Broccoli could be one of the key ingredients in reducing the risk of type 2 diabetes, research has revealed.
A daily dose of green leafy vegetables such as spinach, kale, cabbage and sprouts could slash the risk by 14%.
This type of vegetable is full of magnesium and antioxidants which are linked to reduced levels of diabetes.
People's intake of leafy vegetables was compared with six previous studies by experts from Leicester University.
They found those who consumed more than one serving a day had a lower risk of diabetes than people who barely ate any.
The current UK recommendation is for people to eat five portions of fruit and vegetables a day, with one portion weighing 80g.
"Increasing consumption of green leafy vegetables by one and a half UK portions a day (121.9g) could result in a 14% reduction in the incidence of type 2 diabetes," the experts said.
They concluded that eating certain foods could have a protective effect but said studies on vitamin supplements had proved "disappointing".
Their review failed to find any significant benefit from increasing consumption of vegetables in general, fruit, or fruit and vegetables combined.
Nevertheless, the researchers said other studies have shown "fruit and vegetables are important components of the dietary patterns associated with a decreased risk of type 2 diabetes" and they contributed to a lower risk of heart disease.
The latest study included more than 223,000 people and was published online in the British Medical Journal.