New Research: These B Vitamins Could Lower Your Stroke Risk by 20%

Yesterday's rally, today's hangover. Oil's back up. Tehran still denying talks.

The quick scan: Tuesday gave back a portion of Monday's gains as the conflicting headlines that drove the initial relief rally came home to roost. Iranian state media continued to deny that direct talks with the US had taken place, oil climbed back above $104 a barrel, and AI-exposed tech stocks sold off sharply. The session was a reminder that one social media post does not resolve a war.

S&P 500: –0.37% to 6,556.37 – paring Monday's gains; markets remain in correction territory relative to January's peak
Dow Jones: –0.18% to 46,124.06 – relatively contained losses as defensives held; Walmart gained while tech-heavy names dragged
NASDAQ: –0.84% to 21,761.89 – the sharpest decline of the three, with Oracle shedding 4.7%, and Microsoft, Alphabet, Palantir, and Salesforce each falling between 3% and 6%.

What's driving it: The Tuesday session exposed how fragile Monday's relief rally was. Tehran's ongoing denial of direct talks pushed Brent crude back above $104, reversing a meaningful chunk of Monday's oil price relief. The energy sector was the only S&P 500 group in positive territory for the month. In tech, the AI trade faced fresh pressure as investors questioned whether capital-intensive AI businesses can sustain their valuations in a high-energy-cost, high-rate environment. Apollo's private credit fund revealed it had received redemption requests totalling 11.2% of shares – more than double its 5% quarterly limit – sending its shares down more than 3% and raising fresh questions about private credit exposure across the sector. Trump reiterated that negotiations with Iran are "happening right now," but markets are now pricing the gap between what Washington says and what Tehran confirms.

Bottom line: The pattern this past week – sharp rally on ceasefire hope, partial reversal when that hope is complicated – is likely to repeat until there is a confirmed, verified development rather than a social media post. For L-Plate Retirees, the volatility underscores the value of not making portfolio decisions in reaction to single-day moves in either direction. The underlying drivers – oil, the Fed, and the war's duration – haven't changed. The glide path principle we covered in today's main article applies here too: structure over reaction.

The Stroke-Risk Finding Hidden in Your Grocery List

The scoop: Stroke is the most common cause of disability in the United States – and in most developed countries, it ranks among the leading causes of both death and long-term functional decline. Most of us know the broad preventive playbook: eat well, exercise, don't smoke. What most of us don't know is that a specific group of nutrients may be doing quiet work in the background – and that a large new study suggests we'd do well to pay more attention to them.

Research published in the American Journal of Preventive Cardiology has found that higher dietary intake of five specific B vitamins – B1 (thiamin), B2 (riboflavin), B3 (niacin), B6 (pyridoxine), and B9 (folate) – is associated with up to a 20% lower risk of stroke compared to those with the lowest intake of these vitamins.

The study is substantial. Researchers analysed nutrition data and blood biomarkers from two large national cohort studies – the Women's Health Initiative and the All of Us Research Program – covering approximately 222,000 men and women tracked over time. Over two decades of follow-up in the Women's Health Initiative, around 6,800 participants had a stroke. Those in the highest intake group for the five B vitamins had significantly better outcomes.

The All of Us cohort added further texture: over six years, around 5,200 participants had strokes, and higher intakes of B6 and B9 specifically were again associated with lower risk.

Why B vitamins? The mechanisms are layered.

The most well-known explanation is the homocysteine connection. Homocysteine is a molecule that increases stroke risk by promoting blood clots and damaging artery walls. B vitamins – particularly folate and B6 – help break homocysteine down, keeping levels in check. It's a compelling pathway. But the study's co-author, Dr Simin Liu of the Center for Global Cardiometabolic Health at UC Irvine, notes that homocysteine reduction accounts for only about 11% of the link between folate and reduced stroke risk. There's more going on.

Inflammation is another piece. Dr Sonya Angelone, a registered dietitian in San Francisco, points out that chronic inflammation drives atherosclerosis – the plaque build-up in arteries that can lead to stroke when it occurs in the brain. Several B vitamins help regulate inflammatory pathways and support the energy production that keeps blood vessels functioning well. The full picture is still being mapped, but the direction of the evidence is consistent.

Not all B vitamins behave the same way.

