As a snack twice a week, peanuts are excellent. Go with unsalted or lightly salted. Peanut butter is actually excellent food source and contains monounsaturated fat. Peanut butter contains around 30 percent protein, and is also a worthwhile source of iron, niacin (vitamin B3) and fiber.
All peanut butter isn’t equal, some have additives in various amounts, read the label carefully. I happen to love peanut butter so this one isn’t a hard sell to me, but overall peanut butter seems satisfying holding hunger at bay, and from what I’ve noticed it does have a lower blood pressure effect.
I haven’t found any hard scientific studies but Niacin is known to lower BP. Which reminds me of a quote I read the other day on twitter. “Studies show that studies aren’t reliable.”
http://www.peanut-institute.org/111705_PR.html
http://www.vitaminsdiary.com/nutrients/peanut-butter.htm
http://www.peanutbutterlovers.com/nutrition/blood_pressure.html
http://www.healthlinkbc.ca/healthfiles/hfile68b.stm