I'm already having a numeric "Body" score that tells you if you're living a healthy lifestyle, but what about how you're feeling that day?
I think I should make the Body score also be colored depending on how your body's internal defenses are at the moment.
Blue: You can do just about anything, including standing out in torrential rains, and not get so much as a cold.
Green: Normal everyday healthy. Neither particularly resistant or vulnerable to illness.
Yellow: Feeling slightly under the weather. Recommend taking precautions to keep from getting sick.
Red: You're in danger of contracting a serious illness if you aren't careful today.
The idea came to me when I imagined the character running through a thunderstorm, ducking from doorway to doorway to keep out of the rain. Even simple illnesses can affect your maximum stamina or other stats.