Could there possibly be a more controversial topic than how many carbs we should be eating?! One of the perks of following a Paleo framework is that when we maximize nutrient density (see The Importance of Nutrient Density) and eat high-quality foods from both the plant and animal kingdom, other elements of diet, like macronutrient ratios, tend to fall into place without us needing to obsessively count fat or carb grams. Still, considering how much bad press carbohydrates tend to get (as well as the tendency for the media—and even some leaders within the Paleo movement itself—to mis-portray Paleo as being low carb), a great deal of confusion exists surrounding optimal carb intake. What’s the scoop?
The short answer is… it depends! It depends on what our goals are, how far away we are from those goals, how active our lifestyles are, how well we sleep, how well-managed our stress is, and what health issues we might be dealing with. All of these factors can influence the healthiest level of carbs for our specific situation.
But, while there’s no one-size-fits-all recommendation we can all safely shoot for, we can definitely pull together some guidelines based on available evidence.
What is a Carbohydrate?
Carbohydrates are a class of organic molecules, made up of sugar molecules, or saccharides, as the basic structural components. Carbohydrates are relatively simple molecules composed of carbon atoms, oxygen atoms and hydrogen atoms (including hydroxyl groups, one oxygen and one hydrogen bound together), and a general formula of Cm(H2O)n , for example sucrose has the molecular formula C12H22O11. The most important and prevalent carbohydrate is glucose, the primary metabolic fuel for the human body and indeed most forms of life on Earth. For more on ATP production and the Krebs cycle, see Why Is Sugar Bad?
Chemically, carbohydrates are classified based on the number of saccharides they contain: monosaccharides are made up of a single sugar molecule (examples are glucose and fructose), disaccharides contain two sugar molecules (examples are sucrose and lactose), oligosaccharides are medium-length chains of three to ten sugar molecules, and polysaccharides are long chains of sugar molecules that can be hundreds long (think of polysaccharides of long chains of monosaccharide units therefore they can be broken down in our digestive system into simple sugar molecules). From a dietary perspective however, it’s more relevant to classify carbohydrates based on how they’re digested and absorbed:
- Sugars, also called simple carbohydrates or simple sugars, include monosaccharides like glucose, fructose and galactose, and disaccharides like sucrose (one fructose and one glucose), lactose (one glucose and one galactose) and maltose (two glucoses). Sugars give food a sweet taste and are naturally found in fruit, dairy products and natural sweeteners like honey. They are digested and absorbed quickly and the glucose they contain has a rapid impact on blood sugar levels and insulin secretion. (Note that the presence of fiber in whole fruit helps to slow down the digestion of the sugars in fruit, see Why Fruit is a Good Source of Carbohydrates).
- Starches are complex carbohydrates, polysaccharides composed predominantly of glucose. Starch is produced by most plants as an energy storage molecule and is commonly found in grains, legumes, and root vegetables such as potatoes, sweet potatoes, and cassava. Starch takes longer to break down during digestion and has a more gradual impact on blood sugar levels. See also What is a Safe Starch?
- Fiber is also a complex carbohydrate, oligosaccharides and polysaccharides that don’t get fully broken down by our digestive enzymes and instead are fermented by the bacteria and other microorganisms that live in our digestive tracts. Fiber is discussed in detail starting in The Fiber Manifesto-Part 1 of 5: What Is Fiber and Why Is it Good?, The Fiber Manifesto-Part 2 of 5: The Many Types of Fiber, The Fiber Manifesto-Part 3 of 5: Soluble vs. Insoluble Fiber, and 5 Reasons to Eat More Fiber
Whole-food carbohydrates, like fruits and vegetables, contain a mix of simple and complex carbohydrates, including fiber which slows own digestion and blunts the blood sugar response. Blood sugar regulation is further improved by ingesting fruits and vegetables as part of a complete meal that also includes protein and fats.
