It's a matter of chemistry. When you digest carbohydrates, the process turns your innards slightly acidic. That's a problem because a high-acid environment leaches calcium from bone, says Tufts University researcher Bess Dawson-Hughes, MD. In contrast, fruits and vegetables create a skeleton-friendly alkaline environment. The American diet tends to be acid-producing -- particularly hard on older people, whose kidneys can't clear acid compounds as quickly.
In Dr. Dawson-Hughes's new study, an alkaline supplement lowered the amount of calcium that volunteers excreted by 20 percent. That supplement isn't currently available outside research labs, but, says Dr. Dawson-Hughes, you can get the same benefit by tweaking your diet. Her skeleton-strengthening guidelines: Include at least two vegetable or fruit servings at every meal, and eat no more than two daily servings of carbs like bread, cereal, and pasta. To keep your bones even stronger, try the substitutions below.
Instead of this acid producer
- pasta
- soda
- meat and poultry
- beer
- peanuts
Eat this alkali booster
- potatoes
- fruit juice
- tofu
- wine
- raisins


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