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Whether you're in London or Lubbock, a Big Mac is a Big Mac, right? Well, not exactly. Fast food chains [ 1 ] a very different amount of salt in their foods depending on where they're operating.

Researchers studied nutrition information from McDonalds, Burger King, KFC, Domino's, Pizza Hut and Subway in six different countries. They found that restaurants in the U.S. served [ 2 ] burgers, subs, pizza and chicken nuggets than those same [ 3 ] in the U.K.

And the differences were more than a dash. A six-piece chicken nugget in Manchester, New Hampshire, contains 1.5 grams of salt, [ 4 ] in Manchester, England, it has just 0.6 grams—less than half. The findings are in the Canadian Medical Association Journal.

The researchers also found that many of these meals contain more salt than doctors [ 5 ] getting in an entire day. Even salads were not entirely safe, with some containing seven grams of salt.

So, if you can't travel to the U.K. for your drive-thru lunch, cut the salt by cutting your portions—or skipping the fast food altogether.

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