It seems everyone these days is worried about carbs. People worry that eating them will lead to weight gain, or that they are simply unhealthy and must be avoided. But is this concern justified? Or is our carb-aversion actually hurting our health?
HOW CARBS BECAME A DIETARY SUPERVILLAIN
It seems everyone these days is worried about carbs. But is this concern justified?
It Our culture is certainly not immune from nutritional confusion. For example, it’s a popular (but incorrect) belief that dairy is needed for bone health, despite the fact it’s most certainly not, and hasn’t even been part of our species’ diet for most of human history.[1 – 5]
With regard to carbs, people worry that eating them will lead to weight gain, or that they are simply unhealthy and must be avoided. Is that right, or is it another example of a popularly held but inaccurate idea?
CARBS: A BRIEF HISTORY
Some hundreds of millions of years ago, plants developed the ability to take energy from the sun (along with carbon dioxide and water) and make carbohydrates. The process, called photosynthesis, allowed plants to store energy in the form of carbohydrates. 
This evolutionary step completely transformed the planet because it allowed the flourishing of organisms that lacked the ability for photosynthesis, since they were now able to obtain energy by eating carbohydrates in plants.
The human body, which does not have the ability to make food from the sun, also happens to use carbohydrates as its main energy source. For example, our brain and red blood cells depend specifically on glucose (a carbohydrate) for normal functioning and energy.[7 – 9]
Carbs also serve as an important energy reserve in the form of glycogen in our muscles and liver, allowing us to maintain steady energy levels and also to have energy for sudden strenuous activities (such as sprinting).[9 – 10] Thus, carbohydrates enable the body to adapt to a diverse range of situations.
How, then, did we come to vilify carbs? Most plant foods are naturally high in carbohydrates, so, if we shun carbs, we’re shunning some of the healthiest foods that exist. We’re also shunning our bodies’ main source of energy. So how did this all come about?
THROWING THE BABY OUT WITH THE BATH WATER
There’s a world of difference between eating fruits, vegetables and whole grains, versus eating doughnuts, candy and other processed foods.
In this vein, there’s a kernel of truth in the low-carb message: Refined sugars, white bread and other processed foods high in carbs are unhealthy. Indeed, they are. But it’s not because they are high in carbs; it’s because they are processed foods that have had all of their nutrients stripped out.
However, fruits and other plant foods that are naturally high in carbs (such as vegetables, whole grains, and legumes) contain fiber, phytonutrients, antioxidants, minerals, and vitamins, which are critical for good health—from protecting our eyesight by helping prevent macular degeneration,[11 – 14] to helping fight infections and cancer.[15 – 16] Yet these immensely healthy foods have been grouped in the minds of many with white bread and table sugar.
By telling people to avoid or significantly limit carbs in general, the low-carb movement has erased the crucial distinction between unprocessed and processed foods—creating an entirely new paradigm that goes against everything we know about nutrition and health.
LONG-TERM VS. SHORT-TERM
If you eliminate carbohydrates from your diet and put your body into a state of ketosis, whereby it’s forced to burn fat to make ketones for energy, it can lead to short-term weight loss. But keeping your body in a state of ketosis is neither sustainable nor healthful, and it does not fulfill the long-term promise of effective weight loss.[17 – 19] Indeed, observational population studies show that high-protein, high-fat diets are associated not only with more health problems but also obesity.[20 – 21]
When looking at long-term and sustained weight loss without mandated exercise or calorie restriction, the most effective eating pattern has been shown to be whole-food, plant-based diet (low in fat and high in unprocessed carbohydrates).
THE RISE OF ATKINS
The low-carb idea first became well known in 1972 after Robert Atkins began publishing his Diet Revolution books,[23 – 24] which sold more than 15 million copies and established the Atkins brand marketing empire.
Atkins is considered the “father” of the low-carb movement. He pushed the remarkable idea that if people ate fat and protein and eliminated (or significantly minimized) carbs, they would be more slender and healthy.24-25 Calories were deemed unimportant, allowing people to embrace some of the unhealthiest foods, while still following a “diet.”[24 – 25]
It’s not hard to see the appeal of this movement, which persists to this day. Gluttony is permitted and encouraged, and people think they are sticking to a diet while loading up on fried chicken, butter, bacon, eggs, steak, and cheese.
