If you have tried carbohydrate reduction and it didn’t work for you, or you didn’t like, or you don’t agree with it in principle, you might just want to skip this. This information is provided for people who are curious about the possible health benefits of carbohydrate reduction, or for those who have tried it, liked it, and want to share some information about it with friends. I welcome corrections and suggestions from anyone who has them for me, but I am not interested in arguing the merits or drawbacks of this approach to health. I’m sure if you look around, you’ll find someone else who is.
What is carbohydrate anyway?
There are three classes of molecules or “macronutrients” in food—protein, fat, carbohydrate—and all three have two basic functions in the body.
- To provide energy in the form of calories
- To build and maintain structures and/or regulate processes in the body
The primary role that carbohydrate foods play in our diet is to provide energy. However, carbohydrate also plays a very important role in how we store energy from the food we eat. Simply put, if you eat more food than your body needs for immediate energy use, the carbohydrate signal in some foodswill tell the body to store the extra energy, mostly as fat. If you eat few carbohydrate foods to begin with, your body is less likely to store fat because that signaling process isn’t triggered. Foods with a lot of carbohydrate are usually plant-based items like pasta, cereal, breads, fruits, and starchy vegetables because sugars and starches are how plants store energy. Animal-based foods naturally have less carbohydrate content because animals store most of their energy as fat. Because our taste buds find fat and carbohydrate to be an attractive pairing, foods with fat are frequently also high in carbohydrate. For instance, we think of French fries as being “fatty,” but more of the calories in French fries come from carbohydrate than fat.
How does eating high-carbohydrate foods affect my health?
All dietary carbohydrates, even whole grains, raise blood sugar levels; the end product of all digestible carbohydrate food is a simple sugar, namely glucose. Elevated blood sugar (glucose) causes the pancreas to produce insulin. For many people, eating carbohydrate foods can cause an excessive insulin response. Insulin levels can go up more and remain elevated longer than normal. Eventually, the cells become resistant to the insulin signal.
Insulin tells your body to store fat. More importantly, it also prevents your body from burning fat that is already stored. When insulin is constantly elevated, because of a metabolic disorder or because of chronic ingestion of nutritionally-empty dietary carbohydrate, the body has many opportunities to store fat and block fat from being used as energy. This metabolic situation prevents weight loss, promotes weight gain, and contributes to fatigue and low energy levels.
What is a reduced-carbohydrate diet?
The current national standard for recommended daily intake for carbohydrates is 130 grams/day. Anything below that can be considered a reduced-carbohydrate diet, although Americans typically eat two to three times that amount in a day . The benefits of carbohydrate reduction seem to be continuous; as carbohydrates are reduced, health benefits usually increase. However, for those addressing health concerns such as diabetes, Metabolic Syndrome, and abnormal lipids, there is usually a threshold effect. In other words, dietary carbohydrates don’t have to be eliminated, just lowered to the point that an individual is able to achieve his or her health goals.
For some people, there is a maximum benefit at very low carbohydrate levels, which is why early phases of popular reduced-carbohydrate diets target very low carbohydrate levels ; however, some people may achieve similar benefits at higher levels of dietary carbohydrate. Reduced-carbohydrate diets do not necessarily require higher fat or protein intakes; in many cases, little protein or fat is added back in for the carbohydrate that is removed .
Most reduced-carbohydrate diets aim for a level of less than 60 grams of carbohydrates, as that is the level at which the body begins to rely on fat and ketones for fuel instead of carbohydrates (this is called being “in ketosis”). A very low-carbohydrate diet will keep carbohydrate intake at around 20 to 30 grams/day. At this level, almost everyone will be successful in regulating blood sugar and lowering insulin levels and losing weight. It is important to note that many people who are not overweight or do not have any other metabolic conditions or chronic illnesses can also benefit from reducing the carbohydrate in their diet. This type of “reduced carbohydrate diet” would contain up to 45% of calories from carbohydrate, still considerably less than the 50 to 65% that the USDA Dietary Guidelines recommend.
Moderate carbohydrate diet: Over 130 grams carbohydrate per day, up to 45% of total calories.
Reduced-carbohydrate diet: Contains 30 to 130 grams of carbohydrate per day; may or may not induce ketosis.
Low-carbohydrate (ketogenic) diet: Contains less than 30 grams of carbohydrate per day; will usually permit ketosis to occur.
What is ketosis and how does it affect my body?
