Travelling when you have a restricted diet can be difficult, especially if you don't speak the local language. NerdWallet suggests carrying a card in your wallet that explains your food restriction in the language of the spots you'll be visiting.
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Do a little research on the common ingredients used in that country's cuisine, too, so you know which dishes you should skip, or what alternatives you may struggle to find. This, coupled with your explainer card, can save you quite a few headaches -- and possibly stomach-aches -- during your trip. For those with life-threatening food allergies, you should also have a medical emergency card on you. Check out the full post for more tips on travelling when you have a restricted diet.
Tips for Travelling with Dietary Restrictions [NerdWallet]