Why do some women get feel before their period?

There's certainly some evidence that women do get hungrier and crave sugar and sweet things, primarily chocolate, leading up to their period in the premenstrual or luteal phase of their cycle. Women possibly become a bit more responsive to insulin in that premenstrual phase. Some women can experience mild alterations in their blood sugar and cravings for chocolate.

Often this hunger is for more carb and sugar heavy foods as we may find the rise in oestrogen increases PMS symptoms, including irritability, stress, and anxiety. Women also often get irritable and cranky premenstrually, and there's a theory that somehow eating chocolate increases serotonin and dopamine, which are involved with helping 'prop up' mood.