Final answer:
Metabolic diseases are caused by disruptions in the conversion of food to energy on a cellular level. Examples include type 2 diabetes, Cushing syndrome, and mitochondrial diseases.
Step-by-step explanation:
Metabolic diseases are caused by a disruption of the normal processes of converting food to energy on a cellular level. These diseases are most commonly the result of malfunctioning proteins or enzymes critical to metabolic pathways. They can be the consequence of genetic alterations or mutations in these proteins or enzymes. Some examples of metabolic diseases include type 2 diabetes, Cushing syndrome, and mitochondrial diseases.