What causes people to fail on the low carb diets? healthyfitmom thinks that people don’t have proper knowledge about low carb diets. People don't know its dietary benefits, its nutritional values, etc. Another cause can be the ignorance of people about cooking. They don't know what to eat. Another aspect can be people tend to avoid fats in their diet. This is not the right way. We should take all the nutrients in our diet. Infact, fat suppress our cravings for food. you should also take proteins in your diet, because proteins are slowly digested by our body and keeps a check on our cravings.