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Diabetes is a lifelong condition that causes a person's blood sugar level to become too high.

The hormone insulin – produced by the pancreas – is responsible for controlling the amount of glucose in the blood

There are two main types of diabetes:

  • type 1 – where the pancreas doesn't produce any insulin
  • type 2 – where the pancreas doesn't produce enough insulin or the body's cells don't react to insulin

These pages are about type 2 diabetes. Read more about type 1 diabetes.

Another type of diabetes, known as gestational diabetes, occurs in some pregnant women and tends to disappear after birth.

Symptoms of diabetes

The symptoms of diabetes occur because the lack of insulin means glucose stays in the blood and isn't used as fuel for energy.

Your body tries to reduce blood glucose levels by getting rid of the excess glucose in your urine.

Typical symptoms include:

  • feeling very thirsty
  • passing urine more often than usual, particularly at night
  • feeling very tired
  • weight loss and loss of muscle bulk

Read more about the symptoms of type 2 diabetes.

It's very important for diabetes to be diagnosed as soon as possible as it will get progressively worse if left untreated.

Read about how type 2 diabetes is diagnosed.

See your GP if you think you may have diabetes

Find your GP’s contact details

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Causes of type 2 diabetes

Type 2 diabetes occurs when the body doesn't produce enough insulin to function properly, or the body's cells don't react to insulin. This means glucose stays in the blood and isn't used as fuel for energy.

Type 2 diabetes is often associated with obesity and tends to be diagnosed in older people. It's far more common than type 1 diabetes.

Type 2 diabetes - Causes

Type 2 diabetes occurs when the pancreas doesn't produce enough insulin to maintain a normal blood glucose level, or the body is unable to use the insulin that is produced (insulin resistance).

The pancreas is a large gland behind the stomach that produces the hormone insulin. Insulin moves glucose from your blood into your cells, where it's converted into energy.

In type 2 diabetes, there are several reasons why the pancreas doesn't produce enough insulin.

Risk factors for type 2 diabetes

Four of the main risk factors for developing type 2 diabetes are:

  • age – being over the age of 40 (over 25 for south Asian people)  
  • genetics – having a close relative with the condition, such as a parent, brother or sister
  • weight – being overweight or obese
  • ethnicity – being of south Asian, Chinese, African-Caribbean or black African origin, even if you were born in the UK

These four risk factors are discussed in more detail below. 

Read about reducing your risk of type 2 diabetes.

Age

Your risk of developing type 2 diabetes increases with age. This may be because people tend to gain weight and exercise less as they get older.

Maintaining a healthy weight by eating a healthy, balanced diet and exercising regularly are ways of preventing and managing diabetes.

White people over the age of 40 have an increased risk of developing the condition. People of south Asian, Chinese, African-Caribbean and black African descent have an increased risk of developing type 2 diabetes at a much earlier age.

However, despite increasing age being a risk factor for type 2 diabetes, over recent years younger people from all ethnic groups have been developing the condition.

It's also becoming more common for children – as young as seven in some cases – to develop type 2 diabetes.

Genetics

Genetics is one of the main risk factors for type 2 diabetes. Your risk of developing the condition is increased if you have a close relative such as a parent, brother or sister who has the condition.

The closer the relative, the greater the risk. A child who has a parent with type 2 diabetes has about a one in three chance of also developing the condition.

Being overweight or obese

You're more likely to develop type 2 diabetes if you're overweight or obese with a body mass index (BMI) of 30 or more.

Fat around your tummy (abdomen) particularly increases your risk. This is because it releases chemicals that can upset the body's cardiovascular and metabolic systems.

This increases your risk of developing a number of serious conditions, including coronary heart disease, stroke and some types of cancer.

Measuring your waist is a quick way of assessing your diabetes risk. This is a measure of abdominal obesity, which is a particularly high-risk form of obesity.

Women have a higher risk of developing type 2 diabetes if their waist measures 80cm (31.5 inches) or more.

Asian men with a waist size of 89cm (35 inches) or more have a higher risk, as do white or black men with a waist size of 94cm (37 inches) or more.

Use the BMI calculator to find out if you're a healthy weight for your height.

Exercising regularly and reducing your body weight by about 5% could reduce your risk of getting diabetes by more than 50%.

Read information and advice about losing weight.

Ethnicity

People of south Asian, Chinese, African-Caribbean and black African origin are more likely to develop type 2 diabetes.

Type 2 diabetes is up to six times more common in south Asian communities than in the general UK population, and it's three times more common among people of African and African-Caribbean origin.

People of south Asian and African-Caribbean origin also have an increased risk of developing complications of diabetes, such as heart disease, at a younger age than the rest of the population.

Other risks

Your risk of developing type 2 diabetes is also increased if your blood glucose level is higher than normal, but not yet high enough to be diagnosed with diabetes.

This is sometimes called pre-diabetes, and doctors sometimes call it impaired fasting glycaemia (IFG) or impaired glucose tolerance (IGT).

Pre-diabetes can progress to type 2 diabetes if you don't take preventative steps, such as making lifestyle changes. These include eating healthily, losing weight if you're overweight, and taking plenty of regular exercise.

