Type 1 diabetes is an autoimmune condition in which the body does not make enough insulin. Because insulin is needed to move glucose from the blood into cells, people with type 1 diabetes need lifelong insulin treatment.
Unlike type 2 diabetes, type 1 diabetes is not usually prevented through diet, weight loss, or exercise. But many complications related to type 1 diabetes can be reduced with early recognition, insulin access, blood sugar monitoring, ketone testing, sick-day planning, and regular follow-up.
One of the most urgent complications is diabetic ketoacidosis, or DKA. DKA can become life-threatening quickly, so prevention depends on knowing when to check ketones, when to take action, and when to seek emergency care.
What Is Type 1 Diabetes?
Type 1 diabetes happens when the immune system attacks insulin-producing cells in the pancreas. Without enough insulin, blood glucose rises and the body may start breaking down fat for energy, which can produce ketones.
NIDDK explains that people with type 1 diabetes need to manage the condition to prevent health problems and have a higher risk of diabetic ketoacidosis. NIDDK also notes that DKA is most common in people with type 1 diabetes.
Type 1 diabetes can appear in children, teenagers, or adults. Symptoms may develop quickly and can include excessive thirst, frequent urination, weight loss, fatigue, blurry vision, hunger, bedwetting in a child who was previously dry, nausea, vomiting, or abdominal pain.
Can You Prevent Type 1 Diabetes?
For most people, there is no simple lifestyle checklist that prevents type 1 diabetes. Eating healthier, exercising, sleeping well, and managing weight are important for overall health, but they do not reliably prevent the autoimmune process that causes type 1 diabetes.
However, early detection may reduce the risk of being diagnosed during DKA. The ADA 2026 Standards of Care state that people with type 1 diabetes often present with acute symptoms and markedly elevated glucose, and that 25% to 50% are diagnosed with life-threatening DKA. The same Standards also recommend screening for presymptomatic type 1 diabetes using islet autoantibodies in appropriate settings.
If you have a close relative with type 1 diabetes or a personal or family history of autoimmune disease, ask a healthcare provider whether type 1 diabetes risk screening or referral to an endocrinology program is appropriate.
What Is DKA?
DKA develops when the body does not have enough insulin. Glucose builds up in the blood, and the body breaks down fat for energy, producing ketones. Too many ketones can make the blood acidic.
The CDC explains that DKA develops when the body does not have enough insulin to let blood sugar into cells for energy. It also notes that ketone test kits are available over the counter and can be used to check ketones at home.
DKA can happen with high blood sugar, missed insulin, pump failure, illness, dehydration, infection, injury, surgery, vomiting, pregnancy, or sometimes with certain medications. It can also happen quickly in people who are newly developing type 1 diabetes.
Checklist Step 1: Never Stop Basal Insulin Without Medical Guidance
People with type 1 diabetes need background insulin even when they are not eating. This may come from long-acting insulin, an insulin pump, or another plan prescribed by the diabetes care team.
Skipping insulin can quickly increase the risk of high blood sugar and ketones. This is especially dangerous during illness, vomiting, pump problems, or reduced food intake.
The ADA 2026 Standards of Care for hospital diabetes care emphasize that basal insulin should not be held for people with type 1 diabetes, especially during care transitions.
Checklist Step 2: Have a Written Sick-Day Plan
Illness can raise blood sugar even when you are eating less. Fever, infection, vomiting, dehydration, stress hormones, and some medicines can make glucose and ketones harder to manage.
A sick-day plan should explain how often to check glucose, when to check ketones, how to adjust insulin, what fluids or carbohydrates to use, which medicines to avoid, and when to call the diabetes care team.
The American Diabetes Association recommends testing ketones every 4 to 6 hours when you are feeling sick and writing down a sick-day plan after discussing it with your diabetes care team.
Checklist Step 3: Know When to Check Ketones
Ketone testing is one of the most important DKA prevention tools. Ketones can be checked with urine ketone strips or a blood ketone meter, depending on your care plan.
The CDC advises that if you are sick and your blood sugar is 240 mg/dL or above, you should use an over-the-counter ketone test kit to check for ketones. The American Diabetes Association also advises checking ketones when blood glucose is high or when you are sick or not feeling well.
Your diabetes care team may recommend checking at a different threshold, such as 200 mg/dL, or checking based on symptoms even if glucose is not extremely high. Follow your individualized plan.
Checklist Step 4: Keep Ketone Supplies Current
Ketone testing does not help if supplies are expired, missing, or difficult to find during illness. Keep urine ketone strips or a blood ketone meter available at home, school, work, and travel when recommended.
The American Diabetes Association advises people at risk for DKA to keep a blood ketone meter or urine ketone strips on hand and check that supplies are not expired.
Store supplies according to instructions. Make sure caregivers, partners, school staff, coaches, or trusted family members know where the supplies are and when they should be used.
