Drinking 2-4 cups daily of either decaffeinated or caffeinated coffee after a heart attack may reduce the risk of cardiovascular disease or ischaemic heart disease according to this study:
Laura H van Dongen, Famke JM Mölenberg, Sabita S Soedamah-Muthu, Daan Kromhout, and Johanna M Geleijnse. Coffee consumption after myocardial infarction and risk of cardiovascular mortality: a prospective analysis in the Alpha Omega Cohort. First published August 23, 2017, doi: 10.3945/ajcn.117.153338 Am J Clin Nutr
ajcn153338 http://ajcn.nutrition.org/content/early/2017/08/23/ajcn.117.153338.abstract?papetoc