Gluten-Free in the News (some Yay! some Nay!)

February 6, 2013 in Paleo Philosophy

Two news stories centered around gluten-free diets were published in the New York Times in the last week, one the magazine section and one in the science/health section.  I’d like to take this opportunity to give a huge shout-out to the NYT for having staff science writers (who actually have science backgrounds!).  So few media outlets have science reporters any more and I believe this is one of the biggest hurdles we face as a society in battling the enormous amount of misinformation out there.  There is a need for people with science backgrounds and a talent for distilling and explaining science to report on it in the media.  There’s a need, but there’s no money–most media outlets aren’t hiring.

03arthritis1-articleLarge-v2The first story The Boy With a Thorn in His Joints was published February 1st.  It excited many people with its explanation of the link between gut health (and specifically a leaky gut) and inflammation.  It shares the story of a 5-year old boy named Sheperd, diagnosed with the intensely painful autoimmune disease juvenile idiopathic arthritis at 3-years old, who found no answers with conventional medicine (either NSAIDs or DMARDs).  The story is told by Shepherd’s mother and her reports of interactions with her son’s pediatric rheumatologist make me angry.  I had similar experiences with my daughter’s pediatric gastroenterologist (one of the top in the country) who thought that putting my daughter on a dairy-free, gluten-free diet  was nonsense (and yet is cured her of her obstructive sleep apnea, so there!).

Shepherd’s parents finally hit a desperate point where they were willing to try “complimentary medicine” approaches.  They switched Sheperd to a gluten-free, dairy-free, nightshade-free and refined sugar-free diet in conjunction with supplements including fish oil, probiotics, sour Montmorency cherry juice and a Chinese herbal supplement called four-marvels powder.    In 6 weeks, Shepherd starting recovering, feeling less pain and having more mobility.  Not long afterward, they were able to wean him off of DMARDs and now report that the only times that Shepherd has had flares in the last year is after accidentally eating gluten or needing to go on antibiotics.

This story is powerful.  Emotional and triumphant.   The agony of waiting for something to work for six whole weeks, not knowing if it will, the stress the anxiety are palpable.   The sheer joy at being able to “fix” your child’s problem, but with always that seed of doubt of whether it will return, hit home.   And the explanation that arthritis is caused by a leaky gut which causes inflammation and stimulates the immune system  is a very good one.   I have no doubt that there are many families now researching gluten-free, dairy-free diets for their children.  Maybe some of the will take that small extra step and try a paleo diet.

05well_gluten-tmagArticleThe second story Gluten-Free, Whether You Need It or Not, published February 6th, presents the mystery and controversy around gluten sensitivity.  The controversy is really one of definition.  It is now being recognized that there exists celiac disease, wheat allergy, gluten intolerance and gluten sensitivity.  This paper in the very high impact research journal Gut (I always did love that name) suggests using the term “gluten-related disorders” as an umbrella term for all of these related but disparate conditions.  The problem is that gluten sensitivity is not well defined or well understood (hence the mystery).  There are medical professionals at both ends of the extreme, those that say it doesn’t exist versus those that claim that most people are actually gluten sensitive because humans are not adapted to digesting grains.

The article explains some very important points.  The incidence of celiac disease is increasing.  This might be because GMO grains contain more gluten.  The vast majority of celiacs remain undiagnosed.   Those who have gluten sensitivity are simply those who feel better when they follow a gluten-free diet (there is no test).  There is research showing that people with Irritable Bowel Syndrome felt better and had fewer symptoms when following a gluten-free diet (in a very cleverly designed blinded trial).  This is important information to be out there in the mainstream media!

 But, I felt irked as I read this article.  It was written by one of the NYT’s staff science writers, Kenneth Chang, who does a good job of presenting most of the many sides to this issue.  But not all the sides.  Maybe I was feeling overly defensive, being obviously part of one of the fringe and fad extremes that the article presents, but I took issue with a few statements in this article..