Women who have had gestational diabetes during pregnancy also have a greater risk of developing diabetes in later life.

Treating type 2 diabetes

As type 2 diabetes usually gets worse, you may eventually need medication – usually tablets – to keep your blood glucose at normal levels.

Type 2 diabetes - Treatment

Treatment for diabetes aims to keep your blood glucose levels as normal as possible and control your symptoms to prevent health problems developing later in life.

If you've been diagnosed with type 2 diabetes, your GP will be able to explain your condition in detail and help you understand your treatment.

They'll also closely monitor your condition to identify any health problems that may occur. If there are any problems, you may be referred to a hospital-based diabetes care team.

Making lifestyle changes

If you're diagnosed with type 2 diabetes, you'll need to look after your health very carefully for the rest of your life.

This may seem daunting, but your diabetes care team will be able to give you support and advice about all aspects of your treatment.

After being diagnosed with type 2 diabetes, or if you're at risk of developing the condition, the first step is to look at your diet and lifestyle and make any necessary changes.

Three major areas that you'll need to look closely at are:

You may be able to keep your blood glucose at a safe and healthy level without the need for other types of treatment.

Lifestyle changes

Diet

Increasing the amount of fibre in your diet and reducing your sugar and fat intake, particularly saturated fat, can help prevent type 2 diabetes, as well as manage the condition if you already have it.

You should:

  • increase your consumption of high-fibre foods, such as wholegrain bread and cereals, beans and lentils, and fruit and vegetables
  • choose foods that are low in fat – replace butter, ghee and coconut oil with low-fat spreads and vegetable oil
  • choose skimmed and semi-skimmed milk, and low-fat yoghurts
  • eat fish and lean meat rather than fatty or processed meat, such as sausages and burgers
  • grill, bake, poach or steam food instead of frying or roasting it
  • avoid high-fat foods, such as mayonnaise, chips, crisps, pasties, poppadoms and samosas
  • eat fruit, unsalted nuts and low-fat yoghurts as snacks instead of cakes, biscuits, bombay mix or crisps

The Diabetes UK website has more information and advice about healthy eating.

Weight

If you're overweight or obese – you have a body mass index (BMI) of 30 or over – you should lose weight by gradually reducing your calorie intake and becoming more physically active.

Losing 5-10% of your overall body weight over the course of a year is a realistic initial target.

You should aim to continue to lose weight until you've achieved and maintained a BMI within the healthy range, which is:

  • 18.5-24.9kg/m² for the general population
  • 18.5-22.9kg/m² for people of south Asian or Chinese origin – south Asian includes people from Bangladesh, Bhutan, India, Indian-Caribbean, Maldives, Nepal, Pakistan and Sri Lanka

If you have a BMI of 30kg/m² or more (27.5kg/m² or more for people of south Asian or Chinese origin), you need a structured weight loss programme, which should form part of an intensive lifestyle change programme.

To help you achieve changes in your behaviour, you may be referred to a dietititian or a similar healthcare professional for a personal assessment and tailored advice about diet and physical activity.

Physical activity

Being physically active is very important in preventing or managing type 2 diabetes.

For adults who are 19-64 years of age, the government recommends a minimum of:

  • 150 minutes (2 hours and 30 minutes) of moderate-intensityaerobic activity – such as cycling or fast walking – a week, which can be taken in sessions of 10 minutes or more, and
  • muscle-strengthening activities on two or more days a week that work all major muscle groups – the legs, hips, back, tummy (abdomen), chest, shoulders and arms

An alternative recommendation is to do a minimum of:

  • 75 minutes of vigorous-intensity aerobic activity, such as running or a game of tennis every week, and
  • muscle-strengthening activities on two or more days a week that work all major muscle groups – the legs, hips, back, abdomen, chest, shoulders and arms

Read more about the physical activity guidelines for adults.

In cases where the above activity levels are unrealistic, even small increases in physical activity will be beneficial to your health and act as a basis for future improvements.

Reduce the amount of time spent watching television or sitting in front of a computer. Going for a daily walk – for example, during your lunch break – is a good way of introducing regular physical activity into your schedule.

If you're overweight or obese, you may need to be more physically active to help you lose weight and maintain weight loss.

Your GP, diabetes care team or dietitian can give you more information and advice about losing weight and becoming more physically active.

The Diabetes UK website has more information and advice about getting active and staying active.

Complications of type 2 diabetes

Diabetes can cause serious long-term health problems. It's the most common cause of vision loss and blindness in people of working age.

Everyone with diabetes aged 12 or over should be invited to have their eyes screened once a year for diabetic retinopathy.

Diabetes is also responsible for most cases of kidney failure and lower limb amputation, other than accidents.

People with diabetes are up to five times more likely to have cardiovascular disease, such as a stroke, than those without diabetes.

Read more about the complications of type 2 diabetes.

Preventing type 2 diabetes

If you're at risk of type 2 diabetes, you may be able to prevent it developing by making lifestyle changes.

These include:

Living with type 2 diabetes

If you already have type 2 diabetes, it may be possible to control your symptoms by making the above changes. This also minimises your risk of developing complications.

Read more about living with type 2 diabetes.


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