People with no or low self-worth are way more likely to neglect their health than those with high self-worth. Pride is a huge motivator for taking care of your health.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC194072/

The levels of obesity and diabetes among the Pima Indians of Arizona have long been recognised to be high. A small study tested the efficacy of lifestyle interventions. Two groups were identified. The Pima action group had a familiar mix of interventions on nutrition and physical activity. The Pima pride group looked remarkably like a control group for a health education trial—they received printed leaflets about activity and nutrition—but in addition they had regular discussions with local leaders on Pima culture and history. At the end of 12 months, much was going in the wrong direction for the action group, but the pride group had either less deterioration of risk factors or improvements. Compared with the action group the pride group looked favourable on weight, waist circumference, and blood glucose and insulin levels two hours after a glucose load.3 A tentative conclusion was that increasing pride in their identity had a more favourable impact on health behaviours and risk than focusing on how to change diet and exercise.

People often don't take care of things they aren't proud of. It doesn't matter if it's clearly in their best interest to.