That means we have to study God's word so that we can know what God expects from us, and we can tell others. Our work is to share the knowledge of the truth and help those in need both materially and spiritually. Man's original diet of fresh fruits and vegetables, and nuts and grains is still the best diet for man, and the less cooked food the better. It is much easier than it used to be to get fresh foods. Of course, if you are able to have a garden, that is even better, or even growing a few things in pots.
Every little bit helps.
Originally man communicated with God face to face every day. We still need that daily communion with Him through His word and prayer. We need to be refreshed and fed with His word. Jesus was a man of prayer. He often spent whole nights in prayer.