Potatoes for Gut Health (and Keto!)

Strohauer Farms’ Definitive Guide to Resistant Starch

“Tater haters need to chill. I want you all eating potatoes again.” ~ Dr. Oz in March of 2018. 

Why is Dr. Oz including potatoes in a healthy diet? Many people today would attribute potatoes going straight to the gut, and ironically, they are right. While many Americans today shun the white potato in their diets, they are missing out on critical nutritional needs our guts demand: resistant starch (RS), specifically from potatoes. Mark Sisson in his Mark’s Daily Apple blog proposed, “[...] with more and more science emerging every day, it’s becoming obvious that the gut biome is the next health frontier.” Scientists, medical practitioners and nutritional thought leaders are now learning about how much of our health is affected by our gut microbes and their need to be fed prebiotics, specifically the kind derived from resistant starch.

One of the major developments in our understanding of the importance of carbohydrates for health in the past twenty years has been the discovery of resistant starch.
— Joint Food & Agricultural Org. of the United Nations / WHO, 1997; The Potato Hack, pg. 160

What is Resistant Starch?

The beauty of resistant starch is that it doesn’t break down into glucose. It isn’t broken down at all in the body, but instead becomes food for the gut.
— Diet Doctor

It’s a type of starch that acts more like a fiber and isn’t consumed in your small intestine, therefore, making its way intact to the large intestine. It resists digestion. Our digestive enzymes cannot break it down. This keeps our bodies from secreting insulin. Why is this a good thing? It’s food that our gut bacteria eat. Our intestinal bacteria receive fuel from prebiotics, such as resistant starch, that produce beneficial short-chain fatty acids, such as butyrate, from the process of being fermented in the large intestines. These short-chain fatty acids provide anti-inflammatory compounds essential for gut, immune, brain and metabolic health. They allow the gut lining to remain intact and healthy, improving the integrity and function of the gut. This is vital to maintaining a healthy metabolism, improving blood sugar, and promoting weight loss and many other optimal bodily functions. Resistant starch will not act as a carbohydrate. It is food for your gut bacteria. What your body does absorb has been converted into fat (short-chain fatty acids). Resistant starch ultimately increases your body’s ability to burn fat.

This can prevent the liver from using carbs as fuel and, instead, stored body fat and recently consumed fat are burned.
— Janine Higgins, PhD, Nutrition Research Director, CU's Adult and Pediatric General Clinical Research Center

Why Resistant Starch - Health Benefits

Resistant starch has the potential to become the next hot nutrition trend.
— Leslie Bonci, RD, author of the American Dietetic Association's Guide to Better Digestion

The Potato Hack by Tim Steele (TaterTot) is considered to be one of the most in-depth research resources on the benefits and importance of resistance starch in the human diet. Below are included a few excerpts from his book on the health benefits derived from RS, as well as how RS is showing to affect cancer and weight loss.

Studied effects of RS to (The Potato Hack, pg. 171):

-       Improve bowel health

-       Lower pH

-       Increase epitheleal thickness

-       Kill cancer cells

-       Lower postprandial glycemia

-       Increase insulin sensitivity

-       Reduce body weight and prevent weight regain

-       Decrease inflammation in the intestines and entire body

-       Reduce the risk of breast cancer and colorectal cancer

-       Reduce cholesterol/triglycerides

-       Increase production of brain neurotransmitters serotonin and melatonin

-       Remove certain pathogens from small intestine

-       Preserve Vitamin D in the body

-       Increase mineral and vitamin production and uptake

-       Remove toxins and heavy metals from the bloodstream

-       Increase satiety and regulate hunger hormones

-       Reduce fat storage after meals

-       Improve gut microbiome (synergy, prebiotic, symbiotic)

-       Protect probiotic bacteria

Resistant Starch for Gut Health

Our gut houses 70% of the immune system, as well as 70% of produced serotonin. The gut is where hormones are regulated and produced. Hormone levels affect a multitude of bodily regulations. When the gut bacteria and cells of the intestinal lining are fed, insulin sensitivity is improved, the estrobolome is assisted (bacteria that metabolize toxic estrogens), and there also seems to be a positive effect on blood sugar regulation. The gut is also where we metabolize nutrients as well as neutralize pathogens. This process of binding to and expelling bad bacteria can explain why people suffering from Candida do very well on resistant starch.

