intended to reduce irritability, insomnia, fluid retention, bloating, and weight gain during PMS.^[3]