Refined carbohydrates refer to carbohydrates that have been processed. For example, when the bran and germ are milled away from whole grains to make refined grain products, most of the fiber is removed. The resultant starches are digested and absorbed rapidly, sometimes raising blood glucose levels as quickly as simple sugars. Examples are white flour made from whole wheat, white rice made from brown rice, table sugar made from whole sugar cane or sugar beets. Of course, whole grain foods are omitted on a Paleo diet due to being relatively empty calories and containing compounds that negatively impact gut health (both gut barrier and microbiome) and stimulate the immune system (causing inflammation). For more, see What Is The Paleo Diet?, Gluten-Free Diets Can Be Healthy for Kids , Gluten Cross-Reactivity: How your body can still think you’re eating gluten even after giving it up., Are all lectins bad? (and what are lectins, anyway?), Why Grains Are Bad-Part 1, Lectins and the Gut, What Is A Leaky Gut? (And How Can It Cause So Many Health Issues?), How Do Grains, Legumes and Dairy Cause a Leaky Gut? Part 2: Saponins and Protease Inhibitors, and What is a “Safe Starch”?
Simple sugars can also be refined. A prominent example of a processed sugar is high fructose corn syrup. In this case, corn syrup is treated with enzymes to turn a proportion of the syrup’s glucose into fructose. High fructose corn syrup is discussed further in Why is High Fructose Corn Syrup Bad For Us? , Is Fructose a Key Player in the Rise of Chronic Health Problems? and Fructose and Vitamin D Deficiency: The Perfect Storm?.
When we consume carbohydrates, they are broken down into simple sugars (mostly glucose) by our digestive enzymes and absorbed into our blood stream. This causes a rise in blood glucose levels, which stimulates the release of insulin and it’s this system (and what happens when things go wrong) that is what all the hubbub is about.
Carbohydrates Stimulate Insulin Release
When we consume carbohydrates, our digestive system first breaks complex carbohydrates down into monosaccharides (mainly glucose molecules), which are absorbed into our blood stream, causing a resulting rise in our blood sugar levels, (aka blood glucose levels). In response to that rise in blood sugar, the pancreas releases the hormone insulin, which facilitates the transport of glucose into the cells of the body and signals to the liver to convert glucose into glycogen for short-term energy storage in liver and muscle tissues and into triglycerides for long-term energy storage in adipose tissues. Once inside our cells, glucose in an energy source, being rapidly converted into ATP, the energy currency for all cells, via the Kreb’s cycle (a process that also uses oxygen and produces carbon dioxide, also called the Citric Acid Cycle or Cellular Respiration, explained in Why Is Sugar Bad?).
It’s a beautifully efficient system… until things go wrong. Chronically elevated blood sugar levels stimulate adaptations within cells, rendering them less sensitive to insulin. These adaptations may include decreasing the number of insulin receptors embedded within cell membranes and suppressing the signaling within cells that occurs after insulin binds to its receptor. This causes the pancreas to secrete even more insulin to lower the elevated blood glucose levels. This is called insulin resistance or loss of insulin sensitivity, when more insulin than normal is required to deal with blood glucose. When normal blood sugar levels can no longer be maintained, you get type 2 diabetes. See The Hormones of Fat: Leptin and Insulin , The Hormones of Hunger and Why Is Sugar Bad?
Insulin resistance is bad. It promotes weight gain and increases risk not only of obesity and diabetes, but also cardiovascular disease, many forms of cancer, asthma, allergies, PCOS, chronic kidney disease, many autoimmune diseases…. the list goes on.
