I am 5'8", weigh 229. bp is 120/75. i walk 2 1/2 miles in 40 min. 5 x a week. my weight loss is slow. what is a healthy weight for me? 160 seems low.

This is about right: Your height and weight convert to a body mass index (bmi) of 34, which is in the obese category. 160 pounds would be a bmi of 24, which is in the ideal bmi range of 20-25. Exercise will help with weight loss, but you will lose faster if you also follow a low-glycemic index diet (increased protein, reduced sweets and starches).