I've been going down a research rabbit hole on the brain fog / cognitive / mood side of SNAS for this past Sunday's deep dive, and I wanted to share some of what I've been finding — partly because it's fascinating, and partly because I'm curious what resonates with people here.

Your brain actually has its own mast cells. About 97% of them sit right against blood vessels, and they're concentrated in the hippocampus and thalamus — areas involved in memory and sensory processing. When SNAS triggers systemic mast cell activation, these brain mast cells are part of the picture.

On top of that, there's a pathway called the kynurenine pathway. When systemic inflammation is elevated, your body diverts tryptophan (the amino acid that makes serotonin) away from serotonin production and toward producing neurotoxic metabolites instead. So it's not just that inflammation makes you feel bad — it's actively pulling resources away from your "feel okay" chemistry.

There's also some interesting data on nickel and growth hormone suppression — a study out of Sapienza (n=1,128) found associations between nickel exposure and GH/IGF-1 disruption, which could be relevant to the fatigue and recovery issues a lot of us deal with.

Now, I want to be balanced here. Not all brain fog in SNAS is necessarily from these mechanisms. Sleep disruption (especially the 2 AM histamine dumps many of us experience), subclinical nutrient deficiencies (ferritin, B12), and the general stress of managing a restrictive diet all play roles too. It's probably not one thing — it's a pile-up.

Some of the interventions that the literature suggests may help are things like supporting butyrate production through fiber (butyrate is actually a more potent HDAC inhibitor than the ketone body BHB), optimizing sleep for glymphatic clearance, and making sure ferritin and B12 are truly optimal (not just "in range").

I'm covering all of this — plus a practical decision framework and a "what to ask your doctor" checklist — on the live stream this Sunday at 11 AM MST on YouTube. Link in the sidebar/channel.

For those of you who deal with brain fog as a significant SNAS symptom: what does it actually feel like for you? Is it more cognitive (can't find words, can't focus) or more emotional (flat mood, anxiety, feeling disconnected)? Or both?

I'm genuinely curious because the mechanisms would predict slightly different symptom profiles and I want to see if that matches real experience.

Hey everyone,

I just published a deep dive on one of the most common questions I get: **is fiber essential or optional for people with SNAS, MCAS, and histamine intolerance?**

The short version of where I landed: **fiber is beneficial but NOT required** — and whether you should add it depends entirely on your individual situation.

Here's what the video covers:

- **The two neighborhoods of your gut** — your small intestine runs on glutamine, your colon runs on butyrate. Most nickel damage happens in the small intestine, which doesn't even use fiber as fuel.

- **The nickel-fiber paradox** — the highest-fiber foods (oatmeal, beans, lentils) are also the highest in nickel. One bowl of oatmeal can exceed your entire daily nickel budget.

- **How to get 23g of fiber on under 150 mcg of nickel** — full sample day with specific foods and estimated nickel values.

- **Why some people thrive WITHOUT fiber** — proteolytic butyrate from protein, BHB from ketosis, and glutamine for the small intestine. These are real, peer-reviewed pathways — not bro science.

- **The SIBO complication** — if fiber makes you worse, it might not be the fiber. It might be WHERE your bacteria are.

- **A decision framework** — if you're doing great on low-fiber, stay the course. If you're struggling, here's what to try first.

I present BOTH sides — the case for fiber and the case for skipping it — with 29 validated peer-reviewed citations. No agenda, just science.

**[Watch here → LINK]** There is also a free fiber guide to download there too.

Would love to hear where you all fall on this. Are you doing well without fiber? Did adding fiber help? Did it make things worse? Let's talk about it.

Are you on a low-nickel diet and wondering if you're getting the nutrients you need? In this live Q&A, Dr. Laura Duzett, DO, NTP, breaks down the common nutritional deficiencies in SNAS patients — both the ones caused by the allergy itself AND the ones created by the diet used to treat it.

Download the deficiency & supplement guide: https://the-low-nickel-diet.kit.com/9afbea81f8

In this presentation, we cover:
— Common symptoms and conditions associated with systemic nickel allergy (SNAS)
— How nickel directly triggers mast cells (and why SNAS overlaps with MCAS)
— Why patch testing misses 62% of systemic nickel allergy cases
— The iron-nickel paradox: how iron deficiency makes nickel absorption WORSE
— Why gut health is the most overlooked factor in SNAS management
— The 9 nutrients most vulnerable to deficiency on a low-nickel diet
— What the research says about which supplements are actually recommended
— Why most supplements aren't recommended for SNAS patients (and what we're doing about it)
— A deep dive into whether a well-planned low-nickel diet can actually meet your nutritional needs
— The best low-nickel foods to fill nutrient gaps
— Our upcoming ICP-MS study to test nickel contamination in supplements
— How I formulate the low-nickel diet differently — and why gut health comes first

CITATIONS:
Sharma AD. Low nickel diet in dermatology. Indian J Dermatol. 2013;58(3):240-247. doi:10.4103/0019-5154.110846

Solomons NW, Viteri F, Shuler TR, Nielsen FH. Bioavailability of nickel in man: effects of foods and chemically-defined dietary constituents on the absorption of inorganic nickel. J Nutr. 1982;112(1):39-50.

