About this Resource
In the UK and US, over half of all calories consumed come from ultra-processed foods (UPFs), a figure which has been steadily rising over time. The most used definition of ultra-processed food comes from the NOVA classification system which defines them as industrial formulations of ingredients not typically used within home cooking. Numerous strands of evidence point towards UPFs being harmful to health, but the mechanisms by which this occurs remains unclear.

Grounded in the Research
“Recent changes in the food environment, with greater access to and consumption of UPF has been a key driver of obesity. Observational evidence demonstrates positive associations between UPF, weight gain and obesity, and clinical evidence demonstrates increased energy intake and weight gain with UPFs. Mechanisms by which UPF may promote obesity are numerous, but inconclusive. UPFs may capture several characteristics that may encourage overconsumption, which may be insufficiently covered by most national dietary guidelines.”
Excerpt from: Dicken, S.J., Batterham, R.L. Ultra-processed Food and Obesity: What Is the Evidence?. Curr Nutr Rep 13, 23–38 (2024).
References
[1] Marino, M., Puppo, F., Del Bo’, C., Vinelli, V., Riso, P., Porrini, M., & Martini, D. (2021). A systematic review of worldwide consumption of ultra-processed foods: findings and criticisms. Nutrients, 13(8), 2778. https://doi.org/10.3390/nu13082778
[2] Braesco, V., Souchon, I., Sauvant, P., Haurogné, T., Maillot, M., Féart, C., & Darmon, N. (2022). Ultra-processed foods: how functional is the NOVA system?. European Journal of Clinical Nutrition, 76(9), 1245-1253. https://doi.org/10.1038/s41430-022-01099-1
[3] Lane, M. M., Gamage, E., Du, S., Ashtree, D. N., McGuinness, A. J., Gauci, S., … & Marx, W. (2024). Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses. BMJ, 384. https://doi.org/10.1136/bmj-2023-077310
[4] Dicken, S. J., & Batterham, R. L. (2021). The role of diet quality in mediating the association between ultra-processed food intake, obesity and health-related outcomes: a review of prospective cohort studies. Nutrients, 14(1), 23. https://doi.org/10.3390/nu14010023
[5] Askari, M., Heshmati, J., Shahinfar, H., Tripathi, N., & Daneshzad, E. (2020). Ultra-processed food and the risk of overweight and obesity: a systematic review and meta-analysis of observational studies. International Journal of Obesity, 44(10), 2080-2091. https://doi.org/10.1038/s41366-020-00650-z
[6] Elizabeth, L., Machado, P., Zinöcker, M., Baker, P., & Lawrence, M. (2020). Ultra-processed foods and health outcomes: a narrative review. Nutrients, 12(7), 1955. https://doi.org/10.3390/nu12071955
[7] Wang, Z., Lu, C., Cui, L., Fenfen, E., Shang, W., Wang, Z., … & Li, X. (2024). Consumption of ultra-processed foods and multiple health outcomes: An umbrella study of meta-analyses. Food Chemistry, 434, 137460. https://doi.org/10.1016/j.foodchem.2023.137460
[8] Gibney, M. J. (2019). Ultra-processed foods: definitions and policy issues. Current Developments in Nutrition, 3(2), nzy077. https://doi.org/10.1093/cdn/nzy077
[9] Dicken, S. J., & Batterham, R. L. (2024). Ultra-processed Food and Obesity: What Is the Evidence?. Current Nutrition Reports, 13(1), 23-38. https://doi.org/10.1007/s13668-024-00517-z
[10] Hall, K. D., Ayuketah, A., Brychta, R., Cai, H., Cassimatis, T., Chen, K. Y., … & Zhou, M. (2019). Ultra-processed diets cause excess calorie intake and weight gain: an inpatient randomized controlled trial of ad libitum food intake. Cell Metabolism, 30(1), 67-77. https://doi.org/10.1016/j.cmet.2019.05.008
[11] Juul, F., Vaidean, G., & Parekh, N. (2021). Ultra-processed foods and cardiovascular diseases: potential mechanisms of action. Advances in Nutrition, 12(5), 1673-1680. https://doi.org/10.1093/advances/nmab049