from the food standards agency:
Do olives count towards the five portions of fruit and veg we should eat each day?
All types of fruit and vegetables, whether they are fresh, chilled, frozen, canned, bottled or dried, count towards our daily portions.
A portion is about 80 grams of fruit or vegetables - when you've removed all the bits you can't eat such as inedible peel or stones.
Olives are the fruit of the olive tree and contain fibre as well as some vitamins and minerals. However, because olives are quite small and weigh very little, you would need to eat about 30 olives to get a portion!
It's better to eat olives in small quantities because they are generally high in salt. And we should all avoid eating too much salt. This is because salt contains sodium, and having too much sodium can increase the risk of high blood pressure, which increases the risk of heart disease and stroke.
So olives can count towards a portion. For example, you could eat a few olives as part of a dessert-sized bowl of mixed salad - together this counts as one portion. Or if you eat them as part of a pizza topping with two to three tablespoonfuls of vegetables - such as mushrooms, peppers and tomatoes - this would count as a portion too.