According to yoga principles, what is a common cause of illness?

The correct answer emphasizes how poor mental attitudes contribute to illness, aligning with the holistic approach found in yoga principles. This perspective holds that mental well-being significantly impacts physical health. When individuals harbor negative thoughts, stress, or a lack of positivity, it can lead to a decline in their overall health, manifesting in various physical ailments. Yoga recognizes the interconnectedness of the mind and body, advocating that cultivating a healthy mental state through practices like meditation and mindfulness can help prevent illness.

The other options represent factors that can also influence health but do not encapsulate the core yoga principle regarding illness as effectively. While excessive physical activity, high-stress environments, and poor sleep quality can certainly impact health negatively, they tend to be viewed more as environmental or lifestyle choices rather than the foundational mental attitudes that yoga teaches should be prioritized to maintain overall wellness.