Eating any type of starch helps to boost serotonin levels in the body. The healthiest populations in the world (Blue Zones) include a good amount of starch in their diets, including places like Peru, where the potato originated. Eastern European food staples include potatoes and sauerkraut as well, both prebiotic food sources.

Resistant Starch for Butyrate Production

The short-chain fatty acid, butyrate, strengthens your brain and gut. It is the preferred energy source of the cells lining the colon. It helps to increase metabolism while also decreasing inflammation. Resistant starch feeds the good bacteria responsible for the production of this beneficial fatty-acid. These good bacterias include bifida and lactobacillus. Many people are deficient in these types, especially if they were not breastfed. Resistant starch can allow us to colonize our gut with more of these good guys.

It turns out, butyrate has been around in the mammalian gut for so long that the lining of our large intestine has evolved to use it as its primary source of energy. It does more than just feed the bowel, however. It also has potent anti-inflammatory and anti-cancer effects. So much so, that investigators are using oral butyrate supplements and butyrate enemas to treat inflammatory bowel diseases such as Crohn’s and ulcerative colitis. Some investigators are also suggesting that inflammatory bowel disorders may be caused or exacerbated by a deficiency of butyrate in the first place.
— Stephan J. Guyenet, PhD, author of The Hungry Brain

Resistant Starch for KETO - “Potatogenic”

Resistant starch is low carb, high fat - with the added bonus of being food for the gut. Tim Steele suggests one of the most widely studied effects and potentially its biggest selling point is how RS reduces fasting blood sugar. It increases satiety, and it may also allow us to stay in ketosis longer without the downside of a zero-carb diet. Tim Steele suggests The Potato Hack as an alternate approach to a keto diet:

  • “While most keto-gurus are touting high fat to get into ketosis, guess what also works … POTATOES! That’s right folks, eat nutting’ but spuds for a couple days and you will be in ketosis. Potasis, ketatosis, spudogensis, ketuberos, whatever you call it, it happens. Like magic.”

  • “It turns out that to be in ketosis, that is, ‘a metabolic state characterized by raised levels of ketone bodies in the body tissues,’ one needs not eat high levels of fatty foods, but one can also eat high levels of potatoes. You see, when you are eating less than your body needs, your body automatically switches to creating and burning ketones from your bodily fat stores. Fat is just a red herring. If you overeat typical keto treats, you will not lose weight, but gain. And there are no end of these ketogenic diet treats available nowadays.”

  • “After about 36 hours of eating a simple potato-only diet, you will be in a state of ketosis.”

The cool part about resistant starch in relation to digestible starch is that its fermentation yields butyric acid, a short chain fat that actively improves insulin sensitivity and blood glucose control. In other words, it helps you become more tolerant of the carbs you can digest.
— Mark Sisson, Mark’s Daily Apple blog

Resistant Starch for Weight Loss

When it comes to losing weight, resistant starch is an amazing ally! It allows us to control our weight because of its fat burning and hunger curbing effects. Bulletproof Founder, Dave Asprey, references a study that found women who ate pancakes made with RS plus protein burned more fat after a meal than women who ate pancakes without RS. He references another study that found adding RS to meals could make you feel fuller, quicker, causing you to eat fewer calories. It’s this ability of resisting digestion that explains why we do not see spikes in blood glucose or insulin after eating RS and why we do not obtain significant calories.

