Diabetes classes built around the food people already eat in Cotonou: 36 adults in Benin signed up for 12 weeks, and almost all of them kept coming

Medical nutrition therapy, meaning diet advice tailored to a person by a trained dietitian, is one of the standard pillars of type 2 diabetes care. Nearly all the evidence for it comes from high-income countries, and the advice often assumes foods, prices and kitchens that don't exist elsewhere. Benin had an estimated 467,000 adults living with diabetes in 2024, and specialist nutrition services there are scarce. Researchers at the University of Arizona and the Université d'Abomey-Calavi first asked Beninese patients, families and clinicians how people actually eat, then built a programme around the answers. Its first real-world test was published in Frontiers in Nutrition on 28 October.

The programme, called OSanDiaBé, ran for 12 weeks in Cotonou. Each person had two one-to-one counselling sessions at home and eight group sessions of 90 to 120 minutes in community venues, led by six trained dietitians and nutritionists. The advice used familiar local meals rather than special diabetes foods, measured portions with household utensils and hands, and came with a recipe booklet designed to balance nutrition against what families could afford. There were cooking demonstrations, exercise sessions, picture-based handouts for people who read less easily, explanations in local languages when French wasn't enough, family members invited along, and a moderated WhatsApp group between meetings.

The 36 participants were aged 40 to 65 (average 50) and had lived with diabetes for about 11 years, with HbA1c of at least 7%. Six in ten said their household income covered only routine expenses or less, and over four in ten were on insulin. Thirty finished the 12 weeks, and the 34 who joined the groups came to an average of 7.2 of the 8 sessions. Asked whether they were satisfied, they scored it 4.87 out of 5. Every target the team had set in advance for recruitment, retention, attendance, sticking to the plan and satisfaction was met.

Among the 30 who finished, average HbA1c fell from 7.53% to 6.95%, a drop of 0.58 percentage points with a wide margin (0.04 to 1.12). Weight fell by 0.8 kg on average. The share who said they exercised regularly went from 27% to 87%, a diet questionnaire score rose by 9 points, and confidence in managing diabetes rose by 15 points. Knowledge of treatment showed the biggest jump: 7 of 30 people answered well at the start, 28 of 30 at the end. Waist size and blood pressure moved down a little but not clearly.

None of this proves the programme works, and the authors say so plainly. There was no comparison group, so the changes could reflect the extra attention, people's own efforts or the tendency of high readings to drift down on a second test. Everyone had already helped refine the programme in an earlier stage, so they were likely keener than the average patient, and many of the behaviour measures were self-reported. People were reimbursed for transport and given small incentives, and the cost of running it wasn't measured. The useful finding is the practical one: adults with diabetes in a low-income city came back week after week to learn to eat well with the food they already buy. The next step is a randomised trial.