That said, the reasons for autism are not well understood, and there may be many different root causes that lead to the umbrella diagnosis.
Additionally, experiences vary widely -- some autistic folks do not ever feel hungry and must be reminded to eat (or build support systems for it). Others do not ever feel full and must be reminded to not eat (or build support systems for it). Interoception (the perception of your body's internal signals) is impaired for many autistic folks.
Some of us experience misophonia, and get extreme fight or flight responses to audio signals -- personally, I get extremely agitated if I hear someone eating with their mouth open. (To be clear, it's not annoyance. It's fear/anger/hate/danger sense.)
Right now autism and neurodivergent cover huge swaths of behaviors/traits. This is especially true in the "social arena".
Just like back in the day when every kid that bounced their leg got an ADHD diagnosis. Now we know ADHD presents in a ton of ways and is usually present with other personality traits.