Fruit allergies: Any weird reactions?

Hey everyone, I’m hoping someone here might have some insight because we’re a bit stumped. It’s about my boyfriend. For years, he was convinced he had a fruit allergy—specifically bananas. He once ate one and ended up with these brutal stomach cramps that just wouldn't quit. Then, about a year ago, the exact same thing happened after he had an orange, so he basically blacklisted both from his diet. But get this: I recently whipped up a homemade banana smoothie, he took a few sips, and he was completely fine. We actually thought we’d cracked the code, assuming it wasn't the fruit itself, but rather the pesticides or chemicals used on store-bought produce. However, last night he ate a fresh apple straight from our backyard tree—an old thing that hasn't seen a drop of chemical spray in years—and the reaction was identical to before. Now we’re just totally lost. It doesn't seem to be a specific allergy since the reaction isn't consistent across all fruits, it can't be the pesticides because the apple was "clean," and it's definitely not acidity since bananas don't really fit that profile. Does anyone have any idea what else could be causing this?

Not a single soul? Not even a quick take or an opinion?

It’s certainly possible for raw fruit to cause some discomfort. I’ve found that bananas can be surprisingly heavy on the stomach, and I’ve heard similar things from others regarding oranges. A smoothie might actually be easier for him to handle since it's much more digestible.
It really just comes down to his specific digestive system and what his body can manage. Personally, I struggle with bananas too—especially first thing in the morning—and I have to avoid milk entirely because it doesn't sit right with me, though strangely enough, yogurt is perfectly fine. It truly is an individual thing.
If he's experiencing significant distress, it might be worth seeing a gastroenterologist, even if it turns out to be nothing serious. I know plenty of people who simply cannot tolerate certain fruits or vegetables in their raw state, yet they can eat those exact same foods without any issues once they've been cooked. 🤷

Fruit should be eaten on its own between meals, not right before—and definitely not immediately after a cooked meal.

If they give that a shot, they might actually figure out whether the issue is just poor food timing or if they truly have an intolerance to specific fruits.

maybe check your gallbladder