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 Ketchup and Mayonnaise
We've previously looked at ultra-processed foods (UPFs), and why they can be a challenge for people with histamine intolerance. Long ingredient lists and ambiguous 'natural flavourings' can hide histamine and histamine liberators that can bring on reactions.
Unfortunately, two of the biggest culprits are two of the most common British condiments: tomato ketchup and mayonnaise. In this Kitchen Swaps article we're going to examine why they can be a trap and learn what the best replacements are to keep bringing flavour to your food.
Why Ketchup Can Be a Problem
Tomato sauce or ketchup presents a double challenge for people with histamine intolerance, as two main ingredients are often the biggest issues:
- Tomatoes: As we explore in our guide to replacing tomatoes, tomatoes are naturally high in histamine, especially when very ripe and processed into a paste or sauce
- Vinegar: Standard ketchup uses vinegar for its acidity and preservative qualities. Vinegar is a fermented product which means it naturally contains high levels of histamine. You can learn more in our Kitchen Swaps article on vinegar
Why Mayonnaise and Salad Cream Can Be Problems
With mayonnaise and salad cream, the issues are slightly different but can be just as significant:
- Acidity Source: Like ketchup, these condiments rely on an acid for their flavour. This is usually vinegar (high in histamine) or lemon juice, which is widely recognised as a histamine liberator. This means it can trigger your body’s own cells to release their internal histamine stores
- Egg Whites: For some people, egg whites can also act as histamine liberators, adding another potential layer to the reaction. While this is a lower risk and the science is less proven, for some people in can be significant
What Job Are They Doing in a Dish?
As ever, the only way that we can find a good substitute is by understanding what role the original ingredient is playing. It is rarely just one thing. By breaking it down, we can build a replacement that truly works.
- Ketchup provides sweetness, a sharp acidity, a deep savoury (or umami) flavour, and a vibrant red colour
- Mayonnaise and Salad Cream provide a rich creaminess from fat, body and texture to a sandwich or salad, and a tangy acidity that cuts through that richness
Low Histamine Swaps for Ketchup
Replicating the unique flavour of ketchup is a challenge, but by focusing on its core jobs (sweetness, acidity, colour), we can get very close.
| Swap | What it Replicates | What You Lose | How to Adjust | Freshness Note |
|---|---|---|---|---|
| Homemade 'Nomato' Sauce | Acidity, sweetness, colour, body | The specific umami of tomato | Purée roasted carrots and red peppers with a little water. Add a pinch of salt and a tiny dash of maple syrup or a tolerated sweetener to balance the flavour. | Best made fresh and frozen immediately in portions. Use the freeze-flat method for quick defrosting. |
| Red Pepper Coulis | Colour, sweetness | Acidity and rich body | Blend roasted red peppers (from a jar, rinsed well) with a splash of olive oil and a pinch of salt until smooth. | Use immediately after making. |
| Blackberry or Cherry Sauce | Acidity, sweetness, colour | Savoury umami notes | Gently cook fresh or frozen berries with a little water and a pinch of salt until they break down. Works surprisingly well with rich meats like duck or lamb. | Can be made with fresh or frozen fruit. |
Low Histamine Swaps for Mayonnaise and Salad Cream
For mayonnaise, the goal is to replicate that creamy richness without the problematic acid or egg.
| Swap | What it Replicates | What You Lose | How to Adjust | Freshness Note |
|---|---|---|---|---|
| Blended Cashew or Macadamia Cream | Creaminess, richness, body | The tangy acidity | Soak raw, unsalted nuts in hot water for 30 minutes, then blend with fresh water and a pinch of salt until completely smooth. | Use the freshest nuts you can find. Prepare just before serving. |
| Unsweetened Coconut Yoghurt | Creaminess, a slight tang | The richness and fat content | Ensure it is plain and unsweetened with no problematic additives. Can be used as a base for dips or dressings. | Always use from a freshly opened tub. |
| Olive Oil & Herb Emulsion | Richness (from fat) | Creamy texture and body | Whisk a good quality extra virgin olive oil with finely chopped fresh, low-histamine herbs (like parsley or chives) and a pinch of salt. | Only use fresh herbs. |
The Swap Everyone Recommends (And Shouldn't)
You might see someone recommend that you "just use a vegan mayonnaise" as an easy, swap. While this solves the potential issue of eggs as a histamine liberator, it rarely solves the main problem. Most commercial vegan mayonnaises still rely on vinegar or lemon juice for their essential tang and acidity. Many also use soy protein, which can be a histamine liberator for some, or mustard, which can also be problematic. Always be sure to read the label carefully remember that 'vegan' does not mean 'low histamine'.
If You Can Tolerate a Little...
Everyone's histamine tolerance is different. Once you have a better understanding of your personal triggers through a histamine diary, you might find you have some wiggle room. For some, a very small amount of a high-quality, organic ketchup with no added spices might be manageable if the rest of the meal is very low in histamine. For others, an egg-free mayonnaise that uses a tiny amount of apple cider vinegar might be okay if their main issue is with eggs, not vinegar.
Navigating these choices is about understanding your own body. For those with a diagnosed DAO deficiency, managing the total histamine load from a meal is key. It is possible to make up for a lack of natural DAO by taking DAO supplements. Our supplement, Aperitif, is designed to be taken 15 to 20 minutes before a meal to help with the digestion of histamine from food and drink.
The condiment shelf does not have to be off-limits forever, and by understanding what makes them problematic you can start to get creative with your alternatives and still enjoy flavourful additions to your favourite meals. Always consult a qualified healthcare practitioner before making significant dietary changes.
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.