[sam537]

Some comments about dietary science are true. It is extremely impossible to isolate the effect of a single substance (ethically).

This person greatly benefited from stopping caffeine intake which is great. It is part of the journey to understand ourselves and what makes us work/improve/feel better.

If you have a anxiety-o-meter that looks like this: [-----------------------------------]

and your baseline is here: [-------------------------X---------] - you just need a little push to go into anxiety/can't sleep mode which can come from caffeine.

But if your baseline is around here: [--x--------------------------------] -maybe some coffee in the morning, right after lunch will greatly increase your clarity/make you able to fulfill your duties. People who drink caffeine for pleasure (I love the taste of coffee and sometimes I get beans so good that I just want to drink several cups) will notice the negative effect in their sleep/anxiety levels. We must go back to Paracelsus 'dosis sola facit venenum'. The dose makes the poison.