The article gives an anecdotal example of a women who lost weight and had her allergies go away after adopting a gluten-free diet.  The article then goes on to explain that experts are skeptical.  Quote:  “It does not make obvious sense, for example, that someone would lose weight on a gluten-free diet. In fact, the opposite often happens for celiac patients as their malfunctioning intestines recover.”  Can I jump in here?  Celiacs gain weight when their intestines recover because they can finally absorb nutrients from their food.  People who are gluten sensitive but non-celiac often lose weight when they remove gluten from their diet because they are reducing inflammation, regulating hormones, and cutting out a major source of nutrient-poor sugar-rich foods.  It actually makes total sense.

Two other statements just riled me, both implying that gluten-free diets are less healthy and so people who aren’t diagnosed with gluten-related disorders should not adopt gluten-free diets.  The first statement is a quote from Dr. Stefano Guandalini, medical director of the University of Chicago’s Celiac Disease Center.  “It is not a healthier diet for those who don’t need it,” Dr. Guandalini said. These people “are following a fad, essentially.” He added, “And that’s my biased opinion.”  Yes, that is a biased opinion.  And in my biased opinion, it’s an uninformed one.  The second irksome statement:  “They [experts] also worried that people could end up eating less healthfully. A gluten-free muffin generally contains less fiber than a wheat-based one and still offers the same nutritional dangers — fat and sugar. Gluten-free foods are also less likely to be fortified with vitamins.”

Can I jump in again?  Okay, yes, I obviously think that the vast majority of gluten-free baked goods available are not healthy.  They tend to still be grain-based and loaded with emulsifiers.  Clearly, I do not believe in simply substituting wheat with rice and corn.  But, how about those of us who choose to replace gluten-containing foods with vegetables!?  I don’t need to remind you about how much healthier vegetables are than any grain, do I?  I don’t need to say that vegetables contain more of every single micronutrient than grains, for a fraction of the sugar and at least the same amount of fiber, do I?  The same can even be said of fruit, although fruit is somewhere in the middle in terms of sugar content.  And while people who eat gluten-free (and not paleo) typically do buy some gluten-free breads and pastas, they also typically consume fewer of these types of products than people eating the Standard American Diet.  So while gluten-free baked goods might not be fortified, you can’t judge an entire diet based on them.  Yes, I’m sure there are gluten-free folks out there chowing down on empty sugary gluten-free junk and who really are eating a less healthy diet.  But, to label gluten-free as less healthy is wrong.  Cutting gluten out of your diet does not deprive you of any nutrients.  I suppose I could also mention that whole vilification of fat thing here too.  But, it’s late.  So, I’ll summarize:  fat is not bad for you.  Sheesh.

I’m sure someone else reading the story would have focused more on the other positive aspects.  Gluten-free in the news is good.  Explaining that it’s a spectrum and that it’s not just celiac is good.  Encouraging people to have a dialogue with their doctors is good.  It’s just hard for me to gloss over the fact that this article put big warning signs on gluten-free diets like somehow cutting gluten our of your diet might deprive you of vital nutrition.  Did I already say sheesh?

Let’s end on a positive note though.  Paleo is gaining momentum and, while many still consider it a fad diet, the scientific basis behind it is providing traction.  More and more, people are healing themselves by changing how they eat.  More and more, wonderful success stories like Shepherd’s stories are making headlines.   And it’s very exciting to watch people take back their health!

The WHYs behind the Autoimmune Protocol: Alcohol

November 8, 2012 in Foods in Moderation, The WHYs of the AIP

Alcohol is restricted in the paleo diet autoimmune protocol; and for those of us with autoimmune disease, it can feel like there are no pleasures left!  My inner monologue goes something like this “Seriously, first I give up grains, legumes, dairy, modern vegetable oils and refined sugar.  THEN, I give up eggs, nightshades, nuts, seeds, coffee and chocolate.  And NOW you want me to give up my wine?!  I thought red wine was supposed to be good for me! Waaaaaaah

