Diabetes affects almost four million people in the UK, and 90 per cent of all cases are caused by type 2 diabetes.
The condition is caused by the pancreas not producing enough of the hormone insulin, or the body not reacting to insulin.
But making some small changes to your diet or lifestyle could lower your chances of developing diabetes.
You may lower your risk of high blood sugar by eating berries every day, it's been claimed.
Berries have numerous health benefits for diabetes patients, according to medical website Diabetes.co.uk.
They contain compounds, known as anthocyanins, that help to improve insulin sensitivity, it added.
Regularly adding berries to your breakfast can turn an unhealthy meal into a healthy one, it said.
"There are certain foods that provide huge health benefits for people with diabetes," said Diabetes.co.uk. "They are often known as 'diabetes superfoods'.
"Several studies have linked berries to a number of health benefits for people with diabetes, particularly type 2 diabetes.
"Berries are also a good source of vitamin C and fibre, and they don't contain many carbohydrates.
"Berries are best incorporated into breakfast or dessert.
"They're a great way of making often unhealthy or carb-heavy meals into something more nutritious."
Eating berries could reduce insulin resistance by 13 per cent, while lowering fasting blood sugar levels by almost nine per cent, scientists have claimed.
Try adding more blueberries, strawberries, blackberries or raspberries to your diet, added the medical website.
"That said, although the research is promising, it isn't yet conclusive," it said. "The signs are good, but the research is ongoing."
Diabetes type 2 symptoms include extreme tiredness, blurred vision, and passing more urine than normal.
Managing blood sugar is crucial for diabetes patients, as they're more at risk of some deadly complications, including strokes and heart attacks.
Eating a healthy, balanced diet could also help to reduce symptoms of diabetes, the NHS said.
Doing regular exercise and taking regular blood tests is crucial to managing your blood sugar.
You should see a GP if you're worried about the signs and symptoms of diabetes.
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