Ketosis occurs when your body switches from burning carbohydrates to burning fat for fuel. It can occur during any period of reduced energy intake, such as an overnight fast or during any weight loss program. One of the by-products of the fat-burning process is ketones, which your body uses for fuel. Ketosis is not harmful, and in fact may have some benefits, such as improved weight loss, suppressed appetite, and increased energy levels. As long as protein intake is sufficient, concerns that ketosis causes muscle loss, “starves” the brain, or otherwise damages your health are unfounded. You can measure your ketone levels with test strips from the drugstore if you are interested.
Ketosis should not be confused with ketoacidosis, a situation where ketones are present in the blood when blood sugar levels are elevated. This can happen in unusual conditions, such as with poorly-controlled type 1 diabetes or with excessive alcohol consumption in conjunction with type 2 diabetes.
How can reducing dietary carbohydrate improve my health?
Most people are familiar with reduced-carbohydrate diets through popular weight loss books. In fact, reduced-carbohydrate diets, when used appropriately, have consistently been shown to be more effective for weight loss when compared to other types of diets [5, 6, 7]. People who have had difficulty losing weight in the past can often find success with a reduced-carbohydrate diet, as this type of diet specifically addresses the metabolic conditions that lead to weight gain in the first place. For weight loss purposes, reduced-carbohydrate or low-carbohydrate diets seem to be more effective than a moderate carbohydrate diet; in reduced-carbohydrate weight loss studies, weight loss slows and weight is regained with the re-introduction of carbohydrates into the diet .
This does not mean that “calories don’t count” on a reduced-carbohydrate diet. When insulin levels remain low, there is no efficient storage mechanism for extra calories. At the same time, consuming more energy than is needed will prevent the body from using its body fat stores for energy requirements. Reducing nutritionally-empty carbohydrates will reduce both calories and carbohydrates and may provide health benefits that go beyond weight loss.
Beyond weight loss
Weight is not the only thing that can improve when excess carbohydrates are reduced in the diet. Many people report increased energy and reduced hunger on a low or reduced-carbohydrate diet. During comparative diet studies, those who are placed on a reduced-carbohydrate diet typically consume fewer calories than other dieters despite the fact that caloric intake is not restricted on a reduced-carbohydrate diet [6, 7, 8, 9]. Proper nutrition that provides adequate protein and fat, stabilizes blood sugar, and reduces insulin levels can contribute to a general feeling of improved well-being when dietary carbohydrate is reduced.
Reducing dietary carbohydrates stabilizes blood sugar and reduces insulin output
Reducing carbohydrates can stabilize blood sugar levels and prevent the excessive output of insulin [10, 11, 12]. Stabilizing blood sugar and insulin levels by reducing carbohydrate intake can help address health concerns such as cardiovascular disease, Type 2 diabetes, and overweight and obesity. Protein causes only a small rise in blood sugar; fat does not cause any rise in blood sugar at all. Because protein and fat have a minor impact on blood sugar levels, they do not cause the body to produce excessive amounts of insulin.
Insulin becomes elevated as a direct response to dietary carbohydrate. The elevated insulin levels that accompany a high-carbohydrate diet could contribute to the development of diseases such as heart disease and Type 2 diabetes. Elevated insulin levels are an independent risk factor for cardiovascular disease, obesity, and diabetes and are one of the indicators of Metabolic Syndrome. [13, 14, ]. Insulin levels become elevated long before abnormal blood sugar readings are detected . Chronically increased output of insulin from the pancreas can lead to pancreatic “burn out,” when no more or very little insulin is produced and blood sugar levels are poorly controlled [15, 16]. At this point, a person is frequently diagnosed with Type 2 diabetes. Controlling carbohydrate intake will reduce insulin production and restore the body’s ability to burn stored body fat for energy.
Reducing dietary carbohydrate changes your lipid profile for the better
Reduction on dietary carbohydrate reliably lowers triglyceride levels and raises HDL (the “good” cholesterol). In many cases, a reduced-carbohydrate diet will also change the quality of LDL particles, increasing the ratio of large (will not “clog” the arteries) LDL to small (can “clog” the arteries) LDL. Both changes in the lipid profile represent a decreased risk of cardiovascular disease. [2, 17, 18, 19].
A reduced-carbohydrate diet provides the most appropriate nutrition for the body
In addition, a reduced-carbohydrate diet closely follows the body’s own requirements for appropriate nutrition. High quality protein, a crucial macronutrient, is supplied in sufficient quantities. Essential fatty acids obtained from the diet would also be a typical part of reduced-carbohydrate diet (although for those who do not care for fish, a supplement may be advisable). Fat-soluble vitamins A, D, E and K are acquired and metabolized much more effectively with a diet that encourages sufficient fat and protein consumption.
