A moderate low-carb diet can help patients lose weight and improve serious health conditions, such as diabetes, high blood pressure and cardiovascular disease, according to Mayo Clinic. However, diets that severely restrict carbohydrates can cause health issues, including vitamin or mineral deficiencies, weakness, fatigue and headaches.
Since most professional research studies regarding low-carb diets have lasted less than a year, long-term effects of low-carb diets are not clear, explains Mayo Clinic. Restricting carbohydrates to less than 20 grams daily can result in ketosis, and ketosis side effects include nausea, headaches, fatigue, mental fatigue and bad breath.
Some studies have shown that patients lose more weight on low-carb diets than traditional diets because consuming extra protein and fats help dieters feel fuller for a longer period of time, reports Mayo Clinic.