Moderate consumption of alcohol (not just red wine) seems to provide diverse health benefits; including reducing the risk of cardiovascular disease 1, reducing the risk of developing type II diabetes 2, preventing Alzheimer’s disease 3, and it may even reduce the risk of some cancers 4. (Don’t get too excited about the cancer prevention piece… moderate alcohol consumption also increases the risk of other cancers.)  While alcohol is not technically paleo, there is certainly evidence that prehistoric man would have imbibed fermented fruit and probably got pretty darned stinkin’ drunk from time to time.  Almost every version of the paleo diet condones low to moderate consumption of alcohol (usually restricted to gluten-free alcohols, so mainly wine and spirits), including Prof. Loren Cordain and Robb Wolf.   It is a Neolithic pleasure that most people following a paleo diet still enjoy.

So, with all the research supporting that moderate consumption of alcohol (especially wine) is healthy, why is it then a problem for those with autoimmune disease?  Once again, it boils down to the fact that those with autoimmune disease have more sensitive systems and face more challenges to healing a leaky gut than others.

Alcohol consumption directly causes an increase in intestinal permeability (i.e., a leaky gut) 5.  Alcohol unravels the tight junctions and adherens junctions that glue the cells that line the gut (called gut epithelial cells or enterocytes) together to form the  barrier between the inside of the gut where undigested food and bacteria live and the inside of our body.  Effectively, alcohol creates little holes between the gut epithelial cells.  It does this through several mechanisms 5Importantly, the “holes” that alcohol makes in the gut epithelial barrier are known to be big enough to allow some very large molecules into the body, most notably endotoxin.  Endotoxin is a toxic protein derived from the cell walls of gram-negative bacteria, such as E. Coli, which live in our guts (usually in the large intestine, but often in the small intestine in those people with autoimmune disease).  As these bacteria die (as part of their normal life cycle), endotoxin is released.  If it gets into the blood stream, it stimulates systemic inflammation, stimulates the immune system, and damages the liver 5.

Normally the majority of bacteria that grow in our guts are gram-positive bacteria (although some gram-negative bacteria is normal).  What does gram-negative and gram-positive mean?  This refers to a staining technique that differentiates between these two major classes of bacteria.  Basically, gram-negative bacteria have more complex cell membranes/walls and these tend to be pathogenic (i.e., they cause disease).  E. coli is an example of a gram-negative bacteria.  Lactobacillus (the probiotic found in supplements, yogurt and fermented vegetables) is an example of a gram-positive bacteria.  So, here’s the kicker:  alcohol consumption feeds gram-negative bacteria such as E. Coli to create bacterial overgrowths of these more toxic bacteria and therefore excess endotoxin production in the gut.  Excessive alcohol consumption is also correlated with gram-negative bacteria growing very high up the digestive tract, in the duodenum and sometimes even the stomach 5,6.

So, alcohol increases the production of endotoxin within the gut and increases intestinal permeability to endotoxin.  Another toxin that is produced by both gram-negative and gram-positive bacteria is called peptidoglycan (another component of the cell wall that is released into the gut when the bacteria die).  There is evidence that alcohol increases the permeability to peptidoglycan and that this toxin is very effective at stimulating the immune system and causing inflammation 5.

And that’s not all.  Even fairly small amounts of alcohol can damage the lining of the gut; specifically, alcohol leads to “mucosal damage in the upper small intestine with a loss of epithelium at the tips of the intestinal villi, hemorrhagic erosions and even hemorrhage in the lamina propria” 5.  If that sounded bad, that’s because it is.  It’s similar to the damage caused by gluten in celiac patients.

Most of the current understanding of the link between alcohol consumption and increased intestinal permeability (a.k.a. leaky gut) comes from studies of chronic alcohol consumption.  But, there are studies to show that this damage occurs even from a single drink.  Occasional drinkers basically don’t damage their intestines as much because they don’t consume as much alcohol at one time and they have more time for the guts to heal in between drinks.  This might lead to some adaptive mechanisms, which might be part of how low-to-moderate alcohol consumption can actually provide a health benefit.

