Eating too much unhealthy fat
All the bacon, sausage, cream, lard, butter, and cheese you could ever want? If that's your idea of a healthy low-carb diet, it might sound too good to be true—because it is. While you are technically allowed to enjoy all of these foods that are packed with unhealthy saturated fat, you don't want to make them the backbone of your diet. You won't lose weight and keep it off in the long run by eating blocks of cheese and bacon all day long.
Use these foods judiciously as flavour enhancers, but make sure you're emphasizing heart-healthy fats from foods such as oily fish, avocados, olive oil, chia seeds, and macadamia nuts. When researchers analyzed studies on heart health, they found that swapping out some saturated fats for unsaturated fats can lower the risk of heart attack by 14 percent.
Eating too much processed meat
Processed meats include deli meats, bacon, sausage, and hot dogs. These treats often contain nitrates and nitrites—preservatives that are linked to a higher risk of stomach cancer. Focus on eating minimally-processed meats like fresh chicken, fish, and beef; however, when you do want processed meat, look for versions that are free of nitrates and nitrites. Whatever plan you're on, sticking to fresh, unprocessed foods—as close to their natural state as possible—will be healthier.
14 Low-Carb Diet Mistakes to Avoid, Source:https://www.besthealthmag.ca/best-eats/nutrition/low-carb-diet-mistakes/