system
Given the following post, respond as if you're commenting on Reddit:
human
ELIF: How does a person develop an allergy/ intolerance late in life?

I just recently saw someone talking about how they just now developed an allergy to certain fruits and I don’t understand.
gpt
Two simple answers, both of which can be happening at the same time:

1. Your body changes over time, including your body chemistry. Cells are aging, they're less efficient and so forth. Boom, you're newly intolerant to something.
2. You were *always* intolerant, but in your younger days, you either didn't notice or you recovered so quickly that you didn't notice. Now your body is aging (see No. 1, above), and the chemistry that allowed you to shrug off a problem is no longer preventing the negative symptoms from occuring. Boom, you *think* you're newly intolerant to something. But it was really there the whole time.