Excess Kyo is seen as a state of disempowerment, being seen as running on empty and requiring filling. Excess Jitsu is a state of having excess energy such as feeling overheated.
These principles relate to traditional thinking as follows
Excess stress: relates to Jitsu. Not enough stress – demotivation relates to Kyo.
Excess of diet: relating to Jitsu would be obesity. Malnutrition would be related to Kyo. With regards to this obesity would start off as being jitsu and then malnutrition