Question

why is the digestion of food considered a slow digestion?

Answer 1

It is considered as slow digestion because our body and enzymes partially digest food and then after some time another enzyme digest the same food to complete the digestion. Whole digestion in a human body completes average in about 6 hours and
this is slow. That is why it is considered as slow digestion.

Answer 2

Feeling sluggish and bloated can be the result of food choices -- from too much alcohol, salt, sugar and high fat foods, to natural fermentable sugars in fruits, vegetables, dairy, legumes, grains and cereals," Grosse said.