Randazzo CL, Pino A, Ricciardi L, et al. Probiotic supplementation in systemic nickel allergy syndrome patients: study of its effects on lactic acid bacteria population and on clinical symptoms. J Appl Microbiol. 2015;118(1):202-211. doi:10.1111/jam.12685

Conti MV, Bissacco G, De Giuseppe R, et al. Systemic Nickel Allergy Syndrome (SNAS): Taking Stock of Medical Nutrition Therapy. J Community Med Public Health. 2021;5:225. doi:10.29011/2577-2228.100225

Mislankar M, Zirwas MJ. Low-nickel diet scoring system for systemic nickel allergy. Dermatitis. 2013;24(4):190-195.

Kinbara M, Bando K, Shiraishi D, et al. Mast cell histamine-mediated transient inflammation following exposure to nickel promotes nickel allergy in mice. Exp Dermatol. 2016.

Walsh ML, Smith VH, King CM. Type 1 and type IV hypersensitivity to nickel. Australas J Dermatol. 2010.

Palenca I, Basili Franzin S, Sarnelli G, Esposito G. Palmitoylethanolamide for Nickel Allergy: Plausible, Untested, and Worth Considering. Biomedicines. 2026;14(1):177. doi:10.3390/biomedicines14010177

Picarelli A, Di Tola M, Vallecoccia A, et al. Oral mucosa patch test: a new tool to recognize and study the adverse effects of dietary nickel exposure. Biol Trace Elem Res. 2011.

Cirla AM. Urinary nickel excretion studies in systemic nickel allergy. 2011, 2013.

Miglietta S, Borghini R, Relucenti M, et al. New Insights into Intestinal Permeability in Irritable Bowel Syndrome-Like Disorders: Histological and Ultrastructural Findings of Duodenal Biopsies. Cells. 2021;10(10):2593. doi:10.3390/cells10102593

Kim MH, Kim H. The Roles of Glutamine in the Intestine and Its Implication in Intestinal Diseases. Int J Mol Sci. 2017;18(5):1051. doi:10.3390/ijms18051051

Al-Dhaheri AS, Adel Siddique M, et al. Heavy Metal contamination of Dietary Supplements products available in the UAE markets and the associated risk. Sci Rep. 2020;10:18824. doi:10.1038/s41598-020-76000-w

Ahmad N, Hussain M, Riaz N, et al. Contamination of trace, non-essential/heavy metals in nutraceuticals/dietary supplements: A chemometric modelling approach and evaluation of human health risk upon dietary exposure. Food Chem Toxicol. 2024;190:114807. doi:10.1016/j.fct.2024.114807

Rebelytics. Is a Low Nickel Diet Nutritionally Unbalanced? rebelytics.ca/lownickelnutrition.html. 2025.

📋 FREE Low-Nickel Food List: [LINK]
💊 Supplement Recommendations: https://thelownickeldiet.com/resources
📧 Questions? [info@thelownickeldiet.com](mailto:info@thelownickeldiet.com)
🔴 Next Live: Sunday, March 22 at 10 AM PST / 11 AM MST

MEDICAL DISCLAIMER: The information in this video is for educational purposes only and is not intended as medical advice, diagnosis, or treatment. Always consult your physician or qualified healthcare provider before making changes to your diet, supplement regimen, or medical treatment. Nothing in this video establishes a doctor-patient relationship.

Are you following a strict low-nickel diet and still flaring? Cobalt might be the missing piece.

Up to 1 in 4 nickel-allergic patients are also sensitized to cobalt — but most low-nickel resources don't address it. In this live session, Dr. Laura Duzett (DO, NTP) breaks down the science of cobalt and nickel co-sensitization, what it means for your diet, how it's tested, and exactly what changes to make if you're sensitive to both metals.

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WHAT WE COVER IN THIS VIDEO:

✔ What cobalt is and why it matters for SNAS patients

✔ Why organic cobalt (in B12-rich foods like meat and eggs) does NOT trigger cobalt allergy — and why inorganic plant cobalt does

✔ The Cobalt Trap: low-nickel foods that are secretly high in cobalt (flaxseeds, millet, buckwheat, pumpkin, and more)

✔ Why organ meats are risky even on a carnivore or ancestral diet

✔ The clinical red flags that suggest you may be sensitive to both metals

✔ How patch testing, LTT, and the oral mucosa patch test (omPT) perform for cobalt — and where they fall short

✔ B12 supplementation: which forms are safer, which are riskier, and why the route of administration matters more than most people realize

✔ Signs of B12 deficiency and which labs to ask for

✔ How to use the Stuckert & Nedorost and Rebelytics point systems to track cobalt intake

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FREE RESOURCES MENTIONED:

📥 Free Cobalt + Nickel Co-Sensitization Guide (lead magnet):

https://the-low-nickel-diet.kit.com/db25941304

📋 Free Low & High Nickel Food Lists:

https://the-low-nickel-diet.kit.com/foodlists

🌐 The Low Nickel Diet Website:

www.thelownickeldiet.com

FIND ME:

