Autism sometimes has a symptom of not noticing when one is hungry. This becomes more prominent when engrossed in an activity. Like, you could be gaming or reading or whatever and the material interests you so much that you don't even notice the rumble in your tummy. Or it could be a sensory thing, where textures and tastes of foods make you sick and eating is just unappealing for that reason
About words not coming out properly, from personal experience social anxiety and a delay between thoughts and speech affect my ability to speak out when necessary.