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.
Michael MarmotGeneral improvements in health/decline in mortality do not affect all classes equally. As mortality rates fall, social inequalities commonly widen.
Michael MarmotIt'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.
Michael Marmot