Heart Fruit

As the Yoshis in Yoshi's Story look for the Super Happy Tree, they follow a trail of fruits. One of these fruits is the Heart Fruit. The Heart Fruit makes Yoshi invincible and stronger. The fruit can also give the Yoshi some health. The Heart Fruit looks like a red heart with a face on it. Some are big, some are small.

Purpose
The Heart Fruit is the fuel for the Super Happy Tree. Without it, the tree wouldn't be a happy tree and the Yoshis on the island wouldn't be happy.