Checklist Step 5: Watch for DKA Symptoms
DKA symptoms can include high blood sugar, high ketones, nausea, vomiting, stomach pain, fruity-smelling breath, rapid breathing, extreme thirst, frequent urination, dehydration, confusion, severe fatigue, or feeling very ill.
Symptoms can worsen quickly. Do not wait for every symptom to appear. Vomiting, abdominal pain, confusion, rapid breathing, or high ketones should be taken seriously.
The ADA 2026 hospital Standards note that DKA can sometimes occur with glucose below 200 mg/dL, called euglycemic DKA, and that diagnosis depends on ketosis and metabolic acidosis as well as clinical assessment.
Checklist Step 6: Protect Insulin Access
Running out of insulin is a preventable DKA risk. Keep track of refills, insurance approvals, pump supplies, pen needles, syringes, infusion sets, reservoirs, batteries, chargers, glucose strips, CGM sensors, and backup insulin plans.
The ADA Standards of Care note that people who have experienced DKA or hyperglycemic crisis should be screened for social determinants of health that may contribute to these complications, including inadequate access to insulin, glucose-lowering medications, and diabetes durable medical equipment.
If insulin is hard to afford or supplies are unreliable, tell your care team right away. Clinics, pharmacists, manufacturers, community programs, and insurance teams may be able to help before an emergency happens.
Checklist Step 7: Have a Pump-Failure or Device-Failure Plan
Insulin pump users need a backup plan because pump interruption can reduce insulin delivery quickly. Infusion set failure, kinked tubing, empty reservoirs, site problems, occlusions, dead batteries, or device malfunction can lead to high glucose and ketones.
Your plan should include backup long-acting insulin if prescribed, rapid-acting insulin by pen or syringe, correction instructions, ketone testing instructions, and when to change the infusion site.
If glucose remains high after a correction or ketones are rising, follow your sick-day or pump-failure plan and contact your diabetes care team.
Checklist Step 8: Monitor Glucose Patterns
Blood glucose monitoring helps detect high and low blood sugar before complications occur. This may involve fingerstick checks, a continuous glucose monitor, or both.
NIDDK notes that checking blood glucose at home can help people manage diabetes and understand how foods, physical activity, stress, and medicines affect blood glucose.
Glucose trends matter. Repeated overnight highs, morning highs, highs after meals, exercise-related lows, or frequent corrections should be reviewed with your diabetes care team.
Checklist Step 9: Treat Low Blood Sugar Safely
DKA prevention is important, but avoiding severe low blood sugar also matters. Too much insulin, missed meals, exercise, alcohol, vomiting, or dosing errors can lead to hypoglycemia.
Keep fast-acting carbohydrates available, such as glucose tablets, glucose gel, juice, or other options recommended by your care team. People at risk for severe lows should ask about glucagon and make sure others know how to use it.
Do not reduce insulin repeatedly out of fear of lows without medical guidance. Instead, ask your care team to review insulin settings, meal timing, exercise planning, and hypoglycemia patterns.
Checklist Step 10: Plan for Exercise
Physical activity can support heart health, insulin sensitivity, mood, strength, and overall well-being. But exercise can also change blood sugar before, during, and after activity.
Some activities lower glucose, while intense activity or stress hormones may raise it. Insulin on board, food timing, hydration, illness, and ketones all matter.
Avoid exercising when ketones are moderate or high unless your diabetes team has given specific instructions. If glucose is high and ketones are present, exercise can make ketones worse for some people.
Checklist Step 11: Use Food and Hydration as Part of the Plan
Food choices and hydration help support glucose stability, but they do not replace insulin. People with type 1 diabetes need insulin even when eating very little or following a low-carbohydrate pattern.
Counting carbohydrates, matching insulin to meals, and planning for snacks can reduce swings. During illness, fluids and carbohydrate-containing liquids may be needed if eating is difficult, while insulin may still be necessary to prevent ketones.
During vomiting, diarrhea, fever, or poor intake, follow your sick-day plan and ask for medical guidance early. Dehydration can worsen DKA risk.
Checklist Step 12: Keep Regular Follow-Up
Type 1 diabetes care changes over time. Insulin needs may shift with growth, puberty, menstrual cycles, pregnancy, illness, stress, weight changes, exercise, sleep, medications, or changes in routine.
Follow-up visits may include A1C, time-in-range review, glucose patterns, blood pressure, cholesterol, kidney tests, eye exams, foot checks, injection or pump site checks, hypoglycemia review, ketone plan review, and mental health screening.
NIDDK explains that managing diabetes includes managing blood glucose, blood pressure, and cholesterol levels, and that managing these “ABCs” may lower the chances of health problems such as heart attack, stroke, kidney disease, blindness, and amputations.
