I thought that this question asked on a coffee forum is kind of politically incorrect 😁.
For years I have had two double ristrettos sometimes three a day, with every 9-10 months going lightly on coffee, i.e. no coffee for a week or two, as my pulse rate would go up. Nowadays, it is a strong double ristretto in the morning and rarely could I have a second one around lunch time.
Diet-wise, rule of thumb for me is go easy at evening meals. Omnivore, although I can easily go vegetarian for a week or two effortlessly.
Exercises are essential though. I cannot go without having my endorphins in my blood stream early in the morning.
@Cuprajake what you have done is commendable. This is a massive outcome by any standard.