So, if chronically elevated blood sugar levels makes you insulin resistant leading to health problems, then the key must be to not eat all those carbs, right? This thinking is what led to the now-debunked carbohydrate-insulin hypothesis of obesity and a surge in popularity of low-carb diets since the early 1990s. See New Scientific Study: Calories Matter
Low-carb diets do promote weight loss (and achieving a healthy weight reduces risk of diabetes, cardiovascular disease, etc.). This fact has led to their increased popularity and the push towards ever lower carbohydrate intake, including the current ketogenic diet fad. However, rigorous and well-controlled metabolic ward studies have confirmed that low-carb and ketogenic diets don’t turn us into “fat-burning machines” with increased energy expenditure and preferential fat mass loss (see New Scientific Study: Calories Matter). These diets help us lose weight simply by creating a dietary structure that focuses on more satiating foods so that most individuals naturally achieve a caloric deficit (the Paleo diet which embraces whole foods sources of carbohydrates also results in weight loss by focusing on more filling foods, while also supporting high veggie intake and nutrient sufficiency, see The Importance of Vegetables and The Importance of Nutrient Density. While weight loss is certainly more complicated than calories in versus calories out, a caloric deficit is still a necessary condition for weight loss. See Paleo for Weight Loss and Portion Control: The Weight Loss Magic Bullet
The fact is that insulin plays a lot of important roles in human health independent of its role in energy balance. So, while insulin resistance is clearly damaging, not eating enough carbs to secrete much insulin can also cause health challenges. See The Case for More Carbs: Insulin’s Non-Metabolic Roles in the Human Body
It’s also true that insulin sensitivity (meaning that the body is sensitive to insulin signaling and blood sugar levels are well managed) is not simply determined by the amount and types of carbs we consume. Insulin resistance is caused by lack of physical activity (prolonged sedentary periods), inadequate sleep and high stress (see 3 Ways to Regulate Insulin that Have Nothing to Do With Food).
Determining Optimal Carbohydrate Intake
Macronutrients are the nutrients we need in big (“macro”) quantities: fat, protein, and carbohydrate (in contrast to micronutrients like vitamins and minerals that are even more vital for health, but which we need in smaller quantities). Defining an optimal dietary macronutrient ratio—what percentage of our calories should come from carbs versus fat versus protein—is a contentious issue in the nutrition world, and the debate often bleeds over into the Paleo community as well. In fact, there’s a tendency for the media to misportray Paleo as being a low- or zero-carbohydrate diet, a high-fat diet, and/or a high-protein diet. In reality, the Paleo diet is a micronutrients first approach to nutrition with overall relatively balanced macronutrient ratios and lots of wiggle room to self-experiment. But, where do we start?
There’s a few different ways to come as this question: looking at the carbohydrate intake of hunter-gatherers, calculating the minimum carbohydrate requirement for sufficiency of nutrients that we primary obtain from vegetables and fruit (see The Diet We’re Meant to Eat, Part 3: How Much Meat versus Veggies?), and looking at intake levels that are correlated with higher disease risk. No matter how you slice it, the conclusion is the same: moderate carbohydrate consumption (of whole food sources of carbohydrates like root vegetables and fruit) is superior to either low-carb or high-carb approaches.
What constitutes moderate carbohydrate consumption? I’m so glad you asked…
Hunter-Gatherer Carb Intakes
As we dive into understanding how many carbohydrates we should be eating as part of an optimal human diet, let’s start with hunter-gatherers! While the Paleo diet is far from historical re-enactment, we can still glean clues for an optimal human diet based on these societies virtually free from the chronic diseases that plague Western countries.
According to Loren Cordain’s 2000 publication, “Plant-animal subsistence ratios and macronutrient energy estimations in worldwide hunter-gatherer diets” (which analyzed ethnographic data for 229 hunter-gatherer societies), the majority of hunter-gatherer populations ate between 22 and 40% of their diets as carbohydrates. That translates to 110 to 200 grams of carbohydrates per day on a 2000-calorie diet. There were a handful of societies falling outside that range, such as the lower-carb Inuit (3% calories as carbs, although they do have some potential additional sources not counted in this estimate like glycogen stores in whale blubber) and some groups eating as high as 50% carbohydrates, but those were by far the exception rather than the rule. In general, hunter-gatherers living close to the equator had higher carbohydrate (and total plant food) intakes than populations living closer to polar regions, and virtually every group residing between 11 and 40 degrees north or south of the equator (equivalent to the range between the northern part of Colombia and New York City) ate between 30 to 35% carbohydrates as a percent of total calories. On a 2000-calorie diet, that comes out to 150 to 175 grams per day. (See “Carbs Vs. Protein Vs. Fat: Insight from Hunter-Gatherers” for more on macronutrient ratios in hunter-gatherer societies. See also The Diet We’re Meant to Eat, Part 1: Evolution & Hunter-Gatherers, The Diet We’re Meant to Eat, Part 2: Physiological & Biological Evidence, and The Diet We’re Meant to Eat, Part 3: How Much Meat versus Veggies?)
