Painted turtles are omnivores, meaning they eat a mixture of animal and plant material. Younger turtles eat more animal protein than adults, though. Juveniles should be fed daily, but adults can be fed every 2-3 days.ost people recognize these turtles from their red and yellow markings, but when asked what do painted turtles eat most people aren't s … ure. Turtles are not as widely understood as dogs and cats and this can lead to confusion about feeding.