Hi there! Really interesting to hear about your grandmother! After having read about fasting and tried it I am convinced that her unintentional fasting must have contributed a great deal to her health and long life.

Intermittent fasting is easier than longer fasts. And, you can still eat a lot during the hours you eat, so you do not feel deprived. There is a study on mice that shows that the group that was eating unhealthy and calorie rich foods but was only allowed access to them during 8 hours, was protected from a bunch of diseases. This, while another group ate exactly the same amount of the same food, but was nibbling throughout the day and night got fat and started having all sorts of health problems.

So, I think that one slightly simpler way of becoming healthier is to limit the hours that you eat and fast the other hours. Anyways, that has been my experience. I don't know if it might help.

Cheers!