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All right here's the deal:
It's my Junior year in High School and I have been taking a lot of AP classes, and for the past few months I have been drinking tons of coffee. I MEAN TONS. 1-3 liters almost everyday. My skin has been looking kind of "eh," lately from scarring, but for the past few day I've stopped drinking coffee and my skin looks worse. It looks more red than when I was drinking coffee everyday. I have also been drinking green tea for a while too, 1-2 liters a day, but I haven't stopped drinking that. Also every now and then drinking a liter of water.
Could the antioxidants in coffee have some kind of a health benefit to acne? I've read that coffee will do good things for your liver, which I've heard is linked to acne.
On the other hand, I've noticed that whenever I change my diet, for good or for bad, my skin doesn't like it and gets worse. So if I have been eatting Mac Donalds everyday for a month, and then switch to nothing but Salads for lunch, my skin doesn't like it, and if I switch back from Salads to Mac Donalds, my skin doesn't like that either. It could be that, my hormones (or whatever) don't like change. I hate my genes.
maybe its a kind of detox effect? i used to drink at least one cup a day, but have since given it up (along with dairy, sugar and wheat) and my skin is improving. hard to say exactly what is responsible for that, but i will add in one at a time after a few months and see what the reaction is.
i know when i gave up coffee cold turkey i got AWFUL headaches around lunchtime. so, i had to wean off by having 1/2 regular, 1/2 decaf and slowly upping the decaf portion until i was off the caffine. nasty!
Wow, how can you handle that much caffeine? I'm not particularly sensitive to it and can usually handle several caffeinated sodas or coffee just fine, but one time in high school I made the mistake of starting a research paper at 1 am the day it was due, so I drank a whole pot of coffee throughout the night and morning. I ended up feeling too sick to go to class, so I just drove to school to drop off my paper and called myself in sick. I was seriously on my couch in the fetal position shaking for a couple of hours after that, horrible headache, couldn't do anything.
Wow, how can you handle that much caffeine? I'm not particularly sensitive to it and can usually handle several caffeinated sodas or coffee just fine, but one time in high school I made the mistake of starting a research paper at 1 am the day it was due, so I drank a whole pot of coffee throughout the night and morning. I ended up feeling too sick to go to class, so I just drove to school to drop off my paper and called myself in sick. I was seriously on my couch in the fetal position shaking for a couple of hours after that, horrible headache, couldn't do anything.
You're body builds up a tolerance within a few days, as with most stimulants. To get used to drinking that much takes a while.
Withdrawing from that much coffee is not going to be fun. Headaches, fatigue, apathy, dizziness, eyes sensitive to light, etc.
Coffee does have some health benefits, but it also can cause problems. Namely coffee increases cortisol and IGF-1. Cortisol is related to stress, and that hormone can change the way fat accumulates around your hips and abs in a bad way, especially as you get older. IGF-1 is correlated with cancer. It's great to spike insulin after workouts, but sipping on something all day that increases it will lead to health problems in the long term.
All right here's the deal:
It's my Junior year in High School and I have been taking a lot of AP classes, and for the past few months I have been drinking tons of coffee. I MEAN TONS. 1-3 liters almost everyday. My skin has been looking kind of "eh," lately from scarring, but for the past few day I've stopped drinking coffee and my skin looks worse. It looks more red than when I was drinking coffee everyday. I have also been drinking green tea for a while too, 1-2 liters a day, but I haven't stopped drinking that. Also every now and then drinking a liter of water.
Could the antioxidants in coffee have some kind of a health benefit to acne? I've read that coffee will do good things for your liver, which I've heard is linked to acne.
On the other hand, I've noticed that whenever I change my diet, for good or for bad, my skin doesn't like it and gets worse. So if I have been eatting Mac Donalds everyday for a month, and then switch to nothing but Salads for lunch, my skin doesn't like it, and if I switch back from Salads to Mac Donalds, my skin doesn't like that either. It could be that, my hormones (or whatever) don't like change. I hate my genes.
Haha, switching from McDonalds to salad after a month will probably upset a little more than your skin... 
But honestly, I doubt it has anything to do with the coffee but more so the water and green tea, if even.
Coffee contains caffeine, which will actually dehydrate your body if too much is consumed and isn't balanced out with at least a few glasses of water a day. Your diet does affect your skin (obviously) and so if you are dehydrated, you can bet your skin is as well. This means your skin isn't retaining as much water as it should be and therefore, isn't retaining much moisture either (seeing that water helps our bodies absorb and hold moisture in the first place).
So if anything, I would guess that coffee is not what improved the clarity of your skin, but the green tea. And considering you're still drinking the green tea (which has LOADS of antioxidants, by the way), I think it would be logical to suggest that your skin is just flat out exhausted.
You've been on a caffeine spree for the past few months. Depending on this stimulant for an extended amount of time will naturally affect your sleeping habits...Perhaps you kept yourself going for so long that your body adjusted to the changes, but once you returned to your old patterns, your body crashed and with it, your skin?
Just a thought 
Oh yeah, just for the record I was exaggerating about Macdonalds and Salads, but I'm sure you got the picture. 
You've been on a caffeine spree for the past few months. Depending on this stimulant for an extended amount of time will naturally affect your sleeping habits...
Yeah... it's a lot more difficult to wake up now then it used to be, but I can still wake up.
Perhaps you kept yourself going for so long that your body adjusted to the changes, but once you returned to your old patterns, your body crashed and with it, your skin?
Just a thought
I like this idea to explain it.... seems logical.
After many years I have found that 1) stopping soap use and 2) switching to just witch hazel with aloe vera and the 3) addition of coffee with half and half and no sugar reliably clears me up. I even stopped for a week to confirm. Caffeine was making me dizzy unless I added magnesium so I stopped. Flare ups return. On a lark I switch to decaf. Cured. I have no idea what else is in coffee but I suspect the diuretic effect has something to do with it. I don't know that for certain but that coffee for me, after many years of searching, appears to be a reliable and repeatable cure. Better than accutane (again, for me - I am mindful).
Oh - I stopped using soap when I washed my leg with face soap and it broke out too. Witch hazel works great without the problems. Again I haven't the foggiest ideas as to why this work but thought I should share it.
To sum up
1) no soap - ever - on my face (I know, odd)
2) witch hazel (and astringent the ladies use to clean off make up - once in the morning and once in the evening)
3) 1 cup of decaf or regular coffee with no sugar
Again - I have not idea why this works but I have been able to repeat it so I wanted to share as a data point.