Clinton, you're actually more right than you realise. Most cases of PMS are because of estrogen dominance. That's when there is too much estrogen in relation to progesterone. Women get a lot of extra (laboratory produced) estrogen in meat, dairy products, and eggs, not to mention chemicals found in pesticides that connect to estrogen receptors in the body. But they don't get extra progesterone to balance out the extra estrogen. This leads to a hormonal imbalance that leads to PMS.

My PMS is much less severe, and sometimes even unnoticable when I use only organic dairy products and eggs, and I use a progesterone supplement cream (found in health food stores). I'm a vegetarian, so non-organic meat is not an issue for me.

The presence of these hormones in our food products is also responsible for the early onset of puberty that is common these days in girls as young as ten, and for increased rates of breast cancer in women and in men (doubled in the last decade or so).