Why do people with qi deficiency get fat?

Many foods for people with qi deficiency cannot be digested, because our gastrointestinal function needs to be decomposed, but if the food cannot be decomposed, it will become fat accumulation, because it cannot be digested, it will become waste in the body, such as phlegm, drink, blood stasis, which will cause abdominal obesity, edema, and phlegm, slowly showing various diseases.