For example using a microwave with microscopic cracks in the glass and staying nearby. All the diesel particles and exhaust car fumes and tire dust in the cities. The terrible air quality near maritime ports because of the bad quality ships do with ultra cheap fuels.
The extermination of gut microbiota with the use of pesticides and the use of artificial sweeteners.
Genetically engineered food that is flooded in pesticides(engineered so the plant can withstand them).
The excess use of liquid oils and refined sugars that were never consumed by humans and that are correlated with cancer and cardiovascular disease.
The excess use of the fridge and premade foods making essential nutrients go away as the food freezes, so you eat but starve.
Contraceptive pills that are hormone bombs in your body.
Chemical products like benzene that industries like energy extraction's leak on aquifers and Perfluorooctanoic acid you could generate just burning a teflon pan you forget to put oil or butter in(or using the 3d printer with exotic materials).
All of those risk can be extreme but most people just can't see it. I have seen people burn out a teflon pan and not understand that they have to trow it away immediately. I have seen people handling benzene like water.
You can believe that you are eating healthy because you eat lots of vegetables but if those are flooded in pesticides, then it is not so healthy.