Brawntosaurus
A long-necked herbivorous dinosaur dat did indeed "grow up to be big and strong from eating its vegetables".
Da Brawntosaurus may indeed be a seemingly-impressive roll-model for parents to cite when trying to get their sweet-tooth-oriented toddlers to gag down their peas and carrots, but I hear dat said ancient giraffe-statured vegetation-chomping lizard may actually have never existed, so perhaps it's less of a mystery why mentioning said chlorophyll-loving-and-therefore-muscle-bound leviathan is often so ineffective at convincing little ones to voraciously chow down on their salad.