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I was once having a milky coffee at a cafe and I ordered an orange juice. The waiter told me that I should wait until I've finished my coffee, because drinking milk and orange juice together causes the milk to curdle inside your stomach.

  • Is there any evidence of digestion or other problems being caused by drinking orange juice with milk?
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As seen in this experiment milk curdles when lemon juice is added (due to the acid):

enter image description here

Orange juice has a pH level of about 3

so that could curdle the milk.

But

gastric acid has a pH level of 1.5 - 3

Conclusion:
Due to the gastric acid milk would curdle in your stomach anyway.

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  • 6
    Note: milk + lemon = ricotta cheese + milk serum ;-)
    – Sklivvz
    Commented May 7, 2011 at 10:30
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    Of course, it's entirely possible for there to be digestion problems due to something else...
    – BlueRaja - Danny Pflughoeft
    Commented May 7, 2011 at 18:57
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    Both milk and OJ give a lot of people many digestive problems. I'm gonna go with a false causation conclusion, where there is probably at best a weak correlation.
    – user11643
    Commented Feb 20, 2015 at 10:43

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