lilies and grass, health, and style are matters to modern people.
However, Jesus put paradoxical comments that “..do not be anxious about your life, what you will eat, nor about your body, what you will put on” (ESV, Luke 12:22).
Rather, he emphasizes life that is a priority over everything by explaining the futility of worrying.
Also, Jesus explains lilies and grass which shows God cares for creatures dying soon. That means God, even more, cares for and feeds human nature.