The chair of Harvard’s Department of Nutrition said the Atkins diet was “nonsense” and “dangerous.” The prestigious Medical Letter on Drugs and Therapeutics called the diet “unbalanced, unsound, and unsafe.” But no amount of criticism stopped the diet’s popularity and the newfound fear of carbs it perpetuated.
THE ZONE DIET AND OTHER ATKINS SPIN-OFFS
Seeing how Atkins hit the financial jackpot, it didn’t take long for a slew of other “low-carb” spin-offs to follow suit.
In the 1990s, we saw the rise of the Zone diet, which claimed to achieve both weight loss and “hormonal balance” with a so-called “40-30-30” approach, whereby you obtain a relatively low 40 percent of calories from carbs (so still low-carb), 30 percent from protein, 30 percent from fat. The Protein Power diet was a high-protein/low-carb approach, with significant vitamin and mineral supplementation (perhaps to compensate for the deficiencies of avoiding high-carb fruits and vegetables).
The blood type diet was an even more unusual idea, where people with different blood types would follow dramatically different diets (which is akin to someone recommending different diets based on different eye or hair colors—sounds curious enough, but has no real science behind it). Interestingly, it recommended a meat-free diet for those with blood type A but a meat-heavy low-carb diet for those with blood type O, which is the most common blood type in the U.S.
The 2000s produced even more low-carb variations. The South Beach Diet emphasized “leaner” meats, but still limited carbs to no more than 28 percent of daily calories. The Paleo diet, popularized by an exercise physiologist, is another “high-protein/high-fat/low-carb” diet, but with an emphasis on avoiding processed foods and dairy. It’s based on very subjective assumptions about hunter-gatherer life in Paleolithic times, with provocative and sweeping claims that animal foods comprised up to 75 percent of the human diet (despite evidence to the contrary),[37 – 39] and that these questionable estimates are what we should be eating today despite being at odds with mainstream medicine).[16, 40 – 44]
These diets and their promoters have enjoyed immense commercial success. The author of The South Beach Diet, for example, has sold more than 17 million books and generated large revenues from online services and major licensing deals. The founder of the Paleo diet gained a huge share of the weight-loss market, including cookbooks, paleo-themed magazines, “paleo-approved” protein bars and other products.
These low-carb entrepreneurs tapped into something very powerful: people’s desperation to lose weight. But they have done so by introducing serious confusion about basic nutrition, to the detriment of people’s health.
THE REAL SKINNY ON WEIGHT LOSS
In short, low-carb/high-fat diets are not good strategies for sustainable or healthy weight management.
One reason is that it’s metabolically a lot easier for our bodies to use carbs for energy, and to store fat as fat.[7, 47] Certainly, if you’re eating too many calories in general, then carbs can and do get metabolized into fat. But it costs our bodies a large percentage of calories to do so: About 28 percent of energy content of carbs is needed to convert them into fat.
In addition, it’s much harder to overeat whole plant foods that are naturally high in carbohydrates (such as fruits and vegetables) because they are typically less calorically dense than high-fat foods but come packaged with lots of fiber that provides satiety (i.e., you feel full before you eat too much).[48 – 49] By contrast, high-fat/low-carb foods can easily trick our brains into overeating because they are more calorically dense and lack fiber.[48 – 49]
A LESSON FROM HISTORY?
Low-carb advocates sometimes claim that we’ve tried limiting fat before and it didn’t work—that it actually made Americans fatter. Specifically, they point to a U.S. Senate report published in 1977 that recommended increasing plant foods while cutting back on high-fat meat and dairy.
But the basis for this argument is simply not true.
First of all, the 1977 recommendations specified that no more than 30 percent of calories should come from fat—which is not “low-fat” by any measure. Second, even that modest recommendation was not followed (not even close); instead, fat and calorie consumption continued to increase.[51 – 53]
A BETTER LESSON FROM HISTORY
It’s no big surprise that Americans are not the healthiest population: We weren’t in the 1970s and we still aren’t today. So, who are the healthiest populations and how do they eat?
The healthiest population in the world have thrived on carbohydrate-centric diets with corn, wheat, rice, or barley as the main staple, plus lots of vegetables and fruits. These populations are sometimes referred to as “Blue Zones.”
One example is the Okinawans of Japan. Their traditional diet derived close to 85 percent of calories from carbohydrates, with about 60 percent of calories specifically coming from sweet potatoes.
