Irritable Bowel Syndrome is Treatable


For many years, Irritable Bowel Syndrome (IBS) has been thought of as a condition that is stress related and can only be managed with drugs that reduce symptoms. But most cases of IBS are caused by an infection in your small intestine, known as Small Intestinal Bacterial Overgrowth (SIBO). This can be diagnosed with a Glucose or a Lactulose Hydrogen/Methane Breath Test that we can prescribe for you. Up to 84% of patients with IBS have been shown to test positive for SIBO with a lactulose breath test.(1)


However, IBS is usually treated as a condition with no known cause that can only be treated with drugs that reduce symptoms, like constipation or diarrhea.  Medications for constipation are many and can include magnesium, MiraLax, stimulant laxatives like Senokot, and other medications like Linzess and Amatiza. Medications for diarrhea include calcium, charcoal, Imodium, Lomotil, bile acid binding agents like cholestyramine, and also Lotronex, among others. But these medications do not attempt to correct the underlying causes of the symptoms.

After carefully going through your health history and doing a breath test and a stool sample, we can hopefully find the underlying cause of your symptoms and correct that. Occasionally other testing, such as food sensitivity testing can be very helpful. If you test positive for SIBO/IBS, this can be effectively treated in many patients with a special dietary regimen, natural, herbal anti-microbials and a few other nutritional strategies, including specific probiotics. There are certain prescription antibiotics that can also be very effective, but some of the herbal anti-microbials that have been shown in studies to be as effective as the antibiotics, and these are usually safer.(2)  If you choose to go with antibiotics, I will refer you to a gastroenterologist.  For an effective treatment, we must also restore proper intestinal motility, which can be accomplished nutritionally as well, as long as there are no structural barriers. Unfortunately, not everyone is better after the first month of care. An additional round may be necessary, perhaps with a different choice of herbs. We may need to change the dietary approach as well. Sometimes another type of diet is necessary, such as a few weeks of the elemental diet.

After phase one of our treatment, which is to Remove the overgrown bacteria and restore the intestinal motility, we then need to Rebuild our intestinal health using certain other nutritional strategies. This Rebuild is the second phase and is necessary in reducing the likelihood that it will return. We also need to broaden our nutrition out from the specialized diet we have been following while trying to eradicate the SIBO. This should be done in a gradual manner, checking to see if any of these foods create a reaction.  A percentage of patients continue to have some symptoms and may want to repeat the breath test and possibly repeat a cycle of care every so many months or may do well with a low dose of herbs on a daily basis. But there is a good chance that we will be able to identify the underlying cause of your discomfort and correct that, rather than just treating your symptoms.


Fish Oil Supplements Help Stabilize Chronic Kidney Disease

Patients with both diabetes and coronary artery disease often develop chronic kidney disease. Increasing levels of a protein, albumin, in the urine is one of the key indicators of the development and progression of chronic kidney disease. This is referred to as albuminuria. Normal, healthy kidneys filter out large protein molecules and do not allow them to pass into the urine. The presence of albumin in the urine is an indicator of improperly functioning kidneys. This is best measured by looking at the albumin to creatinine ratio (ACR) in the urine. 

72.3% of patients with diabetes and coronary artery disease saw an increase in their ACR over a one year period, meaning that they had a decline in their kidney function. Only 63.3% of those patients who were treated with either an angiotensin-converting enzyme-inhibitor (ACE) or angiotensin-receptor blocker (ARB) (both types of blood pressure medications) experienced an increase in their albumin to creatinine ratio.  However, those patients with both diabetes and coronary heart disease who took fish oil (2.3 gm of EPA and DHA) had no change in their ACR.  In fact, not only did these patients not see a decline in their kidney function, some of the patients who took fish oil saw an improvement in their kidney function via a decrease in their ACR, whereas none of the patients who took ACEs or ARBs saw such a reversal.  

My interpretation of this paper is that fish oil essentially reduced to zero the likelihood that patients with both coronary artery disease and diabetes would progress to chronic kidney disease, at least over a one year period, which patients taking the drugs that are the current standard of care–ACEs or ARBs did not experience. In fact, some of these patients saw an improvement of kidney function, which the blood pressure meds were unable to accomplish.  If this is not enough to demonstrate a significant benefit of fish oil supplementation, then I don’t know what is.  If fish oil was a prescription drug, it would become a billion dollar drug.