“What is very apparent in the studies of RS and weight is that when gut bugs are fed RS, they will do everything in their power to help get you to a lean, healthy state. Studies that look simply at weight often fail to see reductions because RS can actually lead to a heavier, thicker, healthier intestinal tract and increase the numbers of bacteria living there - a weight gain everyone should be happy with. Another interesting field of research into RS has to do with regaining weight lost through exercise; it was found that after losing a considerable bit of fat, keeping it off was easier with RS than with continued exercise - and certainly intestinal microbe driven through better hunger signals and fat storage hormones. What is really exciting is that the addition of RS, post weight loss, clearly showed a trend toward muscle growth and away from fat storage - the main goals for improving insulin sensitivity.”

“You may have heard of ‘cortisol,’ a stress hormone that often stymies weight loss and muscle building progress. Well, cortisol is no match for RS … cortisol is lowered on an RS supplemented diet and helps explain the reduction in weight regain and also has been implicated in whole-body energy metabolism. The cortisol connection is entirely driven by gut bugs and is probably one of their most important contributions to our overall health.”

~ Tim Steele, The Potato Hack, pg. 173

Resistant Starch and Cancer

“Due to its ‘resistant’ nature, RS is being used in chemotherapy to protect cancer drugs from digestive processes and to target colon cancer cells. When drugs are coated with a RS layer of a particular thickness, a precise targeting method is produced with profound impact on the treatment of bowel cancer. And lastly, breast cancer is seeing the benefits of RS therapy. Breast cancer is a huge concern for women on estrogen therapy - recent mouse studies have shown a decrease in breast cancer cells and improvements to how their bodies metabolized circulating estrogen. To get the benefits of RS for breast and other cancers, one simply has to eat RS rich foods.”

“Nearly all of the studies done on RS in the last 3 years have been centered around cancer prevention and cures - and not just colorectal cancer, but also breast cancer and the use of RS as a chemotherapy enhancer. RS has been shown to reduce the survival of human colon cancer cells through its stimulation of short-chain fatty acids. When cancer cells are exposed to high doses of RS boosted butyrate, they are killed through DNA fragmentation, also known as cell apoptosis. A diet high in RS has been shown to prevent the formation of cancer cells altogether.”

~ Tim Steele, The Potato Hack, pg. 175

Resistant Starch —> Increased Butyrate Production = Less Inflammation


Potato Starch for Resistant Starch

Why use potato starch? It’s a safe, concentrated form of resistant starch, it’s inexpensive and it can be easily found in any local grocery store. Potato starch is generally well-tolerated, even by people who experience nightshade allergies. It has been found that many people who cannot eat potatoes do not react to unmodified potato starch. It can be worth trying for these people. Start slowly, such as only 1/4 tsp of potato starch before slowly building up. As with anything, it can take the body six or more weeks to adjust to new dietary changes, so keep that in mind while experimenting. In The Bulletproof Diet, Dave Asprey adds, “Another benefit of resistant starch is that when taken at night, it can stabilize blood sugar and provide building blocks for serotonin, helping you sleep better,” (pg. 52). This effect is also supported and promoted by Dr. Mark Hyman. Potatoes are also packed with nutrients - rich in B vitamins and minerals, like potassium. Potatoes actually have more potassium than bananas. One medium potato contains more than a quarter of daily vitamin C needs. Potatoes of loads of phytonutrients.

How much RS should be included in your diet?

It’s recommended to try and get in anywhere from 30-40 grams per day. Below shows you how much potato starch is needed to reach this goal from different potato starch sources:

-       1 Tbs. of potato starch = 9 grams of RS

-       1 medium raw potato = 22 grams of RS

-       1 medium potato cooked & cooled = 3.5 grams of RS

-       1 medium potato cooked & cooled, then reheated = 4 grams of RS

RS vs. Fiber

Often people wonder what the difference is between RS and fiber. Below are a couple, quick excerpts from The Potato Hack on their differences. We are beginning to see the effects of misguided information on increasing fiber rather than focusing on increasing resistant starch in our diets. As more research and information is presented on these differences, we will update this section of our RS guide.

