Coffee isn't going to interrupt your fast, assuming it's black. I too skip breakfast and try to fast as long as possible. Fasting is tremendously helpful to productivity. Nothing will hinder your performance like a huge meal in the morning (especially one high in carbohydrates)
> I have one espresso immediately when I wake up and one after lunch. I assume this is about 200mg total of caffeine per day.
Interesting how often folks overestimate the caffeine in a shot of espresso. A single shot is like 60mg. You get far more out of drip coffee, especially the lighter roasts.
> I don’t think most people value their time enough
This is huge. Value your time! Not only that, build a culture around you of people who value their time. Work at a company that values work-life balance. This doesn't mean you don't want to work hard... in fact it usually means the opposite because when you are at work you are working hard because you are valuing yourself and your time.