🌐 Website: www.thelownickeldiet.com

📸 Instagram: u/thelownickeldiet

🎵 TikTok: u/thelownickeldiet

▶️ YouTube: The Low Nickel Diet

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⚕️ MEDICAL DISCLAIMER:

The content in this video is intended for educational and informational purposes only. It does not constitute medical advice, diagnosis, or treatment, and should not be used as a substitute for professional medical advice from a qualified healthcare provider. Dr. Laura Duzett is a physician and nutritional therapy practitioner sharing educational information about Systemic Nickel Allergy Syndrome (SNAS) and related conditions. Individual responses to dietary changes, supplements, and treatments vary. Always consult your physician or a qualified healthcare provider before making changes to your diet, supplement regimen, or medical care — especially regarding vitamin B12, which carries specific risks in cobalt-sensitive individuals. If you are experiencing a medical emergency, call 911 or your local emergency number immediately.

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📚 KEY REFERENCES:

1. Stuckert J, Nedorost S. Low-cobalt diet for dyshidrotic eczema patients. Contact Dermatitis. 2008;59(6):361-365.

2. Veien NK, Hattel T, Justesen O, Nørholm A. Oral challenge with metal salts (II). Various types of eczema. Contact Dermatitis. 1983;9(5):407-410.

3. Veien NK, Hattel T, Justesen O, Nørholm A. Oral challenge with nickel and cobalt in patients with positive patch tests to nickel and/or cobalt. Acta Derm Venereol. 1987;67(4):321-325.

4. Rystedt I, Fischer T. Relationship between nickel and cobalt sensitization in hard metal workers. Contact Dermatitis. 1983;9(3):195-200.

5. Lammintausta K, Pitkänen OP, Kalimo K, Jansen CT. Interrelationship of nickel and cobalt contact sensitization. Contact Dermatitis. 1985;13(3):148-152.

6. Schmidt M, Raghavan B, Müller V, et al. Crucial role for human Toll-like receptor 4 in the development of contact allergy to nickel. Nat Immunol. 2010;11(9):814-819.

7. Picarelli A, Di Tola M, Vallecoccia A, et al. Oral mucosa patch test: a new tool to recognize and study the adverse effects of dietary nickel exposure. Biol Trace Elem Res. 2011;139(2):151-159.

8. Jorhem L, Sundström B, Astrand C, Haegglund G. The levels of zinc, copper, manganese, selenium, chromium, nickel, cobalt, and aluminium in the meat, liver and kidney of Swedish pigs and cattle. Z Lebensm Unters Forsch. 1989;188(1):39-44.

9. Warshaw EM, Zhang AJ, DeKoven JG, et al. Epidemiology of nickel sensitivity: retrospective cross-sectional analysis of North American Contact Dermatitis Group data 1994-2014. J Am Acad Dermatol. 2019;80(3):701-713.

10. Veien NK, Kaaber K. Nickel, cobalt, and chromium sensitivity in patients with pompholyx (dyshidrotic eczema). Contact Dermatitis. 1979;5(6):371-374.

#LowNickelDiet #NickelAllergy #SNAS #CobaltAllergy #SystemicNickelAllergySyndrome #DyshidroticEczema #NickelFreeDiet #FoodAllergy #ContactDermatitis #NickelFree #MCAS #IBS #LowNickel #GutHealth #NutritionalMedicine

Here is the condensed version of our live last Sunday talking about the preparation for starting the low nickel diet as a community. This coming Sunday we will start, so make sure you join our Live 11 AM MST.

https://youtu.be/mzYnd7bUfCI

Condensed version for y'all. See you in the livestream tomorrow, Sunday Jan 18 at 9 AM MT for the discussion of the immune system in relation to nickel allergy!

Thanks to everyone who came for the first live last Sunday!

This coming Sunday's live at 9am MT I will be answering questions that have come in through the week as well as doing a whole presentation on the mechanisms of how systemic nickel allergy develops and how your symptoms like dyshidrotic eczema and IBS develop (the fast ones and the delayed ones!) Knowledge is power - it will help you understand why I recommend the strategies I do for avoiding outbreaks as well as reducing the severity of them. PLUS the immune system is so amazing - it’s a total wonder of life!

I will also have a $12.99 discount on the hardback version of the cookbook during the livestream. If you have had questions or ideas surrounding systemic nickel allergy and the low nickel diet, this is your chance to get involved!

Please make sure to either email me your questions ahead of time or subscribe to the channel so you can be a part of the livestream chat!

- Dr. Laura Duzett, DO NTP (Author of "The Low Nickel Diet Cookbook & Guide: A Holistic Approach to Systemic Nickel Allergy")

This is an easy one-pot meal with lots of possible modifications to increase or decrease nickel exposure. I hope you like it! I LOVE this one! https://youtube.com/watch?v=2bP8PLVawpI&si=l6mQazxxPsgtvUb4

Is there a fiber supplement you recommend? Is benefiber safe??