Just in my own experiences with coffee during a 5 day water fast is it definitely got my heart rate up and dehydrated me a bit. That was on my 4th day. I didn’t drink anything else besides water before that. Just had a habit at work and had a black coffee. I’d say if it was just on your first day, it’s basically a non-issue that your body isn’t in any stage of autophagy, nor will it mess your hormones and offset anything.
It’ll definitely help but I wouldn’t recommend. You could become very agitated taking stims on an empty stomach. I used to be prescribed my freshman year but I definitely got addicted. So glad I got off. Everyone’s different
Ya that’s what I’m doing man making it easier to start, he addresses stimulants in one of the long podcasts where he’s a guest. He thinks coffee screws up your gut and it’s like yer getting those negative side effects because you don’t even like the taste of coffee u like the high it gives you, he compares it to ppl saying liquor tastes good, no it doesn’t u just like being drunk. Then he said it messes with the feeling of smooth energy all day. Which is fair, I imagine that once I get down to certain weight and I’m really trying to dial in my health, then u gotta start trying to not take it, but I’m def gonna keep taking it to help me get this started.Yes I expect to be irritable sometimes but that’s why u just keep yer pie hole shut and just remember being grumpy is all in your head.