A recent report has suggested that small changes in diets can reduce the chances of developing diseases.
However, Liz O'Neil, head of communications at the Vegetarian Society, encouraged people to maintain a wide range of foodstuffs in their diet in order to gain the most nutritional value from their meals.
"Everyone should focus on eating a varied diet with plenty of different vegetables, fruits, grains, pulses and other kinds of food," said Ms O'Neil.
She added: "It's all about balance and focusing on the specific nutritional qualities of a single foodstuff is something of a distraction."
In February, the Office for National Statistics revealed that only 25 per cent of men and 29 per cent of women are meeting the government's five-a-day guidelines when it comes to fruit and vegetables.