It’s one of the most common questions we see. Should I focus on B vitamins or omega-3? They’ve read something about each, and they want to pick one.

The answer is always the same. Both matter, and they work best as a pair.

Here’s why. Research from Oxford, led by Professor David Smith, found that high-dose B vitamins slowed the rate of brain shrinkage in people with mild cognitive impairment. A striking result on its own. But the effect only held in people whose omega-3 levels were adequate. Low omega-3? The B vitamins barely worked. Further research went the other way too, showing that omega-3 works better when B vitamin status is good.

In other words, your brain needs both. They rely on each other.

The mechanism is quite elegant. Certain B vitamins help your body break down homocysteine, folate and B12 in particular, with B6 playing a supporting role. High homocysteine tracks with brain shrinkage and cognitive decline. Omega-3 fats, especially DHA, form the structural walls of your brain cells and calm inflammation. When homocysteine stays in check and brain cells have the fats they need, your brain communicates well.

The good news? Food does most of the work. Some of the best brain-friendly meals bring these two nutrient groups together on the same plate.

Here are five pairings to come back to.

Salmon and spinach
The classic for a reason. Salmon brings DHA and EPA, the long-chain omega-3s your brain uses directly. Spinach is one of the richest sources of folate in the plant world. A simple weeknight supper of pan-seared salmon and wilted spinach with a squeeze of lemon gives your brain a proper meal. Add some garlic and you’ve hit most of your daily folate in one sitting.
Sardines on sourdough with avocado
A five-minute lunch that delivers. Tinned sardines are brilliant and sustainable, with serious omega-3 content. Wholegrain sourdough carries B vitamins, including B1 and B6, and the avocado adds more B6 along with folate. A squeeze of lemon and some chilli flakes if you fancy them. Real food, fast.
Mackerel with lentils and roasted greens
If salmon feels tired, try mackerel. Per gram, mackerel carries even more omega-3. Serve it over warm puy lentils, which are rich in folate, with roasted tenderstem broccoli or cavolo nero for added B vitamins and fibre. A mustardy dressing brings the whole plate together. The kind of supper that leaves you properly fed.
Eggs, smoked salmon and rye toast
Weekend breakfast territory. Egg yolks give you B12 and choline, both vital for memory and nerve function, while smoked salmon adds omega-3. Rye brings B vitamins and steady-release carbohydrate to keep your blood sugar calm through the morning. A proper start to a Saturday, without the sugar crash that follows pastries.
Walnuts and lentils
For the plant-forward days. Walnuts are the nut with the most ALA, the plant form of omega-3. Your body converts a small amount of ALA into DHA, and while the conversion is modest, it still contributes. Toss chopped walnuts through a warm lentil salad with parsley, olive oil and lemon, and you’ve got a bowl rich in ALA, folate, B6 and fibre. A weekday lunch that lands.

These are patterns to return to a few times a week without much planning. The pairings matter more than the perfection.

Where might one of these land on your plate this week?