In diabetes, ketone bodies indicate fat breakdown and can lead to metabolic acidosis.

• A. They indicate increased insulin production.
• B. They indicate improved glucose uptake by cells.
• C. They indicate fat breakdown and can lead to metabolic acidosis.
• D. They indicate dehydration only.

Answer: (C)

The key idea is that ketone bodies reflect fat breakdown driven by insufficient insulin, and their accumulation can cause metabolic acidosis. When insulin is lacking, the body cannot effectively use glucose, so hormones like glucagon and cortisol trigger lipolysis, releasing fatty acids that the liver converts into ketone bodies (acetoacetate, beta-hydroxybutyrate, and acetone). These ketones are acids, so their buildup lowers blood pH, producing metabolic acidosis—classic in diabetic ketoacidosis. This explains why ketone bodies signal fat breakdown and a risk of acidosis.

Ketones aren’t an indicator of increased insulin production or of improved glucose uptake; in diabetes, insulin deficiency or resistance drives the opposite. They aren’t simply a sign of dehydration, either, though dehydration can accompany the process. The strongest takeaway is that ketone bodies point to fat breakdown due to inadequate insulin and their acid nature can lead to metabolic acidosis.