Long-term trends in obesity and overweight in women in Ghana from 2003-2023.

BACKGROUND

In Ghana, overweight and obesity prevalence among women (20-49 years) reached 50% in 2022, increasing from 40% in 2014. This study aims to understand what has driven previous trends in overweight and obesity among women of reproductive age in Ghana and to predict future trends that can help inform policy making and public health surveillance.

METHODS

We used data from the Ghana Demographic and Health Survey (DHS) containing information on women of reproductive age (aged 15 to 49 years). Data collected between 2003 and 2022 provided cohorts born between 1953 and 2007. Age-period-cohort (APC) analysis was used to disentangle the effects of age, time, and generation on trends in the odds of obesity and overweight.

RESULTS

The prevalence of overweight and obesity increases during the study period, especially with age, in all cohorts. In the APC analysis, the odds of obesity increase with age until age 42-43 years (odds ratio (OR): 9.37; 95% confidence interval (CI): 5.63-15.59, compared to 20-21 year olds) before levelling out. Accounting for age and birth cohort, the odds of overweight and obesity increase significantly over time between 2003 and 2015 (overweight OR: 1.76; 95% CI: 1.47-2.11, obesity OR: 2.27; 95% CI: 1.77-2.91), after which the effect levels out and appears to stabilise. There is no effect of birth cohort on the odds of overweight or obesity.

CONCLUSIONS

Although high, the increasing odds of obesity and overweight in Ghana appears to be stabilising. However, the increasing odds of obesity with age, suggest that an ageing population could mean that the prevalence will increase into the future.