Atherosclerosis risk

My brother uses to eat lots of meat, I call him carnivore. He's 25, obese, smoking and doesn't exercise much. He often complains of chest pain, that comes and goes.


I've advised to go for fruits and vegetables and eat meat only once a week. I'm not sure why meat raise atherosclerosis risk? What if it is lean meat, can it still raise the risk or how is it?