The human digestive capacity can be broadly classified into three types: Weak, Strong and Moderate.
Weak: People with weak digestion burn sugar slowly. The body must burn sugar in order to provide energy for digesting meat and fat. If this sugar-burning capacity is slow they will have trouble digesting large quantities of concentrated proteins like meat, eggs,fish, beans and legumes.

Strong: People with a strong digestive capacity can also have problems. They burn sugar rapidly so excess consumption of sugars and starches makes them agitated as their nervous system is over stimulated.

Moderate: A moderate digestive capacity signifies a balanced state of metabolism. Such people can handle both varieties of food when properly combined.