Well your grandma is probably of my generation and from the 1960s until recently we were told by all the experts that meat and fats were bad, that whole grains were wonderful, sugar was not the problem as much ad fat, etc. A few people like me finally saw the light, but it is hard for people to change long-time indoctrination, be it religion, politic, or good-health matters. So be an example for your gran, share kindly, and maybe she will see the possibilities--or not.
This time, like all times, is a very good one, if we but know what to do with it. Ralph Waldo Emerson
Any given day you are surrounded by 10,000 idiots. Lao Tsu, founder of Taoism