The way our culture defines health:

• Thinness
• Exercising as much as possible – the more the better
• Thinness
• Only eating certain "healthy" foods, although which foods are acceptable keeps changing (e.g. dairy is good for your bones today and dangerous to your health tomorrow).
• Thinness
• Counting/limiting calories, carbohydrates and fat
• Did I mention thinness?

How I define health:

• Your organs are functioning properly.  When you think about it, all medical screenings and tests are just proxies to determine if your body is functioning properly at the organ level.
• Psychological stability, mental capabilities at your brain's capacity
• Emotional wellness – ability to experience, identify, and cope with emotions effectively

Note that weight isn't part of my definition of health.  Normal weights occur at all weight points – this is how nature works.  A person can be healthy at any weight, just like they can be unhealthy at any weight.  Health is a picture of the whole person – mind, body and spirit, and we must nurture all aspects.