Have you ever felt "perfectly healthy" but found yourself out of breath climbing stairs? Or tossed and turned all night after a minor setback? Evaluating your own health is the first step toward maintaining it. In this lesson, we will shift fromsubjective feelingstoobjective evaluation, using quantitative data to map out a true personal health baseline.

Core Evaluation Indicators

• Key Term: Body Mass Index (BMI): A commonly used standard for measuring body fat and overall health. Formula: $\text{BMI} = \text{weight (kg)} / (\text{height (m)})^2$. By calculating it, you can objectively assess your growth and development level.
• Understanding Physiological Mechanisms: Self-assessment includes not only static indicators but also an understanding of life's biological principles. For example, knowing how external stimuli (alcohol or tobacco) interfere with core bodily functions (such as a water flea's heart rate) reflects your grasp of the fundamental logic behind health.
• Mental Health & Social Adaptation: The definition of health goes beyond the physical level. An individual's spontaneous response to conflict and setbacks is a key "soft indicator" of mental well-being.