Elajami TKAlfaddagh ALakshminarayan D, et al..  Eicosapentaenoic and docosahexaenoic acids attenuate progression of albuminuria in patients with Type 2 Diabetes Mellitus and Coronary Artery Disease.

Statins (cholesterol lowering drugs) Not Effective for Those Over 65 Years Old

Statin drugs, such as Lipitor and Pravastatin, have been recommended to prevent heart attacks in patients with elevated cholesterol. Some cardiologists have touted the benefits ot these drugs and have even suggested putting it in the water supply.  When Pravastatin was tested on adults 65 years of age and older who had not had a prior heart attack but whom had LDL levels between 120 and 189 and whom also had hypertension, there was no preventative benefit.(1) The drug was given to them to prevent them from getting heart disease, but it was ineffective. For those adults 75 years of age or older, there was a slight increase in all cause mortality.

Most of the research indicates that statin (cholesterol lowering) medications are either of no preventative benefit or of very little benefit for most patients. But older individuals are more liable to suffer side effects from these medications, including a decline in physical and mental function, as the authors of this paper point out in the discussion section. Older adults are at increased risk of muscle problems from taking statins. Statins may also have cause fatigue with exertion and a loss of cognitive function.(2) Such effects can make older individuals less active, which can result in a negative impact on their health. Based on my reading of the studies, unless they have had a prior heart attack or stroke, older individuals probably should not take statins, but this decision should be made by you and your primary MD or your cardiologist.

If you want to lower your cholesterol levels naturally without taking statins, speak to Dr Weitz about a heart healthy nutrition program and some natural supplements that will not have the same downside as statins. These could include niacin, plant sterols, red yeast rice, tocotrienols, panthenol, berberine, hops, and vitamin K2, among others. You should have a blood test called an advanced lipid profile, such as the cardiometabolic profile from Spectracell Labs that Dr. Weitz can send you for, and then see Dr. Weitz for a nutrition consultation to map out a nutrition and lifestyle plan for you.



1. Han BH, Sutin D, Williamson JD, et al. Effect of Statin Treatment vs Usual Care on Primary Cardiovascular Prevention Among Older Adults: The ALLHAT-LLT Randomized Clinical Trial. JAMA Intern Med. 2017;177(7):955-965.
2. Golomb BA, Evans MA, Dimsdale JE, White HL. Effects of statins on energy and fatigue with exertion: results from a randomized controlled trial. Arch Intern Med. 2012; 172(15): 1180-1182


Response to American Heart Association Paper that Saturated Fat and Coconut Oil are Bad

You’ve probably seen the headlines like “Coconut Oil is Actually Terrible For You” that were seen after the American Heart Association (AHA) paper was published in the medical journal, Circulation, on June 15, 2017 that argues that saturated fat is the cause of heart disease. Most of these newspaper and magazine articles refer to the new study that presents this new evidence. But there is no new study!  All that happened is that these American Heart Association doctors published what amounts to an opinion piece based on old research.  After reviewing what they consider the four most important studies, all from the 1960s, they conclude that heart disease is caused by consuming foods with saturated fats, like meat, cheese, and coconut oil, and the answer is to substitute vegetable oils, like corn, soybean, and canola oil.

These doctors do not present any new evidence to support this older theory that our focus with diet should be to avoid saturated fats, like butter, cheese, red meat, and coconut oil and we should substitute polyunsaturated vegetable oils like soybean and corn oil. But these studies from the 1960s have problems with them, including that when you substitute vegetable oils, like soybean oil that are very high in omega 6 fats, you get an increased rate of death from cancer. This is because omega 6 fats promote inflammation. Thus, while the Los Angeles Veteran’s trial, one of their 4 core studies, showed lower rates of death from heart disease, there was actually no lower rate of death because the increased rate of death from cancer and other diseases made up for it.

The American Heart Association also ignored the recently published Minnesota Coronary Experiment that was conducted 40 years ago but was just recently published that found that for every 30 mg/dL reduction in serum cholesterol resulted in a 22% higher risk of death.  And the AHA also dismissed several meta-analyses that have been published recently that demonstrate that there is no association between saturated fat intake and heart disease or stroke.