Home Tools That May Help
Home tools can support safety and early action. These may include a glucose meter, continuous glucose monitor, ketone strips or blood ketone meter, insulin pens or syringes, pump supplies, backup insulin plan, glucagon, thermometer, hydration supplies, medication list, sick-day instructions, and emergency contacts.
A ketone monitor can be especially useful when blood sugar is high, when you are sick, or when symptoms suggest DKA. A blood pressure monitor may help track cardiovascular risk. A medication organizer or reminder app may help with supply planning and daily routines.
Make sure tools are not expired, batteries are charged, prescriptions are current, and caregivers know where supplies are stored.
Common Mistake: Thinking DKA Only Happens With Very High Glucose
DKA often happens with high glucose, but not always. Some people can develop DKA with lower glucose levels, especially during illness, reduced food intake, pregnancy, SGLT2 inhibitor use, or other special circumstances.
This is why symptoms and ketones matter. Nausea, vomiting, abdominal pain, rapid breathing, dehydration, confusion, or feeling very ill should prompt ketone checks and medical guidance, even if glucose is not extremely high.
Follow the ketone plan your diabetes care team gives you.
Common Mistake: Skipping Insulin Because You Are Not Eating
Not eating does not mean the body needs no insulin. People with type 1 diabetes usually still need basal insulin during illness, fasting, or reduced appetite.
Skipping insulin can lead to ketone production and DKA. If you cannot eat, are vomiting, or are unsure how to adjust insulin, call your diabetes care team early.
Use your written sick-day plan instead of guessing.
Common Mistake: Waiting Too Long When Vomiting Starts
Vomiting is one of the most important DKA warning signs because it can worsen dehydration and make it hard to keep fluids down.
Guidelines for ketone-prone people with diabetes emphasize oral hydration, additional rapid-acting insulin when directed, frequent glucose and ketone monitoring, seeking medical advice if symptoms worsen or ketones increase, and going to the emergency room if oral hydration cannot be maintained because of vomiting or mental status changes.
If vomiting continues, ketones are moderate or high, or you cannot keep fluids down, seek urgent medical care.
Common Mistake: Not Having Backup Supplies
DKA risk can rise when insulin, pump supplies, glucose strips, CGM supplies, ketone strips, or batteries run out unexpectedly.
Keep backup supplies when possible and create a plan for travel, school, work, storms, power outages, insurance delays, pharmacy shortages, or device failure.
Ask your care team what supplies should be included in your diabetes emergency kit.
Common Mistake: Managing Diabetes Alone When Support Is Needed
Type 1 diabetes requires daily decisions, and burnout is common. Fear of highs, fear of lows, cost concerns, school or work challenges, disordered eating, depression, anxiety, and device fatigue can all affect safety.
Support may include diabetes education, endocrinology follow-up, nutrition counseling, mental health care, peer support, social work, school plans, workplace accommodations, and pharmacy help.
Asking for support can reduce risk. It is not a sign of failure.
When to Talk to a Healthcare Provider
Talk to a healthcare provider if you have repeated high blood sugars, frequent lows, rising ketones, unclear sick-day instructions, trouble affording insulin, device problems, pump site failures, new exercise plans, pregnancy plans, or symptoms of diabetes burnout.
You should also ask about type 1 diabetes risk screening if you have a close relative with type 1 diabetes or other risk factors and want to understand whether autoantibody testing is appropriate.
A provider may recommend insulin adjustment, CGM review, pump setting changes, ketone plan updates, nutrition support, mental health screening, diabetes self-management education, or referral to endocrinology.
When to Seek Urgent or Emergency Care
Seek urgent or emergency care for moderate or high ketones that do not improve with your care plan, vomiting, inability to keep fluids down, rapid breathing, fruity-smelling breath, confusion, severe weakness, dehydration, chest pain, severe abdominal pain, or symptoms that feel dangerous.
Call emergency services if the person is very drowsy, confused, hard to wake, breathing rapidly, fainting, severely dehydrated, or unable to safely get to care.
Do not wait for a routine appointment if DKA is possible. DKA is a medical emergency.
The Bottom Line
Type 1 diabetes usually cannot be prevented with lifestyle changes, but many complications can be reduced. Early recognition, insulin access, glucose monitoring, ketone testing, sick-day planning, and regular follow-up are central to safety.
DKA prevention starts with never stopping basal insulin without medical guidance, checking ketones when sick or when glucose is high, keeping supplies current, acting early during vomiting or illness, and having a written action plan.
The most common mistakes are thinking DKA only happens with very high glucose, skipping insulin when not eating, waiting too long when vomiting starts, lacking backup supplies, and trying to manage diabetes alone when support is needed.
If you or someone you care for has type 1 diabetes, ask the diabetes care team to review the ketone plan, sick-day plan, emergency supplies, and when to call versus when to go to urgent care.