My dear students, are you sometimes confused about “fruit” and “fruits”?

Here is a good text  that teach you how to use “fruit” and “fruits” quoted from http://www.vocabulary.cl/english/fruit.htm.

The word Fruit is a noun. The word is an exception where the noun is both countable and uncountable. So the plural of Fruit can be either Fruit OR Fruits.

When we think of Fruit as a group collectively and in a non-specific way, then we tend to use the word Fruit (without S).

• You should eat five servings of fruit and vegetables every day.
• Fruit is good for your health.
• Would you like some fruit?
• There isn’t much fresh fruit available in winter.

If you are emphasising the different kinds of fruit, then you can use fruits.

• My three favorite fruits are bananas, melons and strawberries.
• The supermarket has a wide selection of exotic fruits such as Papaya and Mango.
• The juice is made from a variety of fresh fruits.
• I love oranges and other citrus fruits.

If you are not sure which to use, the safest thing is to just use Fruit all the time.