Can I just add: In addition to this, if you struggle with anxiety or have some sort of ADHD, then try cutting out caffeine entirely . Not just switching to "decaf" (which isn't), but cutting out tea and coffee, and switching to an alternative like Barleycup. Doing this has had a massive positive effect for me, and combined with decent nutrition and daily exercise, has been wonderful.
Im on week 3 of no coffee now, I will maybe give it a month or two more to make a judgement call if I want to continue with coffee or not.
It is unfortunate as I really enjoy coffee, but it causes some issues for me with anxiety and stomach problems.