Ever wonder why your grandmother's pulut hitam dessert or a glass of butterfly pea flower tea has that deep purple-blue hue? That colour comes from anthocyanins — and it turns out they may be doing a lot more than just looking pretty on your plate.
Anthocyanins are natural plant pigments that give fruits, vegetables and grains their red, purple and blue colours. They belong to a larger family of plant compounds called flavonoids, which are themselves part of an even bigger group known as polyphenols.
You'll find anthocyanins in foods many of us already eat regularly across Singapore and Malaysia — purple sweet potato in kueh, black glutinous rice in pulut hitam, blue pea flower (bunga telang) in nasi kerabu and kueh salat, purple cabbage in rojak, and of course blueberries and grapes. There are hundreds of different anthocyanin compounds identified in nature, but they all share the same basic job: acting as the plant's own sunscreen and defence system against stress, which is why they cluster in skins and outer layers.
In the body, anthocyanins are best known as antioxidants — compounds that help neutralise unstable molecules called free radicals before they damage your cells. Free radical damage is thought to play a role in ageing and several chronic conditions, which is part of why anthocyanin-rich foods have drawn so much research interest.
Of all the areas researchers have studied, heart health is where anthocyanins show the most consistent promise. Small clinical trials suggest that flavonoid-rich foods and drinks containing anthocyanins may help improve how well your blood vessels relax and widen, a process called endothelial function that matters for healthy blood pressure. Population studies also link regular anthocyanin intake with a lower risk of cardiovascular disease, though it's not yet proven whether these short-term vessel improvements translate into fewer heart attacks or strokes over a lifetime. For someone juggling a stressful Singapore work schedule with limited time to exercise, swapping a sugary teh tarik for a handful of blueberries or a purple sweet potato snack is a small, realistic way to add these compounds to your day.
Several controlled studies suggest that anthocyanins and related compounds may help improve glycaemic control — how well your body manages blood sugar — particularly in people already at risk of or living with type 2 diabetes. This matters in our region, where diets built around white rice, roti prata, and sweet drinks like milo dinosaur can make blood sugar management harder. Anthocyanins aren't a substitute for the basics of a balanced plate, but including anthocyanin-rich vegetables like purple cabbage or ube-style sweet potato alongside your regular meals may offer a helpful nutritional edge.
One long-running US study tracking almost 3,000 older adults found that people with the highest flavonoid intake — anthocyanins among them — had a noticeably lower risk of reporting cognitive decline over 20 years compared to those eating the least. Researchers believe this may be linked to anthocyanins' antioxidant effects reducing brain inflammation, along with possible effects on compounds that help repair and strengthen brain cells. It's still early-stage research and can't prove cause and effect, but it adds to the case for including colourful produce in a brain-protective diet as we age.
Beyond the heart and brain, laboratory and animal studies point to anthocyanins having broader anti-inflammatory and cell-protective effects, with early research exploring roles in liver, gut, kidney and bone health. Human evidence in these areas is still developing and far less established than the cardiovascular findings. Still, because anthocyanins tend to travel with other beneficial plant compounds like fibre and vitamin C in whole foods, eating the fruit or vegetable itself — rather than chasing a single isolated benefit — is generally the more evidence-backed approach.
Here's an important reality check: anthocyanins are among the least well-absorbed flavonoids. Compared to other plant compounds like isoflavones, only a small fraction of the anthocyanins you eat actually makes it into your bloodstream in their original form.
What happens to the rest? Much of it travels down to your large intestine, where gut bacteria break it down into smaller metabolites. Interestingly, some researchers now think these bacterial breakdown products — not just the original anthocyanin molecule — may be responsible for a meaningful share of the health effects observed, which is why a healthy, diverse gut microbiome may actually influence how much benefit you get from your purple foods. Cooking method, ripeness, and how a food is processed can also affect how much anthocyanin content survives to be eaten in the first place.
Anthocyanins from food sources are considered very safe for most people, since they're simply part of everyday fruits, vegetables and grains many of us already eat. Reported side effects from whole-food intake are rare and typically mild, such as occasional digestive discomfort in very large amounts.
Concentrated anthocyanin or berry-extract supplements are a different matter — they haven't been studied nearly as extensively as the whole foods they come from, and no major health authority has approved specific health claims for them. If you're pregnant, breastfeeding, on blood-thinning medication, or managing a chronic condition, it's worth checking with a doctor or pharmacist before starting any concentrated extract. In Singapore, the Health Sciences Authority (HSA) regulates health supplements, so choosing products with proper labelling and avoiding those making bold disease-cure claims is a sensible habit.
Anthocyanins won't cure or prevent any disease on their own, and the science — especially outside heart health — is still catching up to the hype. But as part of a genuinely varied diet built around colourful, minimally processed foods, they represent one more good reason to reach for purple sweet potato over plain white rice, or blueberries over another glass of sugarcane juice.
Given how many of these anthocyanin-rich ingredients already sit within Singaporean and Malaysian food culture — from bunga telang to black rice desserts — getting more of them isn't about chasing an exotic superfood. It's often just a matter of leaning a little more into dishes that are already part of the local table.
This article is for general informational purposes and is not a substitute for professional medical advice. Please consult a qualified healthcare professional before making any changes to your diet or supplement routine.
Ask Elaine how this applies to your goals and routine — free, no pressure.