The two main problems with low-carb diets are that they can be hard to follow and they may not be effective for everyone. The first problem with low-carb diets is that they can be hard to follow. This is because they are very restrictive and you may miss out on important nutrients. It's also easy to overeat on high-fat foods like meat and cheese while following a low-carb diet. The second problem with low-carb diets is that they may not be effective for everyone. This is because not all bodies respond the same way to low-carb diets. Some people may find that they actually gain weight while following a low-carb diet due to the high-fat foods they're eating.