Food: what are the unsuspected benefits of harissa?

That tiny, red spoonful on your plate does more than make your mouth tingle; it can quietly prompt a range of unexpected responses in your body.

Harissa - the North African chilli paste you’ll find stirred through couscous, tucked into sandwiches and simmered into stews - is often seen as just another condiment. In reality, its punch comes with a little bit of biology: receptors, signalling chemicals and a potential (small) nudge to metabolism.

Harissa: what exactly is it?

Harissa is a fiery paste typically made from red chillies, garlic, oil, salt and spices such as cumin, coriander and caraway. It developed in Tunisia and then became a staple across Maghrebi and wider Middle Eastern cooking.

Compared with a standard hot sauce, harissa is usually thicker, more aromatic and sometimes gently smoky. It works in all sorts of ways: stirred into soups, rubbed onto meat or whisked into yoghurt for a quick, punchy sauce.

Beneath the bold taste, harissa is effectively a concentrated hit of chilli peppers - and with them, capsaicin, the compound that convinces your brain you’re experiencing heat.

Capsaicin: the illusion of burning

Harissa’s signature “kick” comes from capsaicin, an active substance found in chilli peppers. Capsaicin attaches to TRPV1 receptors in the mouth and throat - receptors that normally react to genuinely high temperatures.

Once capsaicin activates those TRPV1 receptors, your nervous system responds as though real heat has arrived. Your brain interprets the signal as burning even though the tissue itself is not actually being harmed.

That’s why a spoonful of harissa can feel like a flare-up of fire while your mouth remains physically fine.

Your tongue isn’t literally burning; your brain is responding as though it is.

How the body reacts to “fake heat”

That false alarm can set off a chain reaction: facial blood vessels open up, sweating may start, and some people notice their heart rate picks up.

At the same time, the body can release endorphins - natural chemicals that act a bit like pain relievers and mood enhancers. This is one reason spicy foods can feel oddly compelling: people aren’t just chasing flavour, they’re also enjoying the mild “rush” that follows the sting.

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Metabolism and weight: can harissa help?

Capsaicin has been researched for possible effects on metabolism and weight management. It isn’t a miracle “slimming paste”, but it may gently push things in a helpful direction.

• Small rise in energy expenditure: capsaicin can slightly increase calorie burn for a short period.
• Thermogenesis: by imitating heat, it encourages the body to spend a bit more energy cooling itself.
• Possible appetite modulation: some people find they eat more slowly or feel a little fuller after a spicy meal.

These effects are still modest. A teaspoon of harissa won’t undo a sedentary routine or an overly rich diet. That said, using it regularly in balanced meals can help support a way of eating that leans towards smaller portions while keeping flavour high.

Harissa won’t take the place of exercise, but it can make a straightforward, healthy dish taste satisfying rather than bland.

Anti-inflammatory and antioxidant potential

Chillies and the spices commonly used in harissa contain antioxidants including vitamin C, carotenoids and flavonoids. These can help counter free radicals - unstable molecules associated with cellular damage and ageing.

Capsaicin itself has also been studied for anti-inflammatory effects. In much higher concentrations it’s used in creams and patches for joint and nerve pain, where it gradually reduces sensitivity in pain fibres. In food the dose is far lower, but it can still contribute to an overall anti-inflammatory pattern of eating - particularly when harissa is paired with vegetables, pulses and olive oil.

Component	Potential benefit
Capsaicin	Encourages thermogenesis; may reduce perceived pain
Garlic	Supports cardiovascular health; may help regulate cholesterol
Cumin and coriander	Can aid digestion; add antioxidants
Olive oil (often used)	Provides healthier fats; helps absorb fat-soluble nutrients

Harissa and digestion: friend or foe?

It’s common to assume spicy foods automatically upset the stomach, but it’s not that simple. In healthy people, moderate chilli intake can stimulate saliva and gastric juices, which may support digestion.

There’s also evidence that capsaicin, eaten regularly in sensible quantities, may help maintain the stomach’s protective mucus lining. Some studies suggest chilli eaters have a lower risk of certain ulcers, possibly because the stomach adapts over time to the repeated stimulus.

