Dietary patterns and their association with glycated haemoglobin among adults with type 2 diabetes mellitus in urban DR Congo in 2025: a cross-sectional study
This 2025 cross-sectional study of adults with type 2 diabetes in Kinshasa, DR Congo, reveals that poor glycaemic control is widespread and significantly associated with a diet high in refined grains and dairy-sweets, underscoring the urgent need for culturally adapted nutrition counseling and interventions to address food insecurity and systemic barriers.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Imagine your body as a high-tech car engine. For this engine to run smoothly, it needs the right kind of fuel. If you pour in sugar and processed junk, the engine sputters, overheats, and eventually breaks down. In the world of medicine, this "engine trouble" is called Type 2 Diabetes. When people have this condition, their bodies struggle to manage sugar (glucose) in their blood. To check how well the engine is running over the last few months, doctors use a special test called HbA1c. Think of HbA1c as a "fuel quality report card." A low score means the fuel mix is good and the engine is cool; a high score means the fuel is bad, and the engine is overheating.
In many parts of the world, especially in rapidly growing cities, the food landscape is changing fast. People are moving away from traditional meals made of whole plants and vegetables toward cheaper, faster, and more processed foods. This shift, often called a "nutrition transition," is like swapping premium unleaded gas for cheap, dirty sludge. Scientists are very curious about how these new eating habits are affecting the "fuel quality reports" of people who already have diabetes. If we can figure out exactly which foods are clogging the engine in specific cities, we can help doctors give better advice to keep people healthy.
This is exactly what a team of researchers set out to do in Kinshasa, the bustling capital of the Democratic Republic of the Congo (DRC). They wanted to know: What are adults with Type 2 diabetes actually eating, and how does that food mix show up on their HbA1c report cards? They didn't just ask, "Do you eat vegetables?" Instead, they looked at the whole picture of a person's diet, grouping foods into "patterns" like a detective grouping clues. They surveyed 540 adults visiting health clinics in April 2025, asking them about everything from what they ate for breakfast to how often they worried about having enough food for dinner.
The researchers found that the people in Kinshasa weren't just eating random foods; their diets fell into four distinct "flavors" or patterns. One was a "Vegetable, Fish & Plant-rich" pattern, which sounds like a healthy, traditional meal. Another was a "Mixed protein & staple" pattern, a balanced mix of meat and root vegetables. The third was an "Oil & Dairy" pattern. But the fourth one, the "Refined-grain & Dairy-sweet" pattern, was the troublemaker. This diet was heavy on processed white grains (like white bread or polished rice), sugary drinks, sweet dairy products, and lots of cooking oil.
Here is the big discovery: The study suggests that the more a person stuck to that "Refined-grain & Dairy-sweet" diet, the worse their HbA1c report card looked. Specifically, people who ate this way were about 8% to 10% more likely to have high blood sugar levels compared to those who ate less of these foods. It's as if the engine was running on sludge, and the report card proved it. Interestingly, the other three diet patterns, including the healthy-looking vegetable one, didn't show a clear link to better or worse blood sugar control in this specific group.
There was a twist, though. Even though most of the people surveyed said they were following their doctor's diet advice, the vast majority—about 87%—still had uncontrolled diabetes. It's like a driver saying, "I'm driving perfectly," while the car is clearly on fire. The researchers suspect this isn't because the patients are lying or ignoring advice, but because the advice might not fit their reality. Many people in the study faced "food insecurity," meaning they often didn't have enough money to buy the healthy foods they were told to eat. When you are hungry and broke, you might grab the cheapest, most filling food available, which often turns out to be that refined grain and sugar mix.
The study also noticed that people who had been living with diabetes for a long time (more than five years) tended to have higher HbA1c levels, while older age seemed to be linked to slightly lower levels. However, the most important takeaway is that simply telling people to "eat better" isn't working if the system doesn't support them. The researchers suggest that to fix the engine, we need more than just a menu; we need affordable, healthy food options and advice that actually fits the lives of people in Kinshasa. Until then, the "Refined-grain & Dairy-sweet" pattern remains a major culprit in the city's struggle with blood sugar control.
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