Fruit has been a staple of the Animal Crossing franchise from the outset, but it really hasn’t served much of a purpose. Sometimes villagers request it from you and you can always sell it at Nook’s Cranny, but beyond that and the rotten fruit that was introduced in New Leaf, it hasn’t had much use. Eating it has merely been something to do, until now.
Fruit can still be sold for bells or buried to make new fruit tress, but when you eat fruit in New Horizons, you gain limited-use super strength. For each piece you get, you get one powerful strike. This is an incredibly powerful tool if there are boulders on your island you’d wish rather not be there. Eat a piece of fruit and give the rock one good whack with your shovel and it’ll shatter into pieces. If you’re lucky enough to break a money rock, you’ll earn all the bells inside of it.
Source: Destructoid Beware of when you eat fruit in Animal Crossing: New Horizons