My late father-in-law ate entire apples-- core and all. I've tried but I can't stomach the texture or how much more the fibrous parts of the core get stuck in my teeth. It doesn't disgust me, I just don't prefer it.
Not to miss an opportunity to talk about apples:
I started eating three apples / day for lunch last year. I hadn't realized how dirty apples are. I assumed the washing they get in processing gets them pretty clean. It does not. I wet them and clean the stem and flower areas with a paper towel. I'm shocked at how dirty the towel ends up.
I'm a sweet apple kind of guy. Envy apples are the bomb. I used to like Honeycrisp but the rumors of their being bred into shitty tastelessness are true. They're terrible. Shockingly, sometimes Red Delicious, which I'd previously relegated to the "buy as a last resort" list, are actually pretty good now. Fuji, Gala, and Cosmic Crisp are all decent specimens.
My wife likes Pink Lady but I think they're just a little too tart. She can also put away the Granny Smiths which I find to be horrifyingly sour. Ick!
Anybody have feelings about other apple varieties a person like me might be into?