Adequate consumption of essential nutrients in protein and fat, plus reduction of unnecessary dietary carbohydrates, can have a positive aspect on many areas of health.
What chronic health conditions are improved by reducing dietary carbohydrate?
Reducing carbohydrates: weight loss and more
Reduced-carbohydrate diets have been studied primarily for their effectiveness in weight loss. In fact, research has shown reduced-carbohydrate diets to be effective for that purpose, although weight loss can be accomplished through many different approaches and may require an array of interventions, from diet to cognitive and behavioral modification. However, if weight gain or inability to lose weight is associated with a specific metabolic profile, such as Type 2 diabetes, Metabolic Syndrome, insulin resistance, hyperinsulinemia, or related conditions, the unique features of a reduced-carbohydrate diet can promote weight loss while correcting the underlying issues affecting overall health.
Blood sugar control, insulin resistance, and Type 2 diabetes
A reduced-carbohydrate diet is an especially effective way of improving health for those with blood sugar control issues or insulin resistance. Patients who have insulin resistance, Metabolic Syndrome, pre-diabetic conditions, or full-blown type 2 diabetes can all benefit from this treatment method. Since type 2 diabetes is a disease whose hallmark is high blood sugar levels, the key to controlling diabetes is maintaining blood sugar at normal levels. Type 2 diabetes is listed in a widely-used physician handbook (the Merck Manual) as a disorder of carbohydrate metabolism. Therefore it makes sense to treat type 2 diabetes by limiting unnecessary carbohydrate intake, just as you would treat any food allergy or sensitivity.
A person who is diagnosed with type 2 diabetes is likely to be given medication to reduce blood sugar levels. However, recent research has shown that even with drug therapy to control blood sugar levels, risk of diabetic complications and death are not significantly reduced, only delayed in onset. .
Medications such as insulin and other blood sugar-lowering medications cannot be synchronized as closely with the body’s needs as the body’s own processes. Common side effects of these medications are hunger, weight gain, and excessively low blood sugar levels . Blood sugar levels controlled by medication may stay elevated longer than they should, leading to nerve and kidney damage. In fact, in a recent research study that was halted early, attempts to control blood sugars tightly with medication led to increased adverse effects and death; other large trials show that intensive drug therapy does not reduce overall mortality or complications of diabetes related to heart disease. .
Controlling blood sugars by eliminated unnecessary dietary carbohydrate is a more natural and effective way of avoiding the complications of type 2 diabetes.
Because controlling carbohydrate intake and insulin levels also controls how fat is stored in the body, a reduced-carbohydrate diet can be effective in addressing abnormal lipid profiles, such as those seen with Metabolic Syndrome [8, 22, 23]. One of the markers of Metabolic Syndrome is elevated triglycerides and reduced HDL levels. Reduced-carbohydrate diets have consistently been shown to reverse this lipid profile and reduce triglycerides while increasing HDL . While there is an occasional rise in LDL levels on a reduced-carbohydrate diet, this is often a result of a temporary rise in blood lipids during weight loss or a result of the formula used to calculate LDL. LDL is seldom measured directly, and, mathematically, lower triglycerides levels result in higher LDL. It is also important to note that, in older adults, lower, rather than higher levels of serum cholesterol, may be associated with increased risk of CVD mortality [24, 25].
There is an increasing interest in the connection between oral bacteria and heart disease [26, 27]. Scientists have found that poor oral hygiene is associated with increased inflammation and thickening of the arterial walls. It has been well-established that the bacteria in our mouths flourish in the presence of dietary carbohydrates. Reducing dietary carbohydrate may have additional benefits beyond reducing dental caries; in fact, it may be a contributing factor in reducing heart disease.
Reducing carbohydrate intake can also lead to reductions in hypertension, considered to be a risk factor for heart disease. Although the mechanism by which this takes place is not fully understood, weight loss with a reduced-carbohydrate diet has been shown to have greater effects on reducing blood pressure than weight loss alone [28, 29].
