QUESTION: I learned that insulin lowers glucose in blood plasma by helping the body use excess glucose through an increased rate of respiration. What is the actual mechanism, and does insulin make breathing faster?
Insulin does not normally lower blood glucose by increasing the breathing rate. It binds to insulin receptors and signals muscle and fat cells to move GLUT4 glucose transporters to their surfaces. It also tells the liver to stop releasing as much glucose and to store glucose as glycogen. Some glucose is used in cellular respiration to produce ATP, while excess energy is stored. Rapid, deep breathing is instead a warning sign of metabolic acidosis, particularly diabetic ketoacidosis (DKA).
Answer by Dr. Albana Greca, MD, MMedSc
Hi,
The confusion comes from using the word “respiration” for two different processes: cellular respiration and breathing. They are related, but they are not the same.
Cellular respiration is the series of chemical reactions that converts nutrients such as glucose into ATP, the usable energy of cells. It includes glycolysis, the citric-acid cycle, and oxidative phosphorylation.
Breathing, or ventilation, moves air into and out of the lungs to take in oxygen and remove carbon dioxide. Insulin can change how nutrients are used inside cells, but an ordinary insulin response does not require a faster visible breathing rate.
After glucose rises, pancreatic beta cells release insulin. Insulin binds to a receptor on target cells and activates an intracellular signaling pathway. Its main glucose-lowering actions are:
These combined effects lower blood glucose. Our insulin treatment guide explains how injected insulin replaces or supplements this normal hormone action.
No. Some glucose is oxidized to make ATP, but the body also stores energy. Glucose can be stored as glycogen in liver and muscle. When immediate and glycogen-storage needs are met, some excess energy can ultimately be converted into fatty acids and triglycerides.
Insulin therefore acts as both a glucose-regulating and energy-storage hormone. It does not simply force every glucose molecule through cellular respiration.
No. Insulin strongly increases glucose uptake through GLUT4 in skeletal muscle and fat tissue. The brain, red blood cells, liver, and several other tissues use different glucose transporters and do not depend on insulin for glucose entry in the same way.
Even so, insulin is essential for overall metabolic coordination. In type 1 diabetes, severe insulin deficiency allows uncontrolled liver glucose production, fat breakdown, and ketone formation. Read our type 1 diabetes guide.
When insulin is severely deficient, the liver converts fatty acids into ketone bodies. Accumulation of ketoacids lowers blood bicarbonate and causes metabolic acidosis.
The brain responds by increasing the depth and sometimes the rate of breathing. This pattern is called Kussmaul breathing. The lungs remove more carbon dioxide, which shifts the carbonic-acid buffering reaction and partially compensates for the low pH.
The body does not breathe out glucose or directly exhale hydrogen ions. It exhales carbon dioxide. Breathing compensation can reduce the severity of acidosis temporarily, but it cannot stop ketone production or cure DKA.
In hospital treatment, insulin suppresses ketone production, reduces liver glucose output, and allows glucose utilization. Intravenous fluids restore circulation and hydration, while potassium and other electrolytes are monitored and replaced as needed.
As ketones clear and bicarbonate and pH recover, Kussmaul breathing resolves. The breathing improves because the acidosis is being corrected—not because insulin directly slows the lungs.
Rapid breathing is not an expected routine effect of insulin. After an injection, fast breathing could reflect severe hypoglycemia, allergy, infection, heart or lung disease, anxiety, DKA from insufficient insulin, or another emergency and should be assessed according to the accompanying symptoms.
Low glucose more commonly causes sweating, shaking, hunger, palpitations, dizziness, behavioral change, confusion, seizure, or unconsciousness. Review insulin side effects and how to recognize high and low glucose.
Rapid, deep, labored breathing with high glucose, ketones, vomiting, abdominal pain, fruity-smelling breath, severe thirst, dehydration, drowsiness, or confusion may indicate DKA. Seek emergency care immediately. Do not exercise or take extra insulin without following an established emergency correction plan. See dangerous blood sugar levels.
The scientifically correct sequence is: insulin-receptor signaling increases glucose uptake and storage and suppresses liver glucose production, while cellular metabolism uses some glucose for ATP. By contrast, Kussmaul breathing is respiratory compensation for ketoacidosis caused by insufficient effective insulin. The lungs exhale carbon dioxide, not glucose or free hydrogen ions.
Educational safety note: This answer is for general diabetes education only. It does not replace personal medical advice or emergency assessment. Do not change insulin doses or attempt to treat rapid breathing, ketones, severe hyperglycemia, or hypoglycemia without following professional instructions.
Last reviewed: July 2026.
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