One of the more nuanced findings concerns the dose-response relationship. For folate (B9), the pattern was straightforward – the more, the better, at least up to 2,000 dietary folate equivalents per day. For the other four B vitamins – thiamin, riboflavin, niacin, and pyridoxine – the pattern was what researchers call reverse J-shaped. Higher intake is generally better, but there does appear to be a threshold beyond which more isn't better.

What that threshold is will vary from person to person, depending on individual absorption and metabolism. Angelone's advice is practical: avoid both deficiencies and excesses. You're not trying to megadose. You're trying to cover your bases consistently.

Food first – but know when to discuss supplements.

The study found benefits from both dietary intake and supplementation. That said, Dr Liu is careful not to overstate the case for supplements: there isn't yet much clinical trial data specifically on supplementing with B1 or B2, and the findings shouldn't be read as a green light for high-dose B vitamin regimens. The better approach, Angelone suggests, is to prioritise food sources wherever possible – whole foods deliver B vitamins alongside fibre and other nutrients that work synergistically.

Where supplements may be worth discussing with a doctor: if you have a family history of cardiovascular disease, history of pregnancy loss, high homocysteine levels, or known deficiencies in blood levels of these vitamins.

The five B vitamins and where to find them.

• B1 (Thiamin): whole grains, legumes, pork, sunflower seeds

• B2 (Riboflavin): dairy products, eggs, lean meats, almonds

• B3 (Niacin): whole grains, poultry, tuna, salmon, peanuts

• B6 (Pyridoxine): poultry, fish, potatoes, chickpeas, bananas

• B9 (Folate): dark green leafy vegetables, legumes, asparagus, avocado, edamame, citrus fruits

The overlap across these food groups is worth noticing. Whole grains, legumes, poultry, and leafy greens appear repeatedly. This isn't a complicated or exotic shopping list – it's the Mediterranean-adjacent diet that keeps showing up in longevity research, now with a specific stroke-reduction mechanism attached to it.

As Dr Liu puts it: "Even in the United States, where foods are already widely fortified with folic acid, maintaining higher long-term levels of vitamins B1, B2, B3, B6, and folate does seem to be important in terms of lowering stroke risk."

For those of us who are older, active, and paying attention to brain health – and who may have spent years inadvertently under-consuming some of these vitamins – this is a finding worth acting on.

Actionable takeaways for L-Plate Retirees:

• Focus on the five, not the whole B complex. The study specifically identified B1, B2, B3, B6, and folate (B9) as the meaningful players for stroke risk. You don't need to chase the entire alphabet – target these five through diet consistently.

• Folate deserves special attention. Of the five, folate showed the clearest dose-response benefit and the strongest association with lower stroke risk across both cohorts. Dark leafy greens, legumes, avocado, edamame, and citrus are your most efficient sources.

• Build the five into meals you're already making. Salmon or tuna with a green salad and whole-grain bread covers B3, B9, and B2 in one sitting. A banana with almonds as a snack covers B6 and B2. The goal is consistency over time, not a single superfood.

• Don't interpret the findings as a supplement prescription. Dr Liu explicitly cautions against starting a high-dose B vitamin regimen based on this research. If you're eating varied whole foods regularly, you're likely getting adequate amounts. If you're concerned about deficiencies or have cardiovascular risk factors, talk to your GP before adding supplements.

• Check whether you have any of the risk factors that do warrant supplement discussion. Family history of early cardiovascular disease, high homocysteine on a blood test, or a history of certain pregnancy complications are the flags that make a conversation with your doctor worthwhile.

• Treat this as one layer in a stroke-prevention strategy, not a standalone fix. The researchers are clear: B vitamins are part of a risk-reduction approach alongside diet broadly, exercise, not smoking, and blood pressure management. No single nutrient does all the work.

Your Turn:
Of the five B vitamins identified in the study, which ones do you think you're getting consistently through your regular diet – and which ones might be the gap?
Stroke tends to get less attention than heart attack in public health messaging. Has that meant it's been lower on your own health radar – and does a finding like this shift that?
The study's advice is essentially "eat more whole foods, legumes, leafy greens, and fish." Is that different from what you're already doing – and if so, what's the one practical change that would be easiest to make?

👉 Hit reply and share your thoughts – your answers could inspire fellow readers in future issues.

If this issue gave you a useful nudge toward the grocery aisle rather than the supplement shelf, consider shouting L-Plate Retiree a coffee on Ko-fi.