Question

Why does our glands, stomach and intestine makes digestive juices to break down complex substances into simpler ones, if they are made again complex substances when it is absorbed by our body?

Answer 1

so that our body can absorb nutrients which are required to generate energy that's why our body break down complex food into simpler ones

Answer 2

$\sf \pmb{Answer :}$

so that our body can absorb nutrients which are required to generate energy that's why our body break down complex food into simpler ones