We used the visual analog scale (VAS)*1 to investigate how the feeling of fatigue changes with time. In the group that did not eat breakfast, the feeling of fatigue increased with time.
The feeling of tiredness in the group that ate rice balls was low only around 8:30 AM, 30 minutes after eating at 8:00.
In the group that ate a western-style breakfast, the feeling of fatigue increased gradually from 8:30 AM. The feeling of fatigue in the group that ate the western-style breakfast was lower than that in the group that ate rice balls at almost all time points.
The same kind of tendency (i.e., a low feeling of fatigue) was seen in the group that ate nutritionally balanced food bars as in the group that ate a western-style breakfast.
*1 Visual analog scale (VAS)VAS is a method of quantifying subjective feeling by having subjects put a vertical line across a 10-cm horizontal line with contrasting items at each end according to each subject's degree of feeling and then measuring the length from the left edge of the horizontal line. That is why the vertical axis is shown in cm.