Some dentists note that brushing your teeth immediately after eating an acidic fruit like an orange can damage enamel. If you eat one in the morning, it is best to wait 30 minutes before brushing.
Summary
For most people: Eating an orange in the morning is a healthy choice.
For those with acid reflux: It may cause heartburn.
For diabetics: It should be paired with protein to avoid sugar spikes.
If you saw a specific claim (e.g., "causes liver damage" or "causes arthritis"), that is likely misinformation. Citrus fruits are generally considered protective against chronic diseases.
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