Read the following text.

Hero

     Please meet my pet, Hero. Hero is an Iguana. It is a green iguana, but the colour is not green. It is brown with a faint black band around its tail. Hero is 40 cm long and about 2.5 kg.
   Hero likes vegetables very much. It eats water spinach, carrots, cucumber and other vegetables. I sometimes give Hero some small insects. Insects are good for Hero so it will not suffer from osteoporosis.
     Hero looks like a little dragon. It has scales on some parts of its body. It also has strong legs. The strong legs are useful for swimming and climbing trees.
 

Answer the following questions based on the text.

Why does Hero need to eat insects?