The 15-20 grams of dietary fiber that most people consume daily doesn’t even account for 25% of the butyrate producing fiber we need, however, adding 20-40 grams of RS would bridge this gap nicely.
— Tim Steele, The Potato Hack, pg. 181
Rural Native Africans eating a very basic diet high in resistant starch and low in dietary fiber have a colorectal cancer rate of less than 1 in 10,000. Australians eating a diet low in RS and high in dietary fiber have a colorectal cancer rate of 1 in 12.
— Tim Steele, The Potato Hack, pg. 178

Net Effect of RS

Many people today follow some form of a lower carbohydrate or cyclical carbohydrate diet. It’s important to realize that RS is not digested as a carbohydrate but rather a fat. Our healthy gut bugs are the beneficiaries of these calories and convert them to short-chain fatty acids. Therefore, 4 Tbs. of potato starch = approximately 54 calories from fat.  

How to Feed a Healthy Gut

Let’s make this practical. Below are some ways to not only incorporate potato starch in your diet but also other forms of RS.

Increase your RS3 consumption by cooking, cooling & then reheating your potatoes, rice or beans. Foods with the highest levels of RS are raw potatoes, green bananas, plantains, cooked & cooled potatoes, cooked & cooled rice, parboiled rice and cooked & cooled properly prepared (soaked or sprouted) legumes. Grocery store sushi that’s been cooling in the refrigerator will also have a good amount of RS. (A fun sushi tip from Bulletproof Diet founder, Dave Asprey, is to drizzle MCT oil over sushi to provide a barrier against quick digestion for an added tastebud bonus!) Another way to increase your levels of RS3 is to cook your potatoes ‘al dente. This means you slightly undercook them which retains more of their resistant starch. Dr. Oz is a big proponent of this way of potato preparation. Potatoes will be slightly undercooked if they are slightly crunchy and there’s some resistance when you try to take a knife through them. Keep in mind, sweet potatoes have almost no RS.

Increase your RS2 consumption by mixing 1-4 Tbs. raw unmodified potato starch (not flour and must be unmodified) into either a cold glass of water, mineral water like Pellegrino, probiotic liquids such as Kombucha, milk (almond, coconut, cow, goat, etc.) or in your yogurt. By mixing potato starch in your yogurt or probiotic liquids, it’s increasing the absorption rate of the probiotics by helping them bypass the small intestine and having a better chance of reaching the large intestine intact. A sparkling water is also great with RS because the bubbles seem to enhance the dispersal of the potato starch granules throughout with no need for a blender. Try Bob’s Red Mill Unmodified Potato Starch (always uncooked!). You can also try mixing in a green banana with your smoothie. One large, green and unripe banana will contain about 20-25 grams of RS. Other good sources that can be used are plantain flour, green banana flour and tapioca starch. A final, fun option can be to mix the potato starch into your morning Bulletproof Coffee after you’ve added the butter, so it’s not hot enough to destroy the starch (keep it under 160 degrees).

Supplement your RS with probiotics. This is especially important if you experience negative side effects with RS. That is a strong indicator your gut is not healthy, and probiotics will help you. Bulletproof’s InnerFuel Prebiotic, Primal Defense Ultra, AOR Probiotic-3 and Prescript Assist are the most highly recommended supplements from thought leaders in the resistant starch arena, such as Tim Steele, Richard Nikoley and Dave Asprey.

Eat inulin containing vegetables, not to be confused with insulin, such as Jerusalem artichokes and psyllium. These prebiotic-rich foods are also great sources of resistant starch. One of today’s leading Ketogenic diet and its effects’ researchers, Dominic D’Agostino, and Primal lifestyle founder, Mark Sisson, both include Jerusalem artichokes in their diets. Other prebiotic-rich foods include acacia gum, raw chicory, dandelion leaves (into salads), bananas, onions, garlic, leeks and pistachios. It’s great to incorporate these into a well-balanced diet daily. Tim Steele’s recommendation here is to combine potato starch with psyllim husk fiber to even further increase butyrate production in the colon.

