“Eat 2 ounces of cheese each day and walk a mile a day.”
“There are no known ways to prevent osteoporosis.”
“Do weight-bearing exercises regularly and take hormones as ordered by your physician.”
“Take potassium supplements daily.”
Number 3 is correct.
Hormone replacement therapy and weight-bearing exercises (such as walking) are recommended to prevent osteoporosis. A therapeutic dose of calcium to influence bone density for women 51 and older is 1,200 mg/day. Two ounces of hard cheese contains 500 mg of calcium, which is suboptimal. Potassium supplements are not effective in preventing osteoporosis.