Some critics of the data (such as Katharine Milton) have pointed out that these carb levels could also be underestimated, due to a tendency for ethnographers to interact more with male hunters than female gatherers and consequently under-document the contribution of gathered plant foods. But, we can say with confidence that most hunter-gatherer groups eat about a third of their diet as carbohydrates, give or take!
Eating Carbohydrates to Get Enough Fiber
Another way to frame the carbohydrate issue is to look at the bare minimum intake we’d need to get adequate daily fiber. (For a way more detailed rundown on why fiber is awesome, and why we need plenty of it in our diet, check out The Fiber Manifesto Part 1, Part 2, Part 3, Part 4, and Part 5, as well as Resistant Starch: It’s Not All Sunshine and Roses.) In short, fiber (especially antioxidant rich vegetable fiber) is critical for supporting gut health, promoting normal bowel movements, creating a healthy and diverse gut microbiome, protecting against many gut pathologies, regulating blood sugar, reducing inflammation, reducing the risk of certain cancers, and potentially even reducing the risk of heart disease and diabetes. It’s definitely not a nutrient we want to skimp on!
Current mainstream fiber recommendations are 25 grams per day for women and 30 to 38 grams per day for men. This is definitely less than what most Paleolithic and modern hunter-gatherers consumed (Boyd Eaton and Melvin Konner estimate 45.7 grams per day for a typical hunter-gatherer diet of 65% plant foods and Dr. Jeff Leach estimates that some hunter-gatherers eat as much as 200g of fiber per day), but we’ll use these numbers for the sake of illustration. Simple math shows that in order to meet current USDA fiber recommendations (25 to 38 grams per day), we need to eat a bare minimum of 50 to 76 grams of total carbohydrate. If we look at non-starchy vegetables with the highest ratio of fiber to non-fiber carbohydrates, we see that spinach comes out near the top, with roughly half of its carbohydrates coming from fiber. In order to get 25 grams of fiber per day from spinach, our minimum carbohydrate intake would be 50 grams. (And for the record, using spinach, we’d need to eat about 45 cups of it (almost 3 pounds) to reach that level. That’s pretty ambitious, even for those of us who love veggies!)
Using this logic, carbohydrate intakes of less than 50 grams per day are almost guaranteed to shortchange us on fiber. And that’s assuming we eat nothing but the highest-fiber carbohydrate sources out there! When our diet includes starchier or more sugary carbohydrate sources like tubers and fruit, which have a lower ratio of fiber to non-fiber carbs (while also being denser fiber sources), the minimum total carbohydrates we need to eat to meet our fiber needs rises even higher. For example, you’d only need about 3.5 cups of baked sweet potato to get your 25 grams of fiber, but then of course, you’re looking at nearly 150 grams of total carbs.
Provided that your carbohydrates are coming from whole fruits and vegetables, the 100-200 gram range is probably adequate from a fiber consumption standpoint (see also Why Fruit is a Good Source of Carbohydrates and What is a “Safe Starch”?. Of course, if we’re keen to emulate hunter-gatherer fiber intake, it would be incredibly challenging to do so without total carbohydrate intake creeping up towards 300 grams or more!
