Your lighter period is a coincidence. By the time alcohol hits your bloodstream it's not alcohol anymore, but a bunch of toxic metabolites that whiz around and give you the drunk feeling. It can't thin out your blood. Drinking *heavily* is a bad idea if you want to get pregnant (or at all, but that's another story). But an occasional cocktail is fine.
Nutrition. Pistachios contain fewer calories and more potassium and vitamin K per serving than other nuts. A 1-ounce serving of dry-roasted pistachios contains 160 calories, 6 grams of protein, 3 grams of fiber and 15 grams of fat, including only 2 grams of saturated fat.
A one-ounce serving of pistachios contains 49 nuts and about 160 calories. That's more nuts and fewer calories per serving than any other nut. A serving of pistachios contains more than 10% of the Daily Value (DV) for dietary fiber, 20% of the DV for vitamin B6, and 15% of the DV for thiamine.