The AHA conclusion that coconut oil is unhealthy is based on the fact that it contains mostly saturated fats, which they claim are the primary cause of heart disease through raising LDL levels. As I mentioned, saturated fat intake if it is part of a high carbohydrate diet, esp. processed carbs, can increase atherosclerosis risk, but if part of a healthy, low glycemic program, coconut oil does not increase heart disease risk.  While coconut oil is mostly saturated fat, the primary saturated fat is lauric acid, which is directly absorbed by intestinal enterocytes and may prevent fat deposition in blood vessels.

 Further, there are quite a number of proven benefits of coconut oil, including that it is a good, high heat cooking oil, it was shown in several studies to help with weight loss, it raises HDL levels (the “good” cholesterol), and improvements in cognitive function, including in patients with Alzheimer’s Disease. I’m still using my coconut oil to cook my eggs and on my roasted vegetables.  It is a much better choice than to use soybean oil.  If you want to modify your diet and lifestyle to put you on a path that lowers your risk of heart disease, make an appointment with Dr. Weitz for a Functional Nutrition consultation.

Broccoli Prevents Cancer

Broccoli Prevents Cancer


In the Journal of Nutritional Biochemistry, a new study shows that sulforaphane from broccoli may have a positive impact on genetics and prostate cancer risk.(1)  Prostate cancer is the second leading cause of death in men in the US and more targeted preventative strategies are needed.

What is sulforaphane? Sulforaphane is a major phytochemical found in cruciferous vegetables such as broccoli, cauliflower, cabbage, kale, brussel sprouts, radishes and others.  The highest concentration is found in broccoli sprouts.  Sulforaphane is formed when an enzyme myrosinase helps to break down glucoraphanin, a glucosinolate, into sulforaphane during the chewing phase of digestion.

Phytochemicals like sulforaphane can act as a protectant to our cells.  It’s a cell’s primary defensive system.  Sulforaphane has been shown in other research to have anticancer effects.(2) So far, sulforaphane has been shown to exert it’s positive effects through the activation of Nrf2 signaling pathway.(3) This study provides another pathway through which sulforaphane exerts its potent cancer protective effects.

The recent paper mentioned above explains that researchers recognized a pathway where sulforaphane can affect long, non-coding RNAs. Ribonucleic acids (RNA) are long molecular chains responsible for transmitting genetic material.  RNAs are crucial for cellular growth and can be negatively expressed, which can trigger chronic diseases like cancer.

Ingesting sulforaphane positively expresses your genes by decreasing the long non-coding RNA four fold, thereby normalizing it during upregulation in prostate cancer, possibly preventing the progression of cancer and in some cases preventing it altogether.  It turns out that the current kale craze may not be so crazy after all.  Or maybe we are going to see a broccoli sprouts craze! Break out your gas mask.

You should include cruciferous vegetables like broccoli and kale in your daily diet and you should also consider adding a sulforaphane supplement from broccoli sprouts.  Most broccoli sprout supplements contain glucoraphanin, but this still has to be converted by the body into sulforaphane.  Metagenics has developed a nutraceutical product called SulforaClear that not only contains 204 mg of the powerful phytochemical, sulforaphane, but it also contains the myrosinase enzyme, derived from the broccoli florets, which facilitates the production of the active ingredient in the body.   Sulforaphane should be part of your anti-cancer regimen, esp. if you have a family history or a genetic profile that increases your cancer risk.



  1. Beavera LM, Kuintzlec R, Buchanan A, et al. Long noncoding RNAs and sulforaphane: a target for chemoprevention and suppression of prostate cancer. Journal of Nutritional Biochemistry 42 (2017) 72–83.
  2. Zhang Y, Talalay P, Cho C, Posner G. A major inducer of anticarcinogenic protective enzymes from broccoli: Isolation and elucidation of structure. Proc. Natl. Acad. Sci. 1992; (89), 2399-2403.



Removing Toxins With Proper Liver Support

Our modern world is awash in toxins, including heavy metals (lead, mercury, cadmium, arsenic), herbicides, pesticides, teflon pans, BPA from plastic, pthalates and sodium laurel sulfate in personal care products, flame retardant chemicals found in furniture, chlorine, flouride, and ammonia added to our drinking water, chemicals from paints and other building materials, etc..