So, what does this mean for those with autoimmune disease?  If you have autoimmune disease, you have a collection of genes that makes you more susceptible to developing a leaky gut and to having an exaggerated immune reaction to substances that leak out.  This means that anything that increases intestinal permeability should be avoided.

There’s some good news.  If you are being very strict with the autoimmune protocol, you are likely to tolerate an occasional drink (make sure to stay away from any grain-based alcohols though, especially beer and ale which contain gluten).  Chris Kresser puts the limit on one 5oz glass of wine twice per week (or equivalent amount of hard alcohol that is not derived from grains such as rum, tequila, sherry, cognac and brandy).  However, I advise avoiding all alcohol until you are starting to see some success on the autoimmune protocol. 

There’s some other good news.  It’s actually the alcohol that is the problem here, which means that cooking with wine or hard liquor (where the alcohol is burned off in the cooking process) is totally okay.  Well, with one more caveat:  some people are can be sensitive to the yeast content of wine (the yeast used in wine fermentation is a potential gluten cross-reactor) or can be sensitive to the the sulfites found in wine.

In summary, alcohol is not good for anyone dealing with leaky gut issues.  However, an occasional drink once your body is healing is probably okay.  Cooking with alcohol is also probably okay for most people, even if you don’t tolerate an actual drink.  But once again, I do urge caution as you experiment to find where your individual line is.

1 http://www.sciencedaily.com/releases/2011/02/110222192913.htm

2 Mekary RA et al “Joint association of glycemic load and alcohol intake with type 2 diabetes incidence in women” Am J Clin Nutr December 2011 ajcn.023754

3 http://www.jsonline.com/features/health/50590097.html

4 http://www.theatlantic.com/health/archive/2012/01/the-truth-about-breast-cancer-and-drinking-red-wine-or-any-alcohol/251171/

5 Purohit V et al “Alcohol, Intestinal Bacterial Growth, Intestinal Permeability to Endotoxin, and Medical Consequences” Alcohol. 2008 August; 42(5): 349–361.

6 Sekirov I et al “Gut Microbiota in Health and Disease” Physiol Rev, 2010 July; 90( 3): 859-904

The Great Dairy Debate

October 13, 2012 in FAQ, Foods in Moderation, The WHYs of the AIP

The value (or lack thereof) of dairy products is the second most fiercely debated topic within the paleo community (after carbohydrate intake).  Opinions vary dramatically from consumption of no dairy whatsoever, to only consuming dairy fat (such as ghee, butter and heavy cream), to only consuming raw grass-fed dairy, to only consuming fermented dairy or aged cheeses, to including any dairy on a regular basis.

The reason for this diversity of opinions is that the science is not clear cut.  There are strong arguments to be made both for and against.

Let’s start with the arguments against dairy.  Prof. Loren Cordain dedicates an entire well-cited chapter in his most recent book The Paleo Answer (a fantastic book for describing the nitty gritty scientific details behind the paleo diet) to the many reasons why milk should not be consumed in any form.  To summarize, what I view the strongest parts of this argument:

  • Milk is not as nutrient-dense as meat, fruits and vegetables.
  • Milk is highly insulinogenic, meaning it causes a large spike in blood insulin levels, disproportional to the amount of sugar and protein in milk.  This may contribute to the development on insulin resistance, at least in the context of a high carbohydrate diet.  Insulin is also pro-inflammatory.
  • Milk contains active bovine (cow) hormones which have the potential to alter our hormone levels.  The effects of dietary intake of most of these hormones have not been studied.  However, other hormones have been studied.  For example, the milk hormone Insulin-like Growth Factor-1 (IGF-1) has been linked to risk of breast, colorectal and prostate cancer, with the strong indication that consumption of dairy protein is a large contributor to blood IGF-1 levels 1.
  • Milk contains protease inhibitors which may contribute to the development of a leaky gut (see this post for a more in depth explanation as to why)
  • Milk increases mucus production.  This may aggravate conditions such as asthma but also creates excess mucus in the gastrointestinal tract which may irritate the gut lining and inhibit nutrient and mineral absorption.
  • Lactose is poorly tolerated by adults.  Approximately 25% of Caucasians (American and European) are lactose intolerant.  97% of Native Americans are lactose intolerant.  This argument does not apply to drinking raw milk since raw milk contains enzymes to help digest lactose.
  • Dairy is highly allergenic.  This is where I believe the chief argument against dairy lies and I will discuss this further below.

