Goals: to compare the tenets and limits of biomedical vs. social determinants of health, to review the evidence of social inequalities in health, to explore how the social determinants of health can be addressed. Part a : tenets and limits of biomedical vs. social determinants of health. What determines our health: traditional health sciences approach, social determinants of health approach. I- the traditional approach: biomedical / epidemiological lens, biomedical / epidemiological lens. Health is determined by: genetic and biological factors (sex, age, genetic make up, physiological interactions, individual behaviours (alcohol use, smoking, unprotected sex, drug use, nonadherence to treatment and medical care) => categories created by society based on our perceptions, values, norms, ideas and practices. Eg : overweight can be seen as good health/beauty in some places: health is considered an individual v social issue. Economic growth depressed by 1. 3 % every year in places where there is malaria.