A word of caution. Many drugs counteract the effects of a poor diet, especially an inflammatory one. Correcting diet without adjusting the drugs can mean overtreatment, which has its own risks.
Best example I can give is that when I took the prescribed anti-platelet regime (clopidogrel and aspirin) after a MI and stents then got onto an anti-inflammatory diet with fish oil, turmeric and cocoa, my blood got too thin. I bruised easily, had constant knee pain and got exertion headaches. Figured I was a stroke candidate so cut out the drugs and fish oil. cutting out the clopidogrel got rid of the knee pain, cutting aspirin got rid of the bruising and cutting fish oil got rid of the exertion headaches.
Your parents may not be up for this kind of trial and error and their physicians will most likely prefer drugs over unproven dietary treatments
Four years Primal with influences from Jaminet & Shanahan and a focus on being anti-inflammatory. Using Primal to treat CVD and prevent stents from blocking free of drugs.
Eat creatures nose-to-tail (animal, fowl, fish, crustacea, molluscs), a large variety of vegetables (raw, cooked and fermented, including safe starches), dairy (cheese & yoghurt), occasional fruit, cocoa, turmeric & red wine