There are also some very compelling arguments for including dairy products in our diets.  Studies have shown that consumption of dairy, especially full-fat dairy products and fermented dairy products, can protect against Metabolic Syndrome (cheese, full-fat dairy, and fermented dairy), Type II Diabetes (fermented dairy only) and Cardiovasular Disease (cheese, full-fat dairy, and fermented dairy) 2-6.

Grass-fed dairy, especially the fat from grass-fed dairy, is an excellent source of fat-soluble vitamins and Conjugated Linoleic Acid, an anti-inflammatory and healing fat.  Fermented dairy is an excellent source of probiotics.  There are also some valuable proteins in dairy, such as glutathione (very important for reducing inflammation and protecting against oxidative stress) and whey (which may help prevent cancer).

There is also evidence that dairy proteins are beneficial for children due to their growth-promoting effects.  Traditionally, children would have received some breast milk until approximately 5 years of age.  In our current society, most children are weaned by age 1.  The current scientific view is that, provided cow’s milk is not introduced too early, it is a good substitute for human milk in terms of its growth promotion 7.

Yes, the science is not clear, although there seems to be a good case for including dairy fat in our diets.  This is why the standard paleo diet allows for ghee and butter, and in many cases heavy cream and full-fat sour cream.  Many people also include fermented dairy in their diets with great success.

However, one thing that is abundantly clear is that milk allergy is common.  Beyond lactose-intolerance, which can be treated with the aid of digestive enzymes or consumption of raw milk, allergy to milk proteins is very common.  Epidemiological reports of cow’s milk allergy (IgE antibody reactions to cow’s milk proteins) range between 1 and 17.5% in preschoolers, 1 and 13.5% in children ages 5 to 16 years, and 1 to 4% in adults 8.  It is not known how prevalent cow’s milk sensitivities are (IgA and IgG antibody reactions to cow’s milk proteins).  It’s important to note that goat’s milk is not as allergenic as cow’s milk.

Cow’s milk proteins are also known gluten cross-reactors, which means that those with gluten intolerance may produce antibodies against gluten that also recognize dairy proteins.  For these people, eating dairy is the same as eating gluten (more information in this post).  Very importantly, for people with allergy, intolerance or gluten cross-reactions to dairy proteins, even the trace dairy proteins in ghee can be a problem.

So, what do I recommend?  Caution.  I believe that dairy is probably okay for many healthy adults, especially full-fat, grass-fed dairy.  In fact, for healthy individuals, the benefits likely outweigh the risks.  However, for those battling autoimmune disease or other conditions where a leaky gut is a potential contributing factor, it makes the most sense to omit dairy from your diet for now.  As is my standard recommendation for all of the gray-area foods, I suggest leaving it out of your diet for at least 1 month, then try reintroducing it and see if you notice any obvious symptoms (this is the best way to determine if you are allergic or sensitive).

I am still trying to gauge my own tolerance for grass-fed butter.  My daughters both seem to do better without cow’s dairy in their diets (except grass-fed butter, which seems okay), but I have reintroduced grass-fed goat mineral whey protein powder into their diets and they seem to do really well with that (especially my oldest).  I also have intentions to try them with some grass-fed goat’s whole milk.  This is another highly individual aspect of a paleo diet and you really don’t know whether or not milk is good for you until you try living without and then try living with.

1. Crowe FL et al “The association between diet and serum concentrations of IGF-I, IGFBP-1, IGFBP-2, and IGFBP-3 in the European Prospective Investigation into Cancer and Nutrition.” Cancer Epidemiol Biomarkers Prev. 2009 May;18(5):1333-40.

