High-protein, low-carbohydrate diets, such as the Atkins and Zone diets, have been successful for weight loss in some people. However, according to the American Academy of Family Physicians, after six months low carbohydrate diets are no more successful than other types of weight loss programs. The same source notes that research is insufficient to determine if low-carbohydrate diets are even safe. Unpleasant side effects are common in people following high-protein, low carbohydrate diets.
Dehydration
Dehydration may result from following a low-carbohydrate diet, according to the Mayo Foundation for Medical Education and Research. This is due to the diuretic effect of low-carb diets and loss of water weight. According to the Merck Manual of Medical Information, water is lost when stored carbohydrates are broken down for energy in the body. Therefore, people following a low-carbohydrate or other weight loss diet should drink large amounts of water.
Dizziness
Dizziness is a side effect of following a low-carb diet and may occur with ketosis, a condition that results from fat breakdown in the body, according to the Mayo Foundation for Medical Education and Research. Dizziness from ketosis may occur when following other types of weight loss diets as well.
Bad Breath
Bad breath is an unpleasant side effect that can result from ketosis when following a low-carbohydrate, high protein diet. Ketosis-related bad breath may have a fruity, foul smelling odor.
Headaches
Headaches can occur with any type of weight loss diet, but are common in low-carbohydrate diets, according to the American Academy of Family Physicians. Headaches may also result from dehydration, another side effect of following a high-protein low-carbohydrate diet.
Nausea
Nausea is an unpleasant side effect of ketosis and low-carbohydrate diets, according to the Mayo Foundation for Medical Education and Research.
Fatigue
Fatigue after consuming a high-protein, low-carbohydrate diet may result from ketosis and calorie restriction. Due to a smaller selection of foods to choose from when following a low-carb diet, successful weight loss may be due to reduced calorie consumption.
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