清淡 (qing dan) usage: any food, or from a diet? I ate with a Chinese who mentioned the soup was 清淡 (qing dan): clear, and bland. On Google all I found were acupuncture and "macrobiotic diet" websites.

Is 清淡 (qing dan) an adjective commonly applied to food that is simple and light, or is it reserved for food from a special diet?
It's written as 清淡 and used in different contexts.


For light colors, smells
For light (non-greasy, non-oily) food
Business running slow or slacking
In arts for a simple style