Final answer:
When a person with Type 1 diabetes neglects to take insulin injections, they will exhibit increased production of acetone.
Step-by-step explanation:
Type 1 diabetes mellitus is caused by a decreased ability of the β cells of the pancreas to produce insulin. When a person with Type 1 diabetes neglects to take insulin injections, they will exhibit increased production of acetone. Without insulin, the body cannot properly utilize glucose for energy, so it begins breaking down fat instead, causing increased production of ketone bodies like acetone. Increased acetone production can lead to a condition called diabetic ketoacidosis, which can be life-threatening.