2. Louie JC et al “Higher regular fat dairy consumption is associated with lower incidence of metabolic syndrome but not type 2 diabetes.” Nutr Metab Cardiovasc Dis. 2012 Sep 26. pii: S0939-4753(12)00193-7. doi: 10.1016/j.numecd.2012.08.004. [Epub ahead of print]

3. Warensjö E, et al. “Biomarkers of milk fat and the risk of myocardial infarction in men and women: a prospective, matched case-control study.” Am J Clin Nutr. 2010 Jul;92(1):194-202. Epub 2010 May 19.

4. Sonestedt E et al. “Dairy products and its association with incidence of cardiovascular disease: the Malmö diet and cancer cohort.” Eur J Epidemiol. 2011 Aug;26(8):609-18. doi: 10.1007/s10654-011-9589-y. Epub 2011 Jun 10.

5. Sluijs I et al “The amount and type of dairy product intake and incident type 2 diabetes: results from the EPIC-InterAct Study.” Am J Clin Nutr. 2012 Aug;96(2):382-90. Epub 2012 Jul 3.

6. Bonthuis M et al. “Dairy consumption and patterns of mortality of Australian adults” European Journal of Clinical Nutrition (2010) 64, 569–577; doi:10.1038/ejcn.2010.45; published online 7 April 2010

7. Agostoni C and Turck D. “Is cow’s milk harmful to a child’s health?” J Pediatr Gastroenterol Nutr. 2011 Dec;53(6):594-600.

8. http://www.worldallergy.org/publications/WAO_DRACMA_guidelines.pdf

Chris Kresser has a terrific post Dairy: food of the Gods or neolithic agent of disease?

The Paleo Answer by Prof. Loren Cordain is an excellent resource.

 

The WHYs behind the Autoimmune Protocol: Nightshades

August 22, 2012 in Featured Posts, Foods in Moderation, The WHYs of the AIP

Tomatoes, potatoes, eggplants, sweet and hot peppers (but not black pepper), and chili-based spices (including paprika) all come from plants which are members of the nightshade family.Nightshades can be problematic for many people due to their lectin, saponin and/or capsaicin content.They tend to be even more problematic for those with autoimmune disease and of all the foods restricted in the autoimmune protocol, are probably the least likely to be successfully reintroduced, especially tomatoes and chilies.

There are over 2000 plant species in the nightshade family, the vast majority of which are inedible and many are highly poisonous (like deadly nightshade and jimsomweed).Tobacco is also a nightshade, and is known to cause heart, lung, and circulatory problems as well as cancer and other health problems (clearly some of this has to do with the other toxins in tobacco products derived from the processing). Of the edible species in the nightshade family, poisoning can actually occur with excessive consumption and it is possible that the low-level toxic properties of the nightshade vegetables contribute to a variety of health issues as they progress over time 1.So, let’s talk about two (okay, three) key compounds in nightshades that make them such a common food sensitivity and a problematic food for those with autoimmune disease.

Nightshades contain lectins.Actually, all plants (and even animals) contain some lectins, a class of sugar-binding proteins with many biological roles, including protecting plants (especially the seeds of the plant) against predation.Not all lectins are problematic (I have an entire post in the works explaining why the lectins in wheat can be such an issue but the lectins in blueberries aren’t).The lectins which we avoid in the paleo diet are the ones with the ability to increase intestinal permeability (see this post on how lectins do this).These are lectins which resist digestion (typically due to high proline content), are relatively heat-stable (so there are still sufficient quantities to cause an issue after cooking), and have the ability to strongly interact with proteins in the membrane of the cells that line the intestine (and some can even bind to receptors in those membranes and be transported intact across the intestinal barrier).There is huge variability the effect of different dietary lectins, from proinflammatory and promoting a leaky gut on one end of the spectrum to completely harmless and even potentially therapeutic on the other.Until a systematic analysis is performed of all plant lectins and their physiological effects, the foods advocated and restricted on a paleo diet really only represents our best guess based on what is known so far.So, what do we know about nightshade lectins?Tomato lectin is known to enter the blood stream relatively quickly in humans, which suggests that tomato lectin can contribute to the development of a leaky gut 2.This information has led me to recommend that tomatoes should be eaten in moderation for most people.People with autoimmune disease are more likely have a leaky gut and have more challenges to healing a leaky gut once it has developed.For these sensitive individuals, tomato lectin should be avoided.