This emphasis on whole unprocessed foods high in carbs served the Okinawans very well. They were not obese, had much lower rates of diseases that plague the West, and were the longest living people on the planet until they changed their diets. Older Okinawans who continue their traditional way of eating are still among the oldest living people on the planet.
INCREASED CARDIOVASCULAR RISK
Those who follow a low-carb diet have been found to be 50 percent more likely to die of cardiovascular disease and 51 percent more likely to die from cerebrovascular disease.[57 – 58]
Cardiovascular disease involves the hardening of the arteries and formation of cholesterol plaques in our vessels, which can cause blockages, blood clots, or tears in our vessels. The manifestations of this disease can occur in the heart, as it often does, or in the brain where it causes strokes (or in other parts of the body). It’s the world’s leading cause of death, and the only diet that’s been found to stop and reverse it is a whole-food, plant-based vegan diet.[59 – 60]
There are numerous factors that help explain the strong association between animal food consumption and cardiovascular risk. For example, eating animal foods in general (including poultry, eggs, dairy, and fish) results in our bodies producing higher amounts of a substance called trimethylamine N-oxide (TMAO).[43, 61] TMAO directly injures the lining of our blood vessels and makes them prone to develop atherosclerosis.[43, 61]
That may be why cardiologist Dr. Kim Williams vigorously promoted a plant-based vegan diet during his tenure as president of the American College of Cardiology,[62 – 63] and once famously said, “There are two kinds of cardiologists, those who are vegan and those who have not read the evidence.”
Dr. Robert Atkins himself sadly had a history of congestive heart failure and a heart attack, according to his medical report that was accidentally leaked from the New York medical examiner’s office following his death. His widow and the Atkins organization have always denied it, understandably, as it’s a tragic stain on a brand that advocates for animal food gluttony.
It’s worth noting that those following a low-carb diet were also found to be 35% more likely to die of cancer.[57 – 58]
It is extremely important to eat a varied and large amount of whole plant foods every day, something that is exceedingly difficult (if not impossible) to do if you’re displacing plant foods with animal foods in a misplaced effort to avoid carbs.
Yes, refined and processed foods (including processed carbs) are to be avoided. But don’t replace them with meat, eggs, and cheese. Replace them with foods that actually promote good health, such as vegetables, fruits, legumes, whole grains, and, yes (gasp!), potatoes, sweet potatoes, and bananas, too.
It’s easy to get the right proportions of nutrients (plus lots of antioxidants and phytonutrients that promote health and prevent disease) simply by eating a well-balanced and varied diet of whole plant foods. And, as no small added benefit, eating a plant-based vegan diet is also an effective and sustainable way to manage your weight.
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The accompanying video was written and narrated by Sofia Pineda Ochoa, MD and edited by Bob Rapfogel.
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- Photographs and illustrations of (1) cover image of potatoes by Scott Bauer, USDA ARS, released into public domain by the Agricultural Research Service, the research agency of the United States Department of Agriculture, with the ID K9152-1; (2) low carb diet banner from Diet Calculators; (3) Got Milk advertisement featuring actors from Scrubs; (4) babies drinking from cow from Collective Evolution; (5) breads, vegetables in boxes, berries, salad, grains, donuts, candy, cupcakes, sugar cubes, white bread, cinnamon bun, legumes, oats, woman’s eye, meat on grill, veggies and rice, weight loss belly, meats , fried chicken, bacon wrap, chicken with cheese, calorie counter sandwich, woman on scale, corn, belly and hand, beetroot, vegetable tomatoes, clementine, purple cauliflower, whole roasted chicken, fried egg, raw bacon, wheat, rice, barley, whole potatoes, Danish butter cookies, Hostess Cupcake, colorful candy, oatmeal, vegetable dish, fruit cups, chickpea salad, whole grain wild rice, potatoes, sweet potatoes, bananas from Pixabay under CC0 Creative Commons license; (6) fruits and vegetables in grocery under CC0 Public Domain; (7) Gregory’s Steakhouse steak eating contest via Flickr; (8) calories sign by Nick Youngson CC BY-SA 3.0 Alpha Stock Images under Creative Commons; (9) elderly Okinawans from Blue Zones website, “Okinawa’s Longevity Lessons”; and (10) white rice bowl by George Reyes vua Attribution 2.0 Generic license.
- Video of Robert C. Atkins debate from Professor Debunks Atkins/Keto Diet from Plant Based News.