Throwing young people on the scrap heap is a public health emergency.

The environment can actually affect gene expression.

General improvements in health/decline in mortality do not affect all classes equally. As mortality rates fall, social inequalities commonly widen.

There's good evidence that if people are disempowered, if they have little control over their lives, if they're socially isolated or unable to participate fully in society, then there are biological effects.

... social environment in childhood affects achieved adult height, life chances, and ultimately mortality rates in adult life. (...) ... social circumstances acting in childhood do have a persisting effect on adult disease rates, in addition to influences acting in adulthood.

It's not just that people with no education have worse health. People with a bit of education at somewhat better, with a lot of education it's even better. And with even more education it's better still.

The lower you are in the hierarchy the worse your health, the higher you are, the better your health.