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An overview of different eye care providers and what they do, from ophthalmlogists and optometrists to opticians and ocularists.

To determine the number of calories and fat grams you need each day to lose, maintain, or gain weight, ask your healthcare provider or a registered dietitian. As a general guideline, to maintain your current weight, follow the three-step formula below. Remember, everyone's body and metabolism are different, so these numbers could vary slightly for you and can change over time.

1. Determine your estimated calorie needs in the chart below:

Physical Activity Level
Gender	Age (years)	Inactive (Sedentary)	Moderately Active	Active
Female	19–30	1,800–2,000	2,000–2,200	2,400
	31–50	1,800	2,000	2,200
	51+	1,600	1,800	2...

With advances in technology, pacemakers and ICDs generally last several years and, in most cases, allow a person to lead a normal life.

Detailed information on the health benefits of exercise, including how to calculate your target heart rate zone and basic exercise guidelines.

Diabetes affects the cardiovascular system, but many problems aren't apparent until a person has a heart attack or stroke.

Osteoporosis is a disease that causes weak, thinning bones. This leaves the bones at greater risk of breaking. The bones most often affected are the hips, spine, and wrists. Learn more about osteoporosis, including who is at risk, what the symptoms are, and how it's diagnosed and treated.

Read on for helpful steps to take to prevent sports injuries.

Because children's bodies are still growing and their coordination is still developing, children are more at risk for sports injuries than adults.

Everyone has experienced low back pain at one time or another. Most people can recover from low back pain with home treatment, such as changes in activity, weight loss, quitting smoking, and other steps. Sometimes medicine or surgery is needed.