Many of these toxins become stored in our fatty tissues. In order to remove stored toxins, your body needs to convert these fat soluble chemicals into water soluble ones that can be excreted through the stool, urine, or sweat. This process occurs primarily in the liver, so you need to conduct a proper liver detoxification program. This can be done by providing specific nutritional support for both Phase I and Phase II enzymes of the liver detoxification process. Phase I is conducted by the cytochrome P450 family of enzymes that take the fat soluble toxins and add a reactive group as part of the detoxification process. These reactions include oxidation, reduction, and hydrolysis.  If you can drink several cups of coffee in the afternoon or evening and sleep fine, then your phase I enzymes are likely overactive. The Phase I enzymes actually temporarily creates more reactive molecules that, if not converted fully into water soluble metabolites by Phase II, could lead to detoxification reactions, such as headache, brain fog, stomach aches, constipation or diarrhea, skin breakouts, fatigue and low energy, sleep problems, irritability, and congestion. This is why a juice fast is not as effective as using specific nutrients that support Phase II of liver detoxification.

Phase II of liver detoxification is crucial for proper removal of toxins from the body and a juice fast is liable to lead to depressed phase II enzymes, since amino acids are important nutrients for this phase and juices contain no amino acids. Phase II of liver detoxification is also known as the conjugation phase, since these toxins are congugated or combined with another substance, such as cysteine, glycine, or a sulfur molecule to make it water soluble, so it can be excreted from the body.  A proper detoxification program should include phase II supportive nutrients, such as amino acids like glutamine, glycine, and sulfur containing amino acids like taurine and cysteine.  It should also include cruciferous vegetables, like broccoli and watercress.  Likewise, it is important that you have a daily bowel movement so that toxins in the stool get eliminated, so support for the digestive tract such as probiotics or magnesium supplements as a stool softener may be indicated.  In addition, drinking a lot of water to support the kidneys and urine flow and sweating is important, since these are other routes for toxin removal.  Speak to Dr. Weitz for help with nutritional support for detoxification and consider attending the free detoxification that Dr. Weitz is giving in the office on February 2 Thursday at 6pm.  Call the front desk for more information or to add your name to the list.

Main reference: Hodges R, Fitzgerald KN The Detoxification Module of The Clinical Nutrition Series from The Board for Certification of Nutrition Specialists from the MHICN

Omega 3, Vitamin D, and Resveratrol Supplements May Benefit Preclinical Alzheimer’s Disease

Alzheimer’s Disease is a neurodegenerative disease where the patient experiences progressive loss of normal brain function and it is the cause of 60 to 70% of cases of dementia. After the diagnosis of Alzheimer’s Disease, the average patient only lives 3 to 9 years, so treatments to slow down the progression or reverse the condition are sorely needed. Alzheimer’s Disease is marked by plaques that build up in the brain that contain abnormally folded Amyloid beta (A beta) protein. If the body is not able to clear these proteins out of the brain, they build up and lead to deterioration of brain function.

UCLA neurologists, including Dale Bredesen, found that supplementing preclinical patients with Alzheimer’s Disease with an Omega 3 drink that also contained vitamin D and resveratrol was beneficial. These patients, with mild cognitive impairment, experienced an increase in the breakdown (phagocytosis) of the neurotoxic molecule, amyloid Beta. Therapies that promote clearance of this molecule have been the focus of much research on Alzheimer’s.

In patients with mild clinical impairment and pre-mild clinical impairment who took the omega 3, vitamin D and reveratrol, phagocytosis of amyloid-beta by monocytes increased from 530 to 1306 mean fluorescence intensity units. Unfortunately, once the patients already had Alzheimer’s Disease, it did not help that much. The lipidic mediator resolvin D1, which stimulates amyloid-beta phagocytosis in vitro, increased in macrophages in 80% of patients with mild clinical impairment and pre-mild clinical impairment.

Omega 3 fatty acids both reduce inflammation and through the formation of Specialized Pro-Resolving Mediators (SPM), which have been shown to resolve inflammation, protect organs, and stimulate tissue regeneration.(2) According to these UCLA neurologists, “SPMs from omega-3s are known to terminate acute inflammation, increase phagocytosis, and have distinct roles in attenuating chronic inflammation and, thus, appear suitable for repairing defective Ab phagocytosis and regulating inflammation in patients with Alzheimer’s Disease. Interestingly, the Alzheimer’s Disease brain was found to have defective SPMs in the hippocampus.”

