Do you find yourself reaching for a plate of steaming basmati rice or a stack of soft roti at every family dinner, wondering which choice is better for your health? In my practice, I often see UK South Asian clients grappling with this exact question, especially when they have a family history of type 2 diabetes.
Why the South Asian diet matters for diabetes risk
South Asians are three times more likely to develop type 2 diabetes than the general UK population, according to UK Health Security Agency data. The higher risk is driven by a combination of genetics, lifestyle, and, crucially, dietary patterns that are rich in refined carbohydrates such as white rice and white flour roti.
Rice and roti: nutritional differences at a glance
Both staples provide primarily carbohydrate energy, but there are subtle differences that can influence blood glucose spikes:
- Rice: Typically higher glycaemic index (GI) – especially polished white basmati, which can have a GI of 70-80. This means it raises blood glucose more rapidly.
- Roti: Made from whole-wheat flour (atta) when prepared traditionally, it usually has a lower GI (around 55-65) and contains more fibre, which slows glucose absorption.
- Portion size: A standard serving of cooked rice is about 150 g (≈1 cup), whereas a medium roti weighs roughly 45-50 g. Because rice is denser in carbs per gram, you can unintentionally consume more carbohydrate calories.
In my consultations, I encourage clients to compare portion sizes visually – a fist-sized scoop of rice versus two to three roti, each about the size of a palm.
The NICE lower BMI risk threshold for South Asians
Recognising the heightened risk, NICE (2022) recommends a lower BMI cut-off for South Asians: 23 kg/m² instead of the standard 25 kg/m². This means many of my clients who are classified as "healthy weight" by generic charts are actually in a higher-risk category.
For example, a 45-year-old woman, 162 cm tall and weighing 58 kg, has a BMI of 22.1 kg/m² – below the usual 25 kg/m² threshold, but above the South Asian cut-off of 23 kg/m². She would be advised to monitor her carbohydrate intake more closely and consider lifestyle adjustments even though she appears "normal weight".
Practical portion-size strategies for everyday meals
Here are three simple adjustments you can start using tonight:
- Measure your rice with a kitchen scale or a standard ½-cup measuring cup; aim for ½ cup cooked (≈75 g) per main meal.
- Swap one serving of rice for a whole-wheat roti, or combine half a cup of rice with one roti to balance the GI load.
- Boost fibre by adding a handful of lentils, beans or chopped vegetables to the plate – this not only reduces the overall GI but also supports gut health (gut health).
Research suggests these kinds of tweaks can meaningfully lower post-meal glucose peaks, though individual results vary.
Beyond the plate: lifestyle factors that complement dietary changes
Portion control is only part of the picture. Regular physical activity, adequate sleep and stress management all modulate insulin sensitivity. I often recommend a 30-minute brisk walk after dinner, which is a simple, low-cost habit that can support healthier post-meal glucose levels.
If you’re already managing weight, consider the weight loss page for evidence-based strategies that align with the lower BMI threshold.
When to seek professional guidance
If you have a family history of diabetes, pre-diabetes (HbA1c 42-47 mmol/mol), or you’re already above the South Asian BMI cut-off, a personalised nutrition plan can make a huge difference. As a registered nutritionist, I can help you:
- Analyse your typical meals and identify hidden carbs.
- Create a sustainable portion-size guide that respects cultural preferences.
- Integrate the NICE recommendations into your everyday routine in a realistic way.
If you have pre-diabetes or a diagnosed condition, I would always recommend working alongside your GP or a registered dietitian for blood glucose monitoring and clinical management, with dietary support from me complementing that care rather than replacing it.
For more detailed guidance on managing blood sugar, you may find the diabetes nutrition resource useful.
In my online practice, I work with clients worldwide, offering video consultations that fit around your family commitments. Whether you’re looking to prevent diabetes or better control an existing condition, a tailored approach is far more effective than generic advice.
If you would like personalised support with rice, roti and diabetes risk, I offer one-to-one online consultations. View my consultation packages or book a free discovery call to discuss how I can help.