Dear Mark: What’s With The Bean Protocol?

For today’s edition of Dear Mark, I’m answering a reader question about beans. But it’s not just about beans. It’s about something called the Bean Protocol, a rather new dietary approach that many of my readers have expressed interest in. The Bean Protocol is supposed to improve the liver’s ability to clear out toxins, thereby preventing them from recirculating throughout the body in perpetuity. Today, I’m going to discuss where it fits in a Primal eating plan.

Let’s go:

Hi Mark,

Have you heard about this “Bean Protocol”? From what I can tell people are eating tons of beans and getting great results. It’s supposed to remove toxins from the liver or something else that only beans can do.

What do you think?

Thanks,

Matt

I did some digging around. I read the Bean Protocol coverage over at PaleOMG, where Juli has been following the protocol for several months now and seeing great results. There’s a Bean Protocol E-course that I did not sign up for, but I think I have a decent handle on the topic.

How to Do the Bean Protocol

Here’s the gist:

• No caffeine
• No sugar
• No dairy
• No gluten
• No processed food
• No factory-farmed meats; no fatty meats
• Eat 6-8 half-cup servings of beans or lentils a day.
• Fill the rest of the food with lean meat, leafy green vegetables, alliums (onion, garlic, leek, etc), and cruciferous vegetables (broccoli, cabbage, cauliflower).

What’s Supposed to Happen on the Bean Protocol

The soluble and insoluble fiber in the beans binds to toxins which the body can then flush out more easily. Without the fiber from the beans, your body can’t process and excrete the toxins, so they simply recirculate, stay in the body, and sometimes express themselves in the form of acne and other diseases. Adherents credit the bean protocol for fixing longstanding issues like acne, Crohn’s, and many other conditions.

Is this true? Is there any evidence of this in the scientific literature?

Well, there isn’t much direct evidence for beans improving liver clearance of toxins, but there is circumstantial evidence. For one, prebiotic fiber is good for liver health. There are plenty of studies to support this.

Synbiotics (a combination of probiotics and prebiotics) and BCAAs taken together improve hepatic encephalopathy, a feature of liver failure where the liver fails to detoxify excess ammonia.https://pubmed.ncbi.nlm.nih.gov/28583137/‘>² Inulin also increases bile flow.https://pubmed.ncbi.nlm.nih.gov/21815229/‘>⁴

Cruciferous Vegetables

The Bean Protocol also emphasizes cruciferous vegetable consumption. The crucifers, which include cabbage, broccoli, cauliflower, and kale, can exert beneficial effects on liver health. Sulforaphane, one of the most prominent compounds in cruciferous vegetables, has well-established effects on toxin clearance. It can speed up the clearance of airborne pollutants and counter the carcinogens formed from high-heat cooking.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2959165/?tool=pubmed‘>⁶

Back to Basics

By emphasizing lean meats and eliminating sugar, alcohol, and industrial food, you are eliminating the major causes of fatty liver in the diet: sugar, seed oils, and alcohol.

My point is not to disparage the Bean Protocol. I think it has some merit. My point is to point out that beans alone probably don’t explain the benefits people are seeing. There’s a lot more going on than just beans.

Lectins and Phytic Acid in Beans

Okay, okay. So while beans aren’t the only (or even necessarily the best) way to obtain prebiotic fiber to modulate gut bacteria and improve liver health and therefore toxin clearance and metabolism, they are promising. But aren’t beans bad for you? Aren’t they neolithic foods full of lectins and anti-nutrients that are anything but Primal?

Lectins are anti-nutrients and beans do have them. Studies show that they can damage the intestinal lining, prey upon already-damaged intestinal lining, and prevent the body from repairing that damage.https://www.ncbi.nlm.nih.gov/pubmed/25599185‘>⁸ People have actually been hospitalized from lectin poisoning.http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2621.1990.tb06789.x/abstract‘>¹⁰

Most of the research indicting legume lectins used animals consuming large amounts of raw lectins. Those people who got lectin poisoning ate undercooked kidney beans. Don’t eat raw or undercooked beans and make sure they’re soaked overnight. Canned beans are also prepared pretty well.

Okay, what about phytic acid?

Phytic acid is the primary storage form of phosphorus in plants. When you eat a food containing phytic acid, it can bind to several other minerals, like calcium, magnesium, and zinc, and prevent their absorption. Diets based entirely in high-phytate foods can thereby lead to nutrient deficiencies. As legumes are one such high-phytate food, people are justifiably cautious about basing their diet on them.

Soaking legumes is really good at reducing phytic acid. In one study, cooking straight up without soaking reduced phytate by 20%, cooking after soaking in the soaking water reduced it by 53%, and cooking after soaking in fresh water reduced it by 60%.https://www.ncbi.nlm.nih.gov/pubmed/12887152‘>¹⁴ That basically takes care of the problem.

If you want to really eliminate phytic acid you can sprout your legumes. You can also buy pre-sprouted beans.

What about the carb content of beans?

Legumes are higher in carbs than many other Primal foods but not as high as you might think. The musicality of the legume partially offsets its carbohydrate density. All those sugars and fibers being digested by gut bugs and producing the farts are carbs that you aren’t consuming as glucose. If you pay attention to “net carbs,” you’ll love legumes—at least compared to something like potatoes or bread.

Which, by the way, is why legumes appear to be so helpful in the Bean Protocol.

A half cup of cooked black beans has 20 grams of carbs with 7.5 coming from fiber.

A half cup of cooked chickpeas has 30 grams of carbs with 5 coming from fiber.

A half cup of cooked pinto beans has 22 grams of carbs with 7.7 coming from fiber.

A half cup of cooked lentils has 20 grams of carbs with 7.8 coming from fiber.

And much of that fiber, remember, comes in the form of galactooligosaccharides, that same prebiotic shown in studies to improve gut health and even increase lead excretion. But these are also FODMAPs, which, depending on your gut biome, can be helpful or painful. Some people won’t be able to handle the gas, some will get downright painful bloating, while others will get huge prebiotic benefits. Your mileage may vary, so just figure out what works.

Are beans actually nutritious, though?

Legumes aren’t nutrient-dense compared to something like liver or oysters, but they’re more nutrient-dense than grains and many other foods.

Again, a half cup of beans isn’t very many carbs. Maybe 20 grams, with only two thirds of that turning into glucose. You’ll get a lot of food for your gut and a decent whack of some important nutrients like folate, copper, magnesium, and manganese. That half cup of black beans provides 32% of your daily folate requirements, 20% of copper, 14% of magnesium, and 17% of manganese. A half cup of lentils provides 45% of your daily folate requirements along with 28% of copper and 21% of manganese. Not bad for a measly 20 grams of carbs.

A Plea: Lentils

If you want to try the Bean Protocol and insist on doing the 8 servings a day version, I’d recommend you go with lentils.

A cup of standard lentils gets you:

• 40 grams carbs, almost 16 g fiber.
• 230 calories.
• 18 grams protein. Legume protein can’t replace animal protein, but it can offset some of your requirements.
• 90% of folate.
• 28% of vitamin B1 (thiamine), 25% of vitamin B5 (pantothenic acid), and 21% of B6 (pyridoxine). B vitamins generally aren’t issues for folks eating Primal, but they can’t hurt.
• 55% of copper.
• 17% of magnesium.
• 43% of manganese.

Lentils added to a meal slow gastric emptying, which should keep a person fuller longer.