TYPE 2 DIABETES OVERVIEW
Diabetes mellitus is a chronic condition, but people with diabetes can lead a full life while keeping their diabetes under control. Lifestyle modifications (changes in day-to-day habits) are an essential component of any diabetes management plan.
Lifestyle modifications can be a very effective way to keep diabetes in control. Improved blood sugar control can slow the progression of long-term complications. Multiple small changes can lead to improvements in diabetes control, including a decreased need for medication.
Diabetes requires a lifelong management plan, and persons with diabetes have a central role in this plan. Lifestyle modifications are an opportunity for diabetics to take charge of their health. Therefore, it is important to learn as much as possible about diabetes and to take an active role in making decisions about healthcare and treatment.
ALCOHOL AND TYPE 2 DIABETES
Drinking a moderate amount of alcohol (up to one serving per day for women, up to two servings per day for men) with food does not affect blood sugar levels significantly. People who take oral diabetes medications do not usually need to adjust their medication, as long as the alcohol is consumed in moderation and with food. Alcohol may cause a slight rise in blood sugar, followed hours later by a decrease in the blood sugar level.
Mixers, such as fruit juice or regular cola, can increase blood sugar levels and increase the number of calories consumed in a day. Also, calories from alcohol have little nutritional value and may interfere with efforts to lose weight or contribute to weight gain.
EXERCISE AND TYPE 2 DIABETES
Exercise is beneficial for all individuals, with or without diabetes. Even people with longstanding diabetes or diabetic complications can benefit from exercise.
For diabetics, exercise promotes cardiovascular fitness and weight loss, lowers high blood pressure, improves lipid profiles, improves blood sugar control in some cases, and leads to an overall sense of well-being. When combined with dietary lifestyle intervention it will even help prevent type 2 diabetes in some people.
General exercise precautions — It is important to balance enthusiasm and common sense when beginning an exercise program. These precautions encourage patients to stay safe and ensure that exercise is productive.
Diabetics who use insulin should also:
- Measure blood sugar before, during, and after exercise to determine their body's typical response to exercise. If the pre-exercise blood sugar reading is 250 mg/dL (13.9 mmol/L) or higher, exercise should be postponed until the level is under control.
- Consider a decrease in insulin dose by about 30 percent during exercise.
- Choose an insulin injection site away from exercising muscles (for example, avoid the legs if running).
- Keep rapidly absorbed carbohydrates on hand (glucose tablets, hard candies, or juice).
- Eat a snack 15 to 30 minutes before exercise, and again every 30 minutes during exercise.
- Eat a source of slowly absorbed carbohydrates (dried fruit, fruit jerky, granola bars, or trail mix) immediately after exercise. This will counter a post-exercise drop in blood sugar levels.
The pre-exercise examination — People with diabetes who want to start an exercise program should consult with their healthcare provider first. We typically perform a physical examination and a resting electrocardiogram (ECG) in sedentary adults (age >50 years) with diabetes prior to beginning an exercise program. It is best to begin a gentle exercise program and to gradually progress to a more vigorous program as tolerated.
Type of exercise — Gentle aerobic exercises, which increase the heart rate for a sustained period of time, are often the best choice for diabetics. Examples of aerobic exercise include walking, cycling, swimming, or rowing. Diabetics with well-controlled blood sugar levels and no complications can usually participate in most any type of exercise.
Choose exercise that is enjoyable and can be performed comfortably, making it easier to stay motivated and stick with a program over time. People who are accustomed to a sedentary lifestyle may find it particularly challenging to start and continue with an exercise program. Talk with a healthcare provider about any barriers that stand in the way of exercise; he or she may be able to suggest solutions.
People with diabetic eye complications (proliferative retinopathy) may be advised to avoid high-impact activities and strenuous weight-lifting, which can increase blood pressure and cause bleeding in the eye. People with neurologic complications (peripheral neuropathy) are usually advised to avoid traumatic weight-bearing exercises such as running, which can lead to foot ulcers and stress fractures although this depends on the severity of the nerve damage. (See "Patient information: Diabetic neuropathy (Beyond the Basics)".)
Intensity — Exercise does not have to be intense to be beneficial. Persons who want to increase the intensity of exercise should do so gradually, and should stop if he or she experiences worrisome symptoms, such as chest discomfort or nausea.
Duration — A reasonable exercise session consists of 10 minutes of stretching and warm-up, followed by 20 minutes of gentle aerobic exercise. Eventually, you may wish to exercise for more than 30 minutes at a time. You should increase the duration of exercise gradually.
Timing — People who take insulin should try to exercise at the same time of the day. This practice can help to maintain predictable blood sugar levels.
Frequency — Most of the benefits of exercise for people with diabetes require a regular, long-term exercise program. Patients should commit to exercising 30 minutes a day most days of the week.
