Whether low carbing is an option when travelling abroad depends on many factors, including the country you are visiting, the location, length of stay, local cuisine, whether you are going to a small town or city, your diet of choice, and other factors. For example, you may pack some low carb foods for your stay if you are coming back in 5 days - see some examples here - http://www.lowcarbfoods.org/what+foods+eat+low+carb+diet/. This is not a feasible option if you plan to stay a couple of months.
Foods That Are Easy to Pack and Keep in Your Hotel Room
Examples of foods that are easy to pick up and store include sliced deli meats, olives, cheese, vegetables, and dips. This is provided that you have a fridge in your room. If not, you may want to pack jerky, nuts, and peanut butter. Bring foods with a long shelf life. The products to pack depend on the local climate and whether you will be able to cook. If your hotel room or apartment has a kitchen or kitchenette, you have more options. If not, focus on “survival foods”.
Whether you are travelling to Fiji or Spain is an important consideration. Most countries in Europe are low-carb friendly. Some cuisines offer more choice than others. You have plenty of choice if you are going on a trip to Greece, Italy, or another country in the Mediterranean region. If you follow the Mediterranean Diet (http://www.health.com/health/gallery/0,,20718485,00.html), you can consider yourself lucky because the plan is based on foods and dietary patterns that are traditionally associated with the region. You can have salads, seafood, lean meat, and nuts and seeds. Choose fresh, locally grown foods. If you are going to Mexico, China, or Japan, low carbing is not that difficult. Avoid breaded meats and meals that contain bread crumbs, white flour, and thickeners when dining out. Buy plenty of fresh vegetables, salads, and seafood at the local grocery store.
If travelling to China, it is easy to east low carb there. The local cuisine is heavy in eggs, fish, chicken, and fresh vegetables such as broccoli and cabbage. Avoid noodle dishes and rice. Few Chinese restaurants serve desserts or at least you won’t find that much of a variety. You can always have fresh fruits which are good for your health (some diets ban fruits during the initial phase, however). If you are worried about cultural or language barriers or the lack of meal options, you can always bring some Atkins bars with you. Keep in mind that it would be offensive to refuse certain foods and meals in some countries. This means eating off plan on certain occasions like business meetings, conferences, or when visiting friends.