Nightshades contain saponins.The flowers, fruit, and foliage of the nightshade family contain a type of saponin called glycoalkaloids (e.g.the α-solanine and α-chaconine in potato, α-solanine in eggplant, and the α-tomatine in tomato) and contain steroidal drugs (e.g. the stimulating capsaicin in peppers, the tranquilizing nicotine in tobacco)3.I explained in detail how saponins can contribute to a leaky gut in this post (also see reference 4).Very importantly for those with autoimmune conditions, saponins, such as α-tomatine, have adjuvant activity.An adjuvant is a chemical that stimulates and exaggerates an immune response.The glycoalkaloid α-tomatine is such a potent adjuvant that it is used in vaccines to ensure that the recipient develops immunity against the virus they are being inoculated against.This is critical in the discussion of autoimmune disease because dietary saponins are believed to rev up the immune response to proteins leaking out of the gut 5.When antibodies are formed against proteins (like gluten) that have amino acid sequences that look very similar to sequences of other normal proteins (like transglutaminase) in the human body, the chances of developing an antibody against one’s self increases.When this happens, the immune system attacks normal healthy proteins/cells in your own body and this is the development of autoimmunity.Beyond these actions of saponins, glycoalkaloids inhibit a key enzyme, acetyl cholinesterase, which is required for nerve impulse conduction.There is also evidence that diets high in potatoes, in particular, result in increased markers of inflammation (this could also be due to the carbohydrate load that potatoes provide and not an effect of the glycoalkaloids themselves).Glycoalkaloid poisoning can occur with excessive consumption of nightshade vegetables, and many researchers have hypothesized that the low level toxic exposure from more moderate consumption of nightshades can contribute to a variety of health conditions 1.Another problematic substance is capsaicin, a steroidal stimulant found in chili peppers (it is one of the substances in peppers that give them heat).While a variety of health benefits have been attributed to capsaicin, it is also a potent irritant to a variety of tissues, including skin, eyes and mucous membranes.Very importantly, there is evidence that capsaicin can increase intestinal permeability 6.

Of all the foods restricted on the paleo diet autoimmune protocol, nightshades are the least likely to be reintroduced successfully.In fact, many people are sensitive to nightshades independent of illness or autoimmune issues.In my own experiences, two meals (on two consecutive days) containing a small amount of tomatoes nearly two months ago resulted in a massive lichen planus flare (it was also timed with some stressful life events, which I’m sure didn’t help).Two meals of tomatoes set me back months in my recovery.I am only in the last week or two starting to see some improvement to the new lesions that formed nearly overnight.While frustrating, I try and focus on the positive:I now know that tomatoes are not good for me.And avoiding them is worth it.

1 Childers N.F., and Margoles M.S. “An Apparent Relation of Nightshades (Solanaceae) to Arthritis” Journal of Neurological and Orthopedic Medical Surgery (1993) 12:227-231

2 Carreno-Gómez B et al. “Studies on the uptake of tomato lectin nanoparticles in everted gut sacs.” Int J Pharm. 1999 Jun 10;183(1):7-11.

3 Gee JM, et al “Effects of saponins and glycoalkaloids on the permeability and viability of mammalian intestinal cells and on the integrity of tissue preparations in vitro.” Toxicol In Vitro. 1996 Apr;10(2):117-28.

4 Francis G et al.“The biological action of saponins in animal systems: a review.” Br J Nutr. 2002 Dec;88(6):587-605.

5http://video.google.com/videoplay?docid=-8901290975296745403

6 Jensen-Jarolim E et al. “Hot spices influence permeability of human intestinal epithelial monolayers.” J Nutr. 1998 Mar;128(3):577-81.