Readers should keep in mind that this was a small study and such results are interesting, but by no means are definitive without larger studies. It is also interesting to consider that SPMs are now available as separate supplements from Metagenics and sold at our office. I recommend supplementing with both omega 3 fats from fish oil capsules as well as SPMs to further protect brain tissue from possible deterioration with autoimmune diseases (like Alzheimer’s and Parkinson’s) or degenerative diseases (like senile dementia). Speak to Dr. Weitz about this. Also, we can help you get tested for the ApoE gene that tells you whether you are at higher risk for this condition.

1. Fiala M, Halder RC, Sagong B, Ross O, Sayre J, Porter V, Bredesen DE. “[Omega]-3 Supplementation increases amyloid-[beta] phagocytosis and resolvin D1 in patients with minor cognitive impairment.” FASEB J. 2015 Jul;29(7):2681-9.
2. Spite, M., Claria, J., and Serhan, C. N. (2014) Resolvins, ` specialized proresolving lipid mediators, and their potential roles in metabolic diseases. Cell Metab. 19, 21-36.

Calcium Supplements Do Not Cause Heart Disease

I was very skeptical of the studies that seemed to show that taking calcium supplements or consuming calcium would lead to calcium buildup in the arteries and contribute to heart disease. Calcium is an essential mineral in the body that is essential in cellular metabolism as a signaling molecule and important for the strength of our teeth and bones, and most Americans are lacking adequate levels. I discussed this in a video recorded 3 years ago. watch video here But at the time, several studies were published that seemed to show that excessive calcium intake, esp. from supplements, would get deposited in the arteries and contributed to atherosclerosis and heart disease.(1,2,3,4) This led many doctors to stop recommending calcium supplements. I think this was a great disservice to many patients who needlessly lost bone mass because of this advice. Let’s not forget the significance of osteoporosis and osteopenia in the US. Over 54 million Americans suffer with bone loss and one in two women and one in four men over the age of 50 will break a bone related to osteoporosis, according to The National Osteoporosis Foundation. The US spends 19 billion dollars per year for health care costs related to such fractures.

There is no physiological reason why simply having more calcium would lead to it getting deposited in the arteries. It is oxidized lipids in the presence of inflammation in the arterial walls that results in plaque formation. There is always sufficient calcium in the blood stream to form plaques and increasing the amount of calcium is unlikely to play any role in this process. Granted, there are negative effects of overconsuming poorly absorbable forms of calcium, such as the calcium carbonate found in Tums, resulting in Milk Alkali Syndrome (5) Equally important is that the patient consume optimal levels of magnesium, vitamin D3, and vitamin K, preferably MK7, to facilitate the utilization of the calcium and bone formation. Further, in patients with normal kidney function, the body is able to excrete a reasonable amount of excess calcium fairly easily without consequence.

Recently a review and meta-analysis published in the Annals of Internal Medicine concluded that “Calcium intake within tolerable upper intake levels (2000 to 2500 mg/d) is not associated with CVD risk in generally healthy adults.” In fact, with the highest calcium intake (greater than or equal to 1453 mg daily) compared to the lowest intake (less than 434 mg), there was a 27% decreased risk of coronary artery calcium, that is, in the amount of atherosclerotic plaque formation in their arteries. This led the American Society for Preventative Cardiology and the National Osteoporosis Foundation to conclude that calcium supplements in dosages up to 2500 mg/day do not increase the risk of heart attacks, strokes or cardiovascular disease.(6,7) The authors of this paper did separate out the supplement users from the calcium from food and did see some increase CVD from supplements but not from food. However, this was with smaller supplement amounts and not with larger amounts of supplements, which really doesn’t make any sense. And once again, those subjects who had the largest intake of calcium from a combination of food and supplements had a lower risk, so it is hard to understand how taking supplements, unless they were of very poor quality, could pose any risk. My conclusion from this and the other studies is that reasonable amounts of quality calcium supplements are safe and do not contribute to heart disease. To make sure the calcium is utilized by the body for bone formation and its other functions, make sure to take a quality form like calcium citrate, malate, or hydroxyapatite, and take it with magnesium, vitamin C, vitamin D3, and vitamin K2-MK7 and keep your total intake from both food and supplements under 2500 mg/day.


