How do I get my child with autism/ADHD to eat?

He just won’t eat. I’m concerned for his health. He is 4 and today all he has eaten is:

Bread with avocado on it

Some mango slices

Goldfish

Some watermelon slices

A piece of cheddar cheese

He just WON’T eat. He’s very skinny at 4 years old and can fit into size 24 months pants.