Embarking on a low histamine diet can bring a sense of clarity after a long period of confusing reactions. However, as you remove foods to lower your histamine load, you might start to worry about potential nutritional gaps. This is why we always stress that a restrictive diet should only ever be a short-term diagnostic tool used under professional guidance.
One of the most common challenges is getting enough omega-3 fatty acids. You have likely heard that oily fish is one of the healthiest foods you can eat, but it also appears on almost every high-histamine food list. This article, part of our Nutrition Gaps series, is here to explain why omega-3s matter, untangle the oily fish dilemma, and provide a framework for navigating this challenge.
Why are Omega-3 Fatty Acids So Important?
Omega-3s are a type of polyunsaturated fat that are considered 'essential'. This means your body cannot produce them on its own, so you must get them from your diet. They play a crucial role in many aspects of your health, particularly in building and maintaining a healthy body. They are especially recognised for their role in brain health, heart health, and managing inflammation.
There are three main types of omega-3s:
- ALA (alpha-linolenic acid): Found in plant foods like flaxseeds, chia seeds, and walnuts
- EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid): Found primarily in marine sources, especially oily fish
While your body can convert some ALA into the more active forms of EPA and DHA, this process is known to be very inefficient. This is why sources of EPA and DHA are considered so important for meeting your body's needs.
The Oily Fish Dilemma
Herein lies the central problem for someone with histamine intolerance. The richest dietary sources of EPA and DHA are oily fish like salmon, mackerel, sardines, and herring. Unfortunately, as we explore in our guide to fish and seafood, these are often significant histamine triggers.
This is not because the fish are inherently high in histamine. Rather, fresh fish contains an amino acid called histidine. As the fish ages, bacteria on its surface convert this histidine into histamine. The longer the fish sits around, from the moment it is caught to when it lands on your plate, the higher its histamine content becomes. This is why tinned, smoked, and cured fish are particularly problematic.
A Quick Word on Omega-6 and Balance
It is also helpful to understand omega-6 fatty acids. Like omega-3s, they are essential fats that we need from our diet. However, modern Western diets tend to be extremely high in omega-6 (found in many vegetable oils and processed foods) and low in omega-3. Research suggests that a highly imbalanced ratio of omega-6 to omega-3 may promote inflammation. Striving for a better balance, by reducing excessive omega-6 intake and increasing omega-3, is thought to be beneficial for overall health.
Strategies for Increasing Omega-3 on a Low Histamine Diet
Navigating this dilemma requires a thoughtful approach, ideally in partnership with a professional who understands your unique situation. Here are some strategies you can discuss with your registered dietitian.
1. Prioritise Absolute Freshness
If you tolerate some fish, freshness is non-negotiable. This means buying fish from a trusted fishmonger and cooking it the same day. Even better, your freezer can be your greatest ally. As we explain in our guide to the frozen aisle, fish that is filleted and frozen at sea has its histamine development paused almost immediately. This can make it a much safer option than the 'fresh' fish that has been sitting on ice for an unknown period.
2. Incorporate Plant-Based Sources
While the conversion is inefficient, plant-based ALA is still a valuable part of a balanced diet. Low histamine sources include:
- Ground flaxseeds
- Chia seeds
- Hemp seeds
These can be easily added to smoothies, porridge, or sprinkled over low-histamine yoghurts. Walnuts are also a good source, but they are a known trigger for some people, so approach them with caution.
3. Explore Supplementation with a Professional
If you and your healthcare provider determine that you cannot get enough omega-3 from food, you might explore supplementation. This is a decision that should only be made with professional guidance, as they can help you choose a high-quality product.
- Fish Oil: Quality is paramount. A high-quality fish oil supplement will be purified to remove contaminants and should be fresh, not rancid. Your dietitian can help you identify reputable brands
- Algal Oil: A fantastic alternative, especially for those who cannot tolerate fish at all. Algal oil is a vegan source of both EPA and DHA, derived from the same microalgae that fish eat to obtain their omega-3s
Remember: The Low Histamine Diet is a Temporary Tool
It is vital to remember that a strict low histamine diet is not a lifelong sentence. As we cover in our article on why the diet should be temporary, its purpose is to lower your overall histamine load so you can identify your personal triggers. The long-term goal is always to broaden your diet as much as possible, which is the best way to avoid nutritional gaps like this one.
Working with a registered dietitian is the safest and most effective way to navigate this process. They can help you manage the elimination phase, guide a structured reintroduction of foods, and ensure your diet remains balanced and sustainable. You can find a list of dietitians specialising in histamine intolerance on our About page.
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.