Another consideration with optimizing carbohydrate intake is ensuring we avoid the effects of eating too much or too little of each macronutrient (not just carbohydrates, but also fat and protein). On one hand, an extremely high carbohydrate intake (more than 70% of calories) leaves less room for fat and protein in our diet, which creates its own set of problems. Inadequate fat can decrease our absorption of vitamins A, D, E, and K (which ultimately affect every system in our bodies), as well as deprive us of essential fatty acids (omega-3 and omega-6). Inadequate protein can reduce the preservation of lean muscle tissue, reduce our immune function, negatively affect our bone mineral density, and cause a host of other problems related to insufficient intakes of essential amino acids. See The Diet We’re Meant to Eat, Part 3: How Much Meat versus Veggies?
On the other hand, too little carbohydrate (with lots of protein and fat) could mean an insufficiency of not only fiber, but also of certain nutrients and phytochemicals found most abundantly in carbohydrate-rich foods (including vitamin C, polyphenols, chlorophyll, carotenoids, isothiocyanates, and organosulfur compounds, all of which play various roles in disease prevention). (See “The Amazing World of Plant Phytochemicals” for more on why plant foods rock!) Also, read Saturated Fat: Healthful, Harmful, or Somewhere In Between? The solution? We can balance our macronutrients by eating moderate amounts of carbohydrate, fat, and protein, rather than excessive or extremely limited levels of any single one. Returning to hunter-gatherers for a minute, Cordain’s analysis found that most populations consumed between 19 and 35% protein and 28 and 58% fat. Eating about a third of our diet as carbohydrates (about a third as protein and about a third as fat) fits in nicely with the patterns we’ve observed among healthy hunter-gatherers, and seems to be the sweet spot for optimizing vitamin, mineral, phytonutrient, fiber, essential amino acid, and essential fatty acid intake!
Additional science supports the idea that balanced macronutrients are more sustainable and health-supportive than macronutrient extremes (such as very low fat or very low carbohydrate). Another way to frame the issue is to determine how much of each macronutrient we need to avoid problems associated with either micronutrient deficiency or excess.
The Food and Nutrition Board of the Institute of Medicine has set Accepted Macronutrient Distribution Ranges (AMDR) for protein, fat, and carbohydrates based on evidence from interventional trials with support of epidemiological evidence that suggests a role in the prevention or increased risk of chronic diseases and based on ensuring sufficient intake of essential nutrients. While these dietary guidelines don’t match up perfectly with hunter-gatherers, we see some alignment with AMDR for fat estimated to be 20 to 35 percent of total energy and protein estimated to be 10 to 35 percent of total energy for adults. And while the AMDR for carbohydrates as an estimated 45 to 65 percent of total energy (and below 25 percent from sugars) doesn’t quite align with hunter-gatherer intakes, it does support the tenet that consuming too little carbohydrate can shortchange us terms of fiber, vitamins, minerals, and phytochemicals.
What About Low-Carb and Ketogenic Diets?
Extremely low-carb ketogenic diets have gained quite a bit of popularity lately. This type of diet has long been used to manage epilepsy (and to a lesser extent, other neurological pathologies, though the research is more limited), and there’s some evidence that ketogenic diets could improve the outcome of certain cancers (although, importantly, not as a treatment for cancer categorically: some tumors become more aggressive when starved of glucose!). It’s definitely true that restricting carbohydrate intake to very low levels could have therapeutic benefits in some situations.
For most of us, though, extremely low-carb diets are neither necessary nor beneficial. Previously, I’ve written about the documented adverse effects of ketosis (see “Adverse Reactions to Ketogenic Diets: Caution Advised”). Along with reported gastrointestinal disturbances, impaired mood, hypoglycemia, kidney stones, increased susceptibility to infection, long QT intervals, hair loss, muscle cramps or weakness, impaired concentration, disordered mineral metabolism, increased fracture risk, and a shift towards atherogenic lipid profiles in some people, some potential issues require much more research than we currently have available before we fully understand the long-term effects of ketogenic diets. In addition, when we consider the essential roles of insulin in the human body that are not related to the metabolism of glucose, it quickly becomes apparent that, while insulin resistance is clearly bad, avoiding dietary carbohydrate intake’s can result in similar health detriment. See The Case for More Carbs: Insulin’s Non-Metabolic Roles in the Human Body
Quantity vs. Quality
One of the biggest changes to Western diets (including the Standard American Diet) over the last 50 years is the replacement of whole foods sources of carbohydrates with refined carbohydrates.
