I think that there is very unconvincing evidence that caffeine causes weight gain, and I get very tired of the constant "stress = cortisol = fat" garbage.....
Our bodies are MEANT to handle stress, and most of what we handle is child's play compared to our ancestors or most animals. Constant stress is bad, but that is a psychological problem, not a physical one. If you live in this country, have internet to read this and a job to afford the bill, you are doing better than 95% of people alive. Be happy.
My N=1 is that I have been a caffeine drinker my entire adult life. I do 1 or 2 in the morning, another in the afternoon after I break my fast to stop the calorie/circadian rhythm "siesta" reflex I don't touch it after about 4pm though. Sleep like a brick.
Targeting caffeine is an ultimate "trees over forest" idea. If one is 7% and wants to be 5.5% and borderline dead, ok, I will listen....getting to more reasonable goals is about the macro. In this order:
1) No excess PUFA, no seed oils
2) Don't eat every 3 hours. Train at least the ability to fast.
3) Don't eat retarded food. If it requires a machine to do anything but slice it up, don't eat it.
Done. Just wrote my own diet book Good luck. Looks like you are kicking ass already!
"They now look to a single and splendid government of an aristocracy, founded on banking institutions, and moneyed incorporations under the guise and cloak of their favored branches of manufactures, commerce and navigation, riding and ruling over the plundered ploughman and beggared yeomanry." - Thomas Jefferson, 1826