A Tolerance Kitchen article.
The below content has been created with the input of a range of dietitians and sources. Following a low histamine diet should always be done alongside a qualified dietitian. Your own unique intolerances may make you more susceptible to certain foods than others, and long term adherence can lead to deficiencies in other important nutrients. You can find a list of trusted histamine dietitians here, all of whom offer 1:1 online sessions to help you get started and work with you to create a personalised diet.
The Problem with Soy Sauce and Tamari
Soy sauce is a cornerstone of many cuisines, adding a deep, savoury complexity that is difficult to replicate. Unfortunately for those with histamine intolerance, it presents a double challenge. Firstly, soy sauce is a fermented product. The long fermentation process used to create its signature flavour also creates very high levels of histamine. This directly adds to your ‘histamine bucket’, potentially causing it to overflow and trigger a reaction.
Secondly, soy itself is considered by some to be a histamine liberator. This means it may trigger your body’s own mast cells to release their stored internal histamine, further contributing to your overall load. Because it is both high in histamine and a potential liberator, soy sauce (and its gluten-free cousin, tamari) is one of the first things to be removed during the initial phase of a low histamine diet.
What Job is Soy Sauce Doing in Your Dish?
To find a good substitute, we first need to understand what soy sauce actually brings to a recipe. It is rarely just one thing, but a combination of three key elements:
- Umami: This is the deep, savoury, ‘fifth taste’ that adds richness and body to dishes. It’s the satisfying flavour you find in mushrooms, meats, and broths
- Saltiness: Soy sauce is intensely salty, which enhances all the other flavours in a dish
- Colour: It provides a rich, dark brown colour to marinades, glazes, and stir-fries
A successful swap needs to replicate at least two of these jobs, and you may need to combine ingredients to get the full effect.
The Best Low Histamine Soy Sauce Swaps
Here are our top recommendations for replacing soy sauce in your cooking. Remember to always check labels for sneaky additives like vinegar or yeast extract.
| Swap | What it Replicates | What You Lose | How to Adjust | Freshness Note |
|---|---|---|---|---|
| Mushroom Powder & Salt | Umami, saltiness | Liquid and colour | Use finely ground dried shiitake or porcini mushrooms. Mix with salt and a little hot water to create a liquid paste. |
Ensure your dried mushrooms are fresh and have been stored in an airtight container to avoid mould. Note: mushroom powder is rich in amines that can trigger reactions in severe HIT or MCAS cases. |
| Blackstrap Molasses & Salt | Colour, complex sweetness, saltiness | The specific umami flavour | Use very sparingly. A tiny amount mixed with salt and water provides a dark, rich liquid ideal for gravies or marinades. | A very stable pantry item. Check for sulphites if you are sensitive. |
| Coconut Aminos | Colour, mild umami, sweetness | Most of the saltiness and deep umami | Add extra salt to your dish. It is naturally sweeter than soy sauce, so you may need to reduce other sweet elements. | Buy in small bottles and use quickly. As a fermented product, it can develop histamine after opening. |
| DIY "No-Soy" Sauce | All three (umami, salt, colour) | Convenience (it's a high-effort swap) | There are many recipes online using ingredients like mushrooms, beef broth, and seasonings, boiled down to a concentrate. | As with any homemade preparation, this should be made in small batches and consumed fresh. |
Coconut aminos are often considered a replacement for soy sauce, especially as another gluten-free option. Coconut aminos are also a fermented product, so generally should not be recommended. If you do want to try these, ensure that you choose an unfermented, low-histamine brand.
The Swap Everyone Recommends (And Why You Shouldn't)
You will often see two products recommended as direct swaps for soy sauce: tamari and Worcestershire sauce. For someone on a low histamine diet, this is generally unhelpful advice.
Tamari is essentially soy sauce without the wheat. While this makes it a great gluten-free option, it is still made from fermented soy and is therefore just as high in histamine as regular soy sauce.
Worcestershire sauce is another flavour bomb from the UK condiment shelf, but its ingredients list is a minefield for histamine intolerance. It typically contains fermented anchovies, vinegar, and tamarind, all of which are on the ‘avoid’ list for a strict elimination diet.
If Your Bucket Has Room: The "Tolerate a Little" Tier
Histamine intolerance is highly individual. Once you have completed an elimination diet with a dietitian and have a good understanding of your personal thresholds, you may find you can tolerate a very small amount of a high-histamine ingredient without your bucket overflowing. For some, a tiny splash of high-quality, freshly opened tamari in a large dish might be manageable on a day when other triggers (like stress or pollen) are low.
Remember, a low histamine diet is not meant to be a life sentence. Once you've understood your body and your own unique reactions, histamine intolerance is about management rather than elimination. Through careful reintroduction alongside a healthcare professional, and some well-informed ingredient swaps in the kitchen, food can still be something to be enjoyed, rather than something to be feared.
This article is for informational purposes only and does not constitute medical advice. Please consult a qualified healthcare professional for advice specific to your situation.