Gluten and lactose intolerance
We are only now beginning to take into account the prevalence of intolerance to gluten (a wheat protein) and lactose (a type of sugar) intolerance in the American population. Many symptoms of these two conditions are vague, non-specific, and may be generally attributed to environmental factors and remain undiagnosed indefinitely. As a reduction in gluten and lactose naturally accompanies a reduced-carbohydrate diet, some people may experience a relief from gastrointestinal and allergic symptoms that they have been suffering from for years. Of course, a clinical diagnosis of gluten and/or lactose intolerance is easily addressed through a reduced-carbohydrate type of diet. Because some forms of schizophrenia have been associated with gluten intolerance and some patients with schizophrenia have shown improvement on a reduced-carbohydrate diet, reduced-carbohydrate diet therapy may be considered in conjunction with other medications used to treat that condition .
Other conditions that respond to a reduction in dietary carbohydrates
Other conditions that have been shown through clinical trials to respond to a reduced-carbohydrate diet are gastroesophogeal reflux disorder (GERD) [31, 32] and polycystic ovary syndrome (PCOS) . Both of these conditions improve due to the unique features of a reduced-carbohydrate diet.
Calorie-restriction through carbohydrate restriction: the key to a long and healthy life
The only scientifically-supported method for increasing longevity that has been studied is calorie-restriction, proven to be effective in mice, dogs, and monkey . Animals on calorie-restricted diets not only live longer, they live healthier lives, demonstrating a reduction in age-related diseases, including cancer. While much research remains to be done in this field, scientists have found a common feature in all animals displaying increased lifespan: insulin sensitivity [35, 36]. Calorie-reduction and increased sensitivity are also the primary features of a reduced-carbohydrate diet as well. Reducing dietary carbohydrate effectively lowers the body’s insulin output, helping the body to maintain insulin sensitivity. At the same time, reducing carbohydrate can also help lower overall calorie consumption.
Studies that have investigated the effectiveness of reducing or eliminated carbohydrate as a weight loss technique have frequently found that reduced-carbohydrate dieters limit calories despite a slight increase in fat intake—all on their own! Even though these dieters are allowed to eat an unrestricted amount of certain foods, they usually eat fewer calories than their counter-parts in the calorie-restricted groups being studied. Scientists know that dietary protein and fat, the primary components of a reduced-carbohydrate diet, are also powerful appetite suppressants. In addition, the blood sugar control and appetite regulation afforded by a reduced-carbohydrate diet may reduce the desire for between-meal snacking and the opportunities it presents for over-consumption of calories. Stable blood sugars and increased awareness of the body’s signals for true hunger and fullness may help regulate intake without the need for restrictive eating behaviors.
Why don’t all experts recommend reducing dietary carbohydrates?
Although we like to think that science and health are fields exempt from political motivations and influences, unfortunately this is not the case. The case for a reduced-fat, high-carbohydrate diet was promoted by a few influential researchers over thirty years ago with little data to support it . The US government created guidelines that followed these recommendations and many doctors have passed this advice along to their patients. However, this type of diet has never been shown to be effective in reducing the incidence of heart disease, diabetes, or overweight and obesity in our population; the 2010 Dietary Guidelines for Americans states that its recommendations “have not been specifically tested for health benefits .”
Scientists have been questioning the benefits of our national dietary recommendations since they were first created in 1980. This concern has not abated in thirty years. In 2000, scientists who review the evidence for creating the Dietary Guidelines for Americans questioned the effect that low-fat diet recommendations have had on the health of Americans, noting that “an increasing prevalence of obesity in the United States has corresponded roughly with an absolute increase in carbohydrate consumption” and that “Consumption of high-carbohydrate diets also can produce an enhanced [post-meal] response in glucose and insulin concentrations . . . [which] could predispose to type 2 diabetes mellitus” . Many scientists have pointed to evidence that, in some cases, a high-carbohydrate, low-fat diet may actually increase the risk of chronic disease. In her review of recent scientific evidence, Dr. Janet King, Chairwoman of the 2005 Dietary Guidelines Advisory Committee, cited specifically that “evidence has begun to accumulate suggesting that a lower intake of carbohydrate may be better for cardiovascular health” . A report by the Institute of Medicine’s Food and Nutrition Board issued in 2005 indicates that “Compared to higher fat diets, low fat, high carbohydrate diets may modify the metabolic profile in ways that are considered to be unfavorable with respect to chronic diseases such as coronary heart disease (CHD) and diabetes” . According to Dr. Frank Hu, Professor of Nutrition and Epidemiology at the Harvard School of Public Health, “The country’s big low-fat message backfired. The overemphasis on reducing fat caused the consumption of carbohydrates and sugar in our diets to soar. That shift may be linked to the biggest health problems in America today” .