Over 25 percent of people newly diagnosed with diabetes are smokers. Quitting smoking is one of the most important things a patient can do to improve their health. (See "Patient information: Quitting smoking (Beyond the Basics)".)
Smokers with diabetes have an increased risk of the following:
Diabetics who quit smoking can decrease their risks. Most people who smoke find it difficult to quit; assistance is available from a number of sources. Healthcare providers have access to self-help materials, and can help select a quit date, provide contact information for local support groups, and prescribe nicotine replacement treatment, if needed.
DIET AND TYPE 2 DIABETES
Changing the type and amount of food eaten can help people with diabetes to lose weight, improve blood sugar control, and lower blood cholesterol levels and blood pressure. A separate topic discusses these issues in detail. (See "Patient information: Type 2 diabetes mellitus and diet (Beyond the Basics)".)
MEDICATIONS AND BLOOD SUGAR MONITORING IN TYPE 2 DIABETES
The day-to-day management of blood sugar levels can be complicated. The daily regimen may include oral medications and/or insulin, blood sugar monitoring, and carefully planned meals and snacks.
However, successful management of diabetes does not have to take the enjoyment out of life. It can be difficult to establish a routine that incorporates all aspects of diabetes care, although many people find that the routine becomes second nature over time. Written schedules may help patients to remember the details of a routine until they are committed to memory. It is also important to carefully manage situations that can complicate blood sugar control, such as sick days and vacations.
People with diabetes may need to take several medications throughout the day. Medications to lower high blood pressure, lower cholesterol levels, and low-dose aspirin may be used to manage and prevent complications. Each prescription should be taken exactly as directed on a daily basis. If the medication schedule is complex, a pill organizer or written outline may be helpful in remembering to take specific medications at specific times.
ROUTINE MEDICAL CARE IN TYPE 2 DIABETES
Making changes in diet and exercise are an important step in diabetes management. However, routine medical care is also important to long-term health for people with diabetes, particularly when it comes to preventing, detecting, and slowing the progression of complications. A healthcare provider can recommend a regular schedule for visits, screening, and monitoring tests based upon the duration of the disease, any complications, and other medical problems.
Your healthcare team will periodically reevaluate your management plan, and can work to detect health problems that do not cause symptoms in the early stages.
Regular screening for non-diabetes related health problems is also recommended.
WHERE TO GET MORE INFORMATION
Your healthcare provider is the best source of information for questions and concerns related to your medical problem.
This article will be updated as needed on our web site (www.uptodate.com/patients). Related topics for patients, as well as selected articles written for healthcare professionals, are also available. Some of the most relevant are listed below.
Patient level information — UpToDate offers two types of patient education materials.
The Basics — The Basics patient education pieces answer the four or five key questions a patient might have about a given condition. These articles are best for patients who want a general overview and who prefer short, easy-to-read materials.
Patient information: Type 2 diabetes (The Basics)
Patient information: Treatment for type 2 diabetes (The Basics)
Patient information: Diabetes and diet (The Basics)
Patient information: Preventing type 2 diabetes (The Basics)
Beyond the Basics — Beyond the Basics patient education pieces are longer, more sophisticated, and more detailed. These articles are best for patients who want in-depth information and are comfortable with some medical jargon.
Patient information: Foot care in diabetes mellitus (Beyond the Basics)
Patient information: Self-blood glucose monitoring in diabetes mellitus (Beyond the Basics)
Patient information: Diabetic neuropathy (Beyond the Basics)
Patient information: Quitting smoking (Beyond the Basics)
Patient information: Peripheral artery disease and claudication (Beyond the Basics)
Patient information: Type 2 diabetes mellitus and diet (Beyond the Basics)
Patient information: Cervical cancer screening (Beyond the Basics)
Patient information: Breast cancer screening (Beyond the Basics)
Patient information: Bone density testing (Beyond the Basics)
Patient information: Prostate cancer screening (Beyond the Basics)
Patient information: Colon and rectal cancer screening (Beyond the Basics)
Professional level information — Professional level articles are designed to keep doctors and other health professionals up-to-date on the latest medical findings. These articles are thorough, long, and complex, and they contain multiple references to the research on which they are based. Professional level articles are best for people who are comfortable with a lot of medical terminology and who want to read the same materials their doctors are reading.
Effects of exercise in diabetes mellitus in adults
Nutritional considerations in type 1 diabetes mellitus
Nutritional considerations in type 2 diabetes mellitus
Overview of medical care in adults with diabetes mellitus
Prepregnancy evaluation and management of women with type 1 or type 2 diabetes mellitus
Smoking and cardiovascular risk in diabetes mellitus
The following organizations also provide reliable health information.
- National Library of Medicine
- National Institute of Diabetes and Digestive and Kidney Diseases
- American Diabetes Association (ADA)
(www.hormone.org/public/diabetes.cfm, available in English and Spanish)