For most people, the issue isn’t a small spoonful of harissa - it’s very large portions alongside heavy, fatty meals or alcohol.

However, anyone with irritable bowel syndrome, reflux or active ulcers should be more careful. For them, the same capsaicin that feels pleasantly warming to someone else can trigger burning discomfort or diarrhoea. Tolerance varies a lot, so testing gradually is often the safest approach.

How to integrate harissa into everyday meals

You don’t need to cook a full North African spread to use harissa regularly. A little goes a long way in a modern UK kitchen.

Simple uses at home (with harissa)

• Stir ½ teaspoon into a tray of vegetables before roasting.
• Blend it with yoghurt and lemon juice for a quick dip or marinade.
• Add a small dab to tomato sauces, soups or stews for depth rather than sheer heat.
• Spread a thin layer in a sandwich or wrap instead of mayonnaise.

Keeping the quantity modest lets you enjoy the sensory hit and any potential metabolic effects without overwhelming your system.

An extra practical note: handling, storage and heat levels

Harissa varies a lot in intensity, so it’s worth starting small and adjusting. If you’re using a jar, keep it sealed and refrigerated after opening, and use clean utensils to avoid introducing moisture or crumbs that shorten its shelf life. If you make your own, you can control the heat by reducing chilli quantity, removing seeds, or increasing roasted red peppers for sweetness and body.

Who should be cautious with harissa?

Some people may need a more restrained approach:

• People with reflux or stomach ulcers: even small amounts can cause burning or discomfort.
• Those taking certain medicines: blood thinners or drugs that irritate the stomach lining may not pair well with frequent chilli intake.
• Children: their receptors are often more sensitive, so very spicy foods can feel painful and discourage them from exploring different flavours.

If you get ongoing heartburn, abdominal pain or diarrhoea after spicy meals, it’s sensible to cut back or leave longer gaps between servings. A healthcare professional can help check whether anything else is going on.

Harissa quality and salt content

Not every jar of harissa is made the same way. Some versions lean heavily on salt and oil with fewer chillies, while others include preservatives or added sugar. Checking the label makes it easier to choose a paste that fits your health aims.

If you use it often, look for a product where chilli appears near the top of the ingredients list and the salt level is moderate. You can also dilute ready-made harissa at home by mixing it with extra olive oil, tomato purée or plain yoghurt - which reduces the sodium per spoonful.

From taste buds to brain: why the burn can feel good

Beyond the chemistry, there’s a psychological element. The brief sting of capsaicin can feel like a self-imposed challenge, and when endorphins arrive you get a small sense of reward as the heat fades.

That blend of discomfort and pleasure has helped shape many food traditions. In some places, a meal without chilli can feel unfinished - as though an emotional note is missing. Harissa often plays that role across North Africa, turning simple couscous or bread into something vivid, energising and memorable.

Practical example: a “lighter” dinner using harissa

For a weeknight meal with plenty of flavour but without a heavy sauce, try roasted vegetables with chickpeas. Toss carrots, peppers, onions and courgettes with 1 tablespoon of olive oil, 1 small teaspoon of harissa and a pinch of salt, then roast until caramelised.

The capsaicin and spices add warmth and complexity, which can mean you’re less tempted to pile on extra cheese or creamy dressings. With plain yoghurt and a piece of bread, it can feel indulgent while staying relatively moderate in fat and calories.

Used with intention, harissa can move a meal from dull to deeply satisfying - which may naturally reduce the urge for second helpings.

Key terms worth knowing

Capsaicin is the active compound in chilli peppers that causes the burning sensation and underpins many of the metabolic effects discussed above.

TRPV1 receptors are proteins on nerve endings that detect heat and physical irritation. Capsaicin activates them, sending a “heat” message to the brain.

Thermogenesis is the body’s production of heat. Foods that trigger thermogenesis - including chilli-rich harissa - can slightly increase energy expenditure for a short time.