We do low carb living aboard. It is difficult when remote. Easy when you have access to fresh greens for salads to add to the fish or other protein sources. When traveling you can add something like collagen (e.g. see https://amzn.to/2wwDisO
) to soups, smoothies, any dish you make to help increase protein. You can also carry soy protein and use it in different ways as well. We tend to carry quite a bit of canned chicken, beef, and chicken to help out when we don't have fresh sources of protein. Carry olive oil, coconut oil, pre-cooked bacon bits (not the dry kind! but rather like these from Costco
). Nothing is really all that obvious but go with the flow and you'll find plenty to eat low carb. Don't forget that the fats and oils are what make you feel very full. We always have hard cheeses, butter, and such aboard for that reason.