When you compare average carbohydrate consumption in the United States now to 100 years ago (when chronic disease rates were only a fraction of what they are now), it’s not that different, averaging about 500g per day. What is different is the percentage of those carbohydrates that come from fiber, an indicator of how refined these carbohydrate sources are: the more refined a food is, the more carbohydrate grams per fiber grams it typically has. A century ago, Americans averaged about 30 grams of fiber daily (around USDA guidelines for fiber intake, and probably sufficient to support a healthy gut microbiome) whereas current dietary fiber intake averages about 15 grams (far below our recommended daily allowance). And, right when the percentage of carbohydrate coming from fiber starts to dip is right when we start seeing exponential increases in cardiovascular disease, diabetes, and obesity. See Why Is Sugar Bad? and 5 Nutrients You’re Deficient In… If You Eat Too Much Sugar
When foods are refined, it’s not just the fiber that’s stripped out. Vitamins, minerals, and phytochemicals are also lost in the refinement process, and nutrient deficiencies themselves increase risk of disease. Combined with a large body of scientific evidence showing that low-carb high-fat diets do not provide a metabolic advantage, and in fact, low-fat high-carb diets perform equally as well from a weight loss standpoint (see Portion Control: The Weight Loss Magic Bullet and New Scientific Study: Calories Matter), we’re seeing a picture where quality of carbohydrate, meaning that we’re getting them from whole-food sources like root vegetables and fruit, if far more important than total intake.
8+ Veggies Daily
Studies unequivocally show that eating a diet rich in fresh vegetables and fruit is the single most important dietary factor for reducing disease risk, see The Importance of Vegetables, and The Amazing World of Plant Phytochemicals: Why a diet rich in veggies is so important!. The most current research shows that eating 8 or more servings of vegetables and fruits daily in the minimum amount to maximize the benefits of these fiber-rich, vitamin-rich, mineral-rich and antioxidant phytochemical-rich foods. A serving is standardized at 80 grams raw, so let’s look at three examples of 8 servings of vegetables and fruit in terms of total carbohydrate intake, low, middle and higher end of the carbohydrate range
Example 1 (non-starchy veggies only):
- 1 serving of kale – 6.7g
- 1 serving of broccoli – 5.3g
- 1 serving of spinach – 2.9g
- 1 serving of green beans – 5.6g
- 1 serving of cucumber – 2.9g
- 1 serving of avocado – 6.9g
- 1 serving of celery – 2.4g
- 1 serving of purple cabbage – 5.9g
- Total carbs: 38.5 grams
- Total fiber: 16.6 grams (far short of RDA)
Example 2 (mix of starchy and non-starchy veggies with some fruit):
- 1 serving of collards – 4.3g
- 1 serving of sweet potato – 16.1g
- 1 serving of beets – 7.6g
- 1 serving of banana – 18.3g
- 1 serving of artichoke hearts – 8.4g
- 1 serving of apple – 11g
- 1 serving of carrots – 7.7g
- 1 serving of cassava – 30.4g
- Total carbs: 103.9 grams
- Total fiber: 23.4 grams (still slightly short of RDA)
Example 3 (mostly starchy veggies and fruit):
- 1 serving of parsnip – 14.4g
- 1 serving of Brussels sprouts – 7.2g
- 1 serving of taro root – 21.2g
- 1 serving of blackberries – 7.7g
- 1 serving of plantain – 25.5g
- 1 serving of kiwi – 11.7g
- 1 serving of pear – 12.2g
- 1 serving of passion fruit – 18.7g
- Total carbs: 118.5 grams
- Total fiber: 29.6 grams
As you can see, even eating 8 servings of vegetables and fruit a day is no guarantee that we’re getting enough fiber! And, including some starchy veggies and fruit in our diets is a great way to up our fiber intake compared to only focusing on non-starchy veggies (eating more than 8 servings is also awesome!). But, you can also see how slowly the carbohydrate grams ramp up when vegetables and fruit form the major source of carbohydrates in the diet (other sources would include nuts and seeds; see also Why Fruit is a Good Source of Carbohydrates and Nuts and the Paleo Diet: Moderation is Key). This is why so many athletes following a Paleo diet add white rice into their diet to increase carbohydrate intake. There really isn’t a good argument for limiting vegetable and fruit intake (even starchy veggies). These nutrient-dense low- to moderate- glycemic load foods are awesome options for everyone!
