You choose a Dragonfruit, hopefully this one isn't poisoned or cursed, you hold it and are reluctant for a few seconds, then you take a bite.
You bite into the skin and the flesh and meat, you eventually eat it all, when you do you are stuffed.
Your Penis goes back to full Length, and you don't seem to be changing. It looks like you were lucky this time. THIS Dragonfruit was not poisoned or cursed. It does not ''kill'' you or transform you. It looks like you are not going to turn into a Dragon. THIS time.
It is possible that the other dragonfruit are safe or would have ''killed'' you turning you into a dragon.
This was only one fruit though, You still need to eat all of the other fruits in this aisle that are not poisoned or cursed that are safe and you still have to eat all of the other foods that are not fruit such as vegetables, meat, fish, beans, protein, nuts and etc. before you can get out of this supermarket.
Despite this, you don't have to worry about gaining weight. Your body will automatically burn any and all calolries you ingest while you are still trapped in this supermarket.