In a recent study, 245 overweight women were assigned to one of three
diets; lower fat/higher carb; higher fat/lower carb; or higher fat/lower
carb with the addition of one and a half ounces of walnuts a day. They
also limited saturated fats, chose healthy carbs and exercised for one
hour per day. All three groups lost about 15 lbs. in six months.
However, the walnut group had the most beneficial changes in blood
cholesterol which included a reduction in LDL (bad) cholesterol and a
slight increase in HDL (good) cholesterol. Walnuts are rich in
alpha-linolenic acid, a heart-healthy omega 3 fatty acid.