Glycemic Load vs. Glycemic Index
It’s important to differentiate between a food’s glycemic index and its glycemic load. Glycemic index is a measure of how quickly the carbohydrates from a specific food impact blood sugar levels (the higher the glycemic index, the higher and faster blood sugar will rise after that food is eaten), but this concept doesn’t take into account that food’s carbohydrate density. Glycemic load measures how quickly the carbohydrates from a specific food impact blood sugar levels, adjusting for how many carbohydrates are likely to be consumed in a serving. Some foods have a high glycemic index but a low glycemic load: while the sugars in those foods are easily absorbed and cause a rapid impact on blood sugar, there aren’t that many of them, so these foods are often still healthy choices (watermelon is a good example; see the table below). Generally, a low glycemic load carb-containing food means that it’s a healthy slow-burning carbohydrate choice.
If Sugar is Bad, How About Sugar Substitutes?
Low-carb products are filled with sugar substitutes, like high-fructose based sweeteners like agave, artificial sweeteners, sugar alcohols like sorbitol and even “natural” sweeteners like stevia and monk fruit extract. These are all covered in detail in: Is It Paleo? Splenda, Erythritol, Stevia and other low-calorie sweeteners, Is It Paleo? Fructose and Fructose-Based Sweeteners (I’m looking at you, Agave!), The Trouble with Stevia, and What’s the Next Superfood Sweetener?
Healthy Paleo Carbs to Choose From
When whole fruits and vegetables are the major source of dietary carbohydrates, even the “carbiest” options tend to be packed with nutrients and fiber and have a low or moderate impact on blood sugar levels. The following are healthy carbohydrate-rich foods, packed with fiber, vitamins and minerals!
|Glycemic Index (glucose = 100)||Serving Size||Glycemic Load||Fiber||Nutrients (more than 10% of RDA in one serving)|
(1 medium = 182 g)
|5||2.9 g||Vitamin C, polyphenols|
(1 medium = 118 g)
|11||3.1 g||Vitamins B6 and C, potassium, manganese|
(½ fruit = 123 g)
|3||1.9 g||Vitamin C, carotenoids, betaine|
(1 cup = 151 g)
|11||1.1 g||Vitamins C and K|
(1 medium = 76 g)
|6||3.6 g||Vitamins C, E, and K, potassium, copper|
(1 medium = 130 g)
|5||2.8 g||Vitamins B9 and C, betaine|
(1 cup cubes = 165 g)
|8||2.2 g||Vitamins B6 and C|
(1 medium = 150 g)
|5||1.8 g||Vitamin C|
(1 medium = 178 g)
|4||3.7 g||Vitamin C, chromium|
(1 cup chunks = 165 g)
|4||1.7 g||Vitamin C, magnesium, bromelain|
(1 cup cubes = 152 g)
|4||0.5 g||Vitamin C, carotenoids|
|Acorn squash*||75||150 g|
(1 cup cubes = 205 g)
|6||5.3 g||Vitamins B1, B6, and C, magnesium, potassium, manganese, carotenoids|
(1/2 cup sliced = 85 g)
|5||3.4 g||Vitamin B6, manganese, betaine|
|Butternut squash*||72||150 g|
(1 cup cubes = 205 g)
|6||3.0 g||Vitamins B1, B3, B6, B9, C, and E, magnesium, potassium, manganese, carotenoids|
(1/2 cup sliced = 78 g)
|2||2.3 g||Vitamin K, carotenoids|
|Cassava, boiled||46||100 g|
(1 cup cubed = 206 g)
|12||1.8 g||Vitamin C, manganese|
|Green plantain*||40||120 g|
