Supplement support: our expert answers your questions about sports supplements and exercise. (answers).(Brief Article)

"Is it true that if you replace a high-carb diet with a protein diet your risk of heart disease can actually go down?"

Yes. There is evidence that if you replace simple carbs that are high-glycemic (elicit a strong blood glucose and insulin response) with a protein food (preferably low in saturated fat), this may actually have a beneficial effect on your blood lipids, resulting in lowered cholesterol and triglycerides. This isn't to say all carbs are bad. It's picking the right carbs that matters. For instance, it's better to choose brown rice over white, or whole wheat bread over white. As far its choosing protein, opt for lean sources such as skinless chicken breast, tuna and skim milk.

"I'm 62, and the only exercise I get is walking and gardening. What supplements would your recommend?"

It's difficult to say which supplements to recommend without knowing your eating habits and how much exercise you're doing. You should be walking 20 to 40 minutes at least three times per week. In addition, you'll want to take a multivitamin and mineral supplement. Outside of that, try to eat frequent small meals that emphasize lean protein sources like skinless chicken breasts or fish, fibrous vegetables such as broccoli, and starchy carbohydrates such as brown rice or a baked potato.

"I'm 30 years old and trying ...