1. Bolland MJ, Avenell A, et al.. Effect of calcium supplements on risk of myocardial infarction and cardiovascular events: meta-analysis. BMJ. 2010;341:c3691.
2. Bolland MJ, Grey A, Avenell A, Gamble GD, Reid IR. Calcium supplements with or without vitamin D and risk of cardiovascular events: reanalysis of the Women’s Health Initiative limited access dataset and meta-analysis. BMJ. 2011;342:d2040.
3. Reid IR, Bristow SM, Bolland MJ. Cardiovascular complications of calcium supplements. J Cell Biochem. 2015;116:494–501.
4. Xiao Q, Murphy RA, Houston DK, et al. Dietary calcium and supplemental calcium intak and cardiovascular disease mortality: The National Institutes of Health—AARP diet and health study. JAMA Intern Med. 2013;173(8):639-46.
5. Felsenfeld AJ, Levine BS. Milk alkalai syndrome and the dynamics of calcium homeostasis. Clin J Am Soc Nephrol; 2006. 1(4):641-54.
6. Chung M, Tang AM, Fu Z, Wang DD, Newberry SJ. Calcium Intake and Cardiovascular Disease Risk: An Updated Systematic Review and Meta-analysis. Ann Intern Med. [Epub ahead of print 25 October 2016] doi: 10.7326/M16-1165
7. Kopecky SL, Bauer DC, Gulati M, et al. Lack of evidence linking calcium with or without vitamin D supplementation to cardiovascular disease in generally healthy adults: A clinical guideline from the National Osteoporosis Foundation and the American Society for Preventive Cardiology. Ann Intern Med. [Epub ahead of print 25 October 2016] doi: 10.7326/M16-1743
8. Nutrition Action Newsletter, December 2016.

How to Avoid a Food Hangover on Thanksgiving

Of course, Thanksgiving is a time to give thanks and enjoy a good meal. But that’s no reason to eat yourself to oblivion to where you can barely move for hours and to where you have a food hangover. So here are some common sense tips for under-indulging yourself and making your Thanksgiving day healthier:

1. Make sure to have a healthy breakfast to start the day. Don’t go into your Thanksgiving meal starving.
2. Go to the gym or do some exercise in the morning if possible. Maybe plan a soccer or basketball game with the kids early in the day.
3. For before dinner snacks, go for the veggies and dip or salad if available.
4. Fill 1/4 of your plate with turkey. Fill 1/2 your plate with as many veggies as possible–brussel sprouts, green beans, carrots, etc. Fill the last 1/4 of your plate with the rest of the goodies–sweet potatoes, etc. But only have one plate.
5. Eat slowly and savor every bite of food. Place your fork down between bites.
6. Let yourself have one glass of wine or other beverage. Have at least one glass of water prior to starting dinner to reduce your appetite
6. Let yourself have one small slice of pie, but no more.
7. Consider getting some family members to go out for a walk after dinner.

Healthy Thanksgiving Side Alternatives

Cranberry Sauce with Apricots, Raisins, and Orangecranberry-sauce

Prep Time: 10 Minutes
Cook Time: 15 Minutes
Ready In: 8 Hours 25 Minutes
Servings: 24

“Dried apricots are a great addition to this holiday favorite!”

1 cup orange juice
1 cup water
4 cups fresh cranberries
3/4 cup sugar
1 cup chopped dried apricots
1 cup golden raisins
1 tablespoon grated orange zest

In a large saucepan over medium heat, mix the orange juice, water, cranberries, sugar, apricots, raisins, and orange zest. Stir constantly until sugar has dissolved, about 5 minutes. Bring to a boil, and cook 10 minutes, or until cranberries have burst. Remove from heat, and chill at least 8 hours, or overnight, before serving cold.

Baked Sweet Potatoes with Ginger and Honey

Prep Time: 15 Minutes
Cook Time: 40 Minutes
Ready In: 55 Minutes
Servings: 12
“Fresh ginger, cardamom, and sweet potatoes will fill your house with a fall fragrance as well as call your family to the table. Originally submitted to”
3 pounds sweet potatoes, peeled and
1/2 cup honey
3 tablespoons grated fresh ginger
2 tablespoons walnut oil
1 teaspoon ground cardamom
1/2 teaspoon ground black pepper


Preheat oven to 400 degrees F (200 degrees C).
In a large bowl, toss together the sweet potatoes, honey, ginger, walnut oil, cardamom, and pepper. Transfer to a large cast iron frying pan.
Bake for 20 minutes in the preheated oven. Stir the potatoes to expose the pieces from the bottom of the pan. Bake for another 20 minutes, or until the sweet potatoes are tender and caramelized on the outside.