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I have heard that one shouldn't reheat a meal with spinach in it. Is there any truth in this and what is the reason?

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Reheating spinach can cause nitrite to be produced. Quote from eufic.org

Spinach and other leafy vegetables contain high concentrations of nitrate. The amount depends on the variety, season, and the soil and water conditions where the vegetable was grown. Nitrate itself is totally harmless, but it can be converted to nitrites, and then to nitrosamines, some of which are known to be carcinogenic. Enzymes present in bacteria convert nitrate to nitrite. This happens especially when spinach is heated, stored and then later reheated. Nitrite itself is a harmless compound, but it should be avoided by infants of up to 6 months. It can affect the ability of the blood to transport oxygen by transforming haemoglobin, the protein that carries oxygen in the blood, into methaemoglobin, a form of the protein which is unable to carry oxygen. This can be dangerous for babies and is commonly known as “Blue Baby Syndrome”. However, in view of the fact that acidic conditions favour the formation of nitrosamines from nitrite, coupled with the facts that nearly all foods contain some protein and are exposed to acid in the stomach nitrosamine production cannot completely be prevented. Hence the recommendation to avoid reheating spinach.

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Great answer. I'd love to see numbers attached - I suspect that's a case of the EU being massively overcautious. –  ceejayoz Jul 20 '10 at 12:42
    
Probably true... –  Tobias Furuholm Jul 20 '10 at 12:56
    
Even so, this would only apply if the spinach dish had a significant bacterial presence. If it is refrigerated after it is cooked, there shouldn't be significant bacterial growth. Seems far fetched. –  Adam Shiemke Jul 20 '10 at 15:04
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As others have said, reheated spinach may contain small amounts of nitrites. These are harmless to adults and children over 6 months, but dangerous for young infants. The upshot is: if you're not serving it to young infants, it should be fine.

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This is what I read too, in a newspaper reporting current research. It added that you still should heat it a lot of times, and you shouldn't do it every day, but that the average person shouldn't worry about it. –  Cerberus Aug 28 '12 at 22:39
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I can think of no reason other than taste.

I've reheated numerous spinach dishes in the past, with no apparent detrimental effects to my health.

Spinach doesn't have any special properties that other greens like beet greens, collards, mustard greens, etc. don't have, so I don't see any reason why spinach would be special in this respect.

Like most greens, it doesn't react well to being overcooked, so when reheating, stir often, and you should be fine.

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