Include healthy fats, such as coconut oil, when cooking rice or potatoes. When these are cooked together, the oil from the healthy fat binds to the digestible starch. The digestible starch is the typical starch in our diets that is converted into glucose, not RS. With the binding of the oil, the digestible starch begins to crystalize, thus creating RS. Also cooling the starch with the healthy fat included allows the crystallization process to occur. One study found this increased the amount of RS by 10-15 times![1]

Incorporate refeed days. For those who eat similar versions of either a Ketogenic, Cyclical Ketogenic, Anabolic, Bulletproof, Paleo, Atkins or Modified Atkins diet, carbohydrates are consumed in smaller and fewer amounts, so it’s harder to get in the daily requirements of RS. Although RS can be counted as grams of fat rather than carbohydrates, unless you’re only eating a concentrated form of starch (such as potato starch), other sources will still contain starches that are quickly digested in the small intestine and converted into glucose. “Refeed days” are promoted by most of the above listed diets, where 1-2 days per week the amount of carbohydrates consumed is increased. This is a great opportunity to incorporate RS3 in the form of cooled potatoes or rice. Ideally, eat RS-rich foods on days you work out, especially after a glucose depletion day such as heavy lifting or a HIIT workout. Your liver and muscle glycogen storages will be depleted, so instead of storing the ingested carbs in the bodies’ fat cells, they will immediately be shuttled to those depleted reserves.

Keep your gut guessing. Feed it like it would be fed in an unprocessed world. Vary the doses or amounts you consume of RS each day. Sometimes skip days where you don’t consume RS. Incorporate various forms. Make sure you’re getting both RS2 and RS3, as different bacteria in our guts want each of these. As we hear in the nutrition world all the time, keep your body guessing.

Finally, get your hands in the dirt! Soil contains a healthy dose of probiotics. Here at the farm, we don’t have too much trouble with this tip. Consider growing a garden or planting flowers.

If you’re looking to optimize your health, increase weight loss, improve your metabolism or any of the other health benefits previously described, resistant starch is a great nutrient source to consider including in your diet. Potato starch is not only one of the most readily RS sources available, but the humble potato has all the nutrients a person needs to survive. It’s a powerhouse vegetable, and it’s the most recommended source for resistant starch. Give it a try, and let us know what you think in the comments below.

If it’s produce, it’s fine. Portions + Preparation = Potato Math.

It’s a nutritional vegetable that we turned into junk food. We made a good thing bad, but it’s Nature’s diet pill.
— Dr. Oz

Here’s a great recipe for a Resistant Starch Potato Salad from Mark’s Daily Apple blog: http://www.marksdailyapple.com/resistant-starch-potato-salad/#axzz49tGDCPx

Servings: 4 to 6

Prep Time: 20 minutes + 8 hours inactive

Cook Time: 30 minutes


  • sea salt & pepper

  • 8 medium potatoes

  • 1/4 to 1/3 cup mayo (Primal Kitchen Mayo recommended)

  • 2 Tbs. mustard

  • 1 bunch green onions

  • 4 boiled eggs


Peel the potatoes if desired. Cut into bite-sized pieces. Boil them with a few pinches of salt until barely cooked and then drain. Set potatoes aside until cool. Place them in a bowl, cover and chill overnight (must do this step for RS to occur).

In the morning, add the salt & pepper liberal with the mayo and mustard. Slice the green onions and chop the eggs and add them. Mix everything together and adjust seasonings to taste. 

Serve & enjoy! 


Great RS Resources:

-       The Potato Hack by Tim Steele

-       The Bulletproof Diet by Dave Asprey

-       Eat Fat, Get Thin by Dr. Mark Hyman

-       Article, Blog & Video Links


[1] https://www.bulletproofexec.com/low-carb-carbs-hack-your-rice-with-coconut-oil-recipe/