Nevertheless, the United States Department of Agriculture and the Department of Health and Human Services have continued to create dietary recommendations that insist that “Healthy diets are high in carbohydrates” . These two powerful governmental agencies are charged with protecting the health of Americans while, at the same time, promoting the interests of the American food and drug industries. These two responsibilities may often be in direct conflict, and frequently it is the American consumer that loses.
The top three agricultural products in America are wheat, corn, and soy, the primary ingredients in high-carbohydrate, nutritionally-empty processed foods, from cereal to frozen entrees to fast foods . These foods can be very appealing to consumers despite their lack of nutritional content. A diet based on these foods may result in chronic illnesses for which a prescription drug is a more convenient remedy than a change in diet and lifestyle. Unfortunately, what is bad for the consumer is good for the food and drug industries. There is little incentive from either the government or from industry to assist the consumer in making better choices.
Some concerns about reduced-carbohydrate diets
Although mankind subsisted for thousands of years on diets relatively low in the grains and cereals that now make up a large portion of the calories that Americans consume, many misunderstandings and myths surround this approach to healthy eating. According to the Institute of Medicine, “The lower limit of dietary carbohydrate compatible with life is apparently zero” . No nutritional deficiencies or metabolic disorders are associated with limited carbohydrate intake as long as protein and essential fats are consumed in enough quantities to provide sufficient energy.
Myth: The large quantities of protein consumed on a reduced-carbohydrate diet can cause osteoporosis, kidney damage, and heart disease.
This is a persistent myth that is wrong on two counts. First of all, a reduced-carbohydrate diet does not mean a high-protein diet! Studies comparing low-fat and reduced-carbohydrate diets demonstrate only a slight increase in protein consumption for reduced-carbohydrate dieters, well within the 10 -35% of calories recommended by the Institute of Medicine, despite unlimited allowance of protein foods on the diet .
Protein consumption does not lead to osteoporosis. In fact, poor protein intake can contribute to bone loss . There is no evidence indicating that protein intakes at the levels consumed on a reduced-carbohydrate diet lead to kidney disease [44, 45, 46, 47, 48]. In fact, low protein intake can lead to decreased renal function. Finally, protein intake is not correlated with heart disease risk. The Nurses’ Health Study actually demonstrated an inverse relationship between protein intake and risk of cardiovascular disease . One of the risk factors for heart disease is obesity. Experts acknowledge that replacing dietary carbohydrate with protein improves weight loss, which in turn can reduce risk of heart disease .
Myth: Diets high in fat and cholesterol increase the risk of obesity, certain types of cancer, and heart disease.
Fat and cholesterol play essential roles in our metabolism. Dietary fat is necessary for the absorption of fat-soluble vitamins (A, D, E, and K). Fat functions in cell-signaling, gene expression, and may play a role in regulating inflammation, insulin action, and neurological function. Fat provides essential fatty acids your body can’t make on its own. Cholesterol is an important of part of every cell membrane and is a precursor to hormones such as estrogen and testosterone.
There is no direct link between total dietary fat and cardiovascular disease, obesity, and cancer [40, 50 ]. There is no conclusive data relating cholesterol intake to cardiovascular disease and coronary heart disease endpoints [51, 52, 53]. The past research that seems to demonstrate negative health effects of fat consumption has been confounded by the fact that this research has been done with diets that are high in both fat and carbohydrate. We now know that dietary carbohydrate has a tremendous effect on how other nutrients are metabolized, especially dietary fat. When high-fat diets are studied without high carbohydrate, these negative health effects are not shown. In fact, research has shown that high-fat, reduced-carbohydrate diets can improve weight loss, blood sugar control, insulin resistance, and risk factors for heart disease, along with indicators of inflammation that scientists believe is its underlying cause.
The diet that is healthiest is the diet that is healthiest for you.
Choosing to reduce carbohydrate intake can be a healthy approach to a lifetime of wonderful eating, but although the body does not need extra carbohydrates added to the diet to be healthy, carbohydrates do not need to be excluded entirely. There is no one-size-fits-all diet that can guarantee good health for everyone. This information and a trusted healthcare provider can help you choose the foods that are right for you.
This information was brought to you by Healthy Nation Coalition, a non-profit organization dedicated to promoting nutritional literacy and individualized nutrition in the context of open, transparent, and sustainable food-health systems. We do not accept government or industry funding. Help us create thoughtful progress towards a healthier future. For more information, contact:
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