(1 cup sliced = 154 g)
|13||2.8 g||Vitamins B6 and C, magnesium, potassium, carotenoids|
(1/2 cup sliced = 78 g)
|4||2.8 g||Vitamins B9 and C, manganese|
|Potato, baked||85||150 g|
(1 small = 138 g)
|26||3.3 g||Vitamins B1, B3, B5, B6, B9, C, and E, magnesium, potassium, phosphorous, copper, manganese|
|Potato, boiled||54||150 g|
(1/2 cup chopped = 78 g)
|15||3.0 g||Vitamins B1, B3, B5, B6, B9, C, and E, magnesium, potassium, phosphorous, copper, manganese|
|Sweet potato||61||150 g|
(1 cup cubed = 200 g)
|17||3.8 g||Vitamins B6 and C, potassium, manganese, carotenoids|
(1 cup sliced = 132 g)
|4||7.7 g||Vitamins B1, B6, C, and E, magnesium, phosphorous, potassium, copper, manganese|
(1 cup chopped = 144 g)
|2||3.1 g||Vitamin C|
|Rutabaga (swede)||72||150 g|
(1 cup cubed = 170 g)
|7||2.7 g||Vitamin C, magnesium, phosphorous, potassium, manganese|
(a cup cubed = 136 g)
|20||5.8 g||Vitamins B1, B6, and C, potassium, copper, manganese|
*plantain and winter squash are technically fruits, but they cook like vegetables which is why they are grouped with other veggies in this table
So, How Many Carbs Should We Eat?
So, what’s the take-home message as far as carbohydrate recommendations go? For most people, going below 50 grams of carbohydrate per day for extended periods isn’t a good idea (unless a ketogenic diet is being used therapeutically for a specific condition and while under close medical supervision). A range of 100 to 200 grams (total carbohydrate) per day is generally the most sustainable and fits well into a nutrient-dense balanced diet, but people can thrive on intakes up to even 300 grams (especially individuals with high calorie needs or very active lifestyles). These ranges are supported by evidence from healthy hunter-gatherer societies and help ensure our diets are nutrient-dense and have a diverse mix of plant and animal foods!
Cordain L, et al. “Plant-animal subsistence ratios and macronutrient energy estimations in worldwide hunter-gatherer diets.” Am J Clin Nutr. 2000 Mar;71(3):682-92.
Eaton SB & Konner M. “Paleolithic nutrition. A consideration of its nature and current implications.” N Engl J Med. 1985 Jan 31;312(5):283-9.
Gross LS, et al, Increased consumption of refined carbohydrates and the epidemic of type 2 diabetes in the United States: an ecologic assessment. Am J Clin Nutr. 2004 May;79(5):774-9.
Hylla S, et al. “Effects of resistant starch on the colon in healthy volunteers: possible implications for cancer prevention.” Am J Clin Nutr. 1998 Jan;67(1):136-42.
Johnston KL, et al. “Resistant starch improves insulin sensitivity in metabolic syndrome.” Diabet Med. 2010;27:391-397.
Nilsson AC, et al. “Including indigestible carbohydrates in the evening meal of healthy subjects improves glucose tolerance, lowers inflammatory markers, and increases satiety after a subsequent standardized breakfast.” J Nutr. 2008;138:732-739.
Ströhle A & Hahn A. “Diets of modern hunter-gatherers vary substantially in their carbohydrate content depending on ecoenvironments: results from an ethnographic analysis.” Nutr Res. 2011 Jun;31(6):429-35.