Some books I have read address this disparity between people in different circumstances related to distractions and health.

One book I read discusses how our focus is fractured, which leads to poor performance and decisions. Recommendations to meditate or relax aren't as easy for somebody living in a bad neighborhood versus somebody who lives in a more peaceful environment.

Similarly, poverty contributes to poor health as good food tends to cost more than junk food. And struggling to earn money often means that exercise and sleep are sacrificed. There is only so much a person can do in a bad environment to lower stress. And poverty doesn't help an individual feel control of their life.

The point is that your environment contributes greatly to what is possible. That environment also includes a person's family and friends who may have poor mindsets and behaviors that affect their own behavior. We often do what our families and cultures do without questioning because we don't want to be different.

There are so many variables.

I've read that stress is the difference between your expectations and what you actually get.

With this idea, we can also see grief as the difference between expecting to have a lost one and not having them. Instead of gratitude for having had them in our lives, we dwell on the loss, which is the stress. It is a pain, no doubt. But we often experience other things like seeing a great concert, meeting somebody who changed our lives, or some other experience that was meaningful. And we feel grateful that we had that opportunity and look back on that experience fondly, yet we never expected it to last forever. We accept that they have passed and that we had the opportunity to experience them. With grief, in my opinion, we focus more on the loss than the gratitude for having had the time to be with that person.

Ultimately we change what we can, and accept those things we cannot change.