Yes, too much caffeine causes adrenal fatigue. Its also very hard on your liver, which is responsible for every other organ in your body, so the side effects run the gambit.
I switched to organic coffee and I found that I did not have as much side effects. Also, when you quit from organic coffee, you dont get the withdrawal headaches as you would with regular coffee.
This is an excerp taken from the "Super Cleansing" guide
Two of the ﬁrst questions I get from clients when they begin a cleanse are “Do I really need to give up coffee?” and “Can I just drink decaf instead?” The answers are “Yes, you should,” and “Please don’t, it’s just as bad.” When we understand the effect of coffee on the body and what’s in regular and decaffeinated coffee, we can see how they undermine the cleansing process and damage our bodies. Insights from Donna F. Smith, PhD, ND, CCN, shed light on the dark side of the dark-roast brew many of us love:
The Top Five Reasons for Kicking the Coffee Habit
1 Coffee sets off a chain reaction in the body that stresses the adrenals. The acid-based oil in coffee irritates the lining of the stom- ach and increases gastric acidity. That sparks the secretion of adrenaline by the body. Adrenaline stimulates insulin secretion, which fuels hypoglycemia (low blood sugar). The end results are tension, a mild rise in blood pressure, a craving for sweets 2 or 3 hours later, low energy and a depressed mood.
2 Coffee counteracts different medications. When our blood Sugar drops, the body ups the production of epinephrine—which counteracts the medications typically prescribed for people suffering from pain, obesity, hypertension or depression.
3 Coffee causes nutritional deﬁciencies. Heavy coffee drink- ers have a deﬁciency of the B1 vitamin thiamine. Symptoms of B1 deﬁ- ciency range from fatigue, nervousness and malaise to aches, pains and headaches. In addition, regular consumption of coffee prevents nutrients from being absorbed effectively in your small intestines, which leads to further vitamin and mineral deﬁciencies.
4 Pesticides in coffee are toxic to the body. Coffee growers in Colombia—where a vast amount of our coffee comes from—often use harmful pesticides when growing their beans, such as aldrin,
dieldrin, chlordane and heptachlor. Some scientists speculate that coffee beans are the most signiﬁcant source of these toxins in U.S. diets.
5 Long-term coffee consumption taxes the liver, increasing toxicity in the body and opening the door to disease. The func- tion of the liver is to ﬁlter the blood so that it can clean and nourish the cells in our body. When the liver gets overloaded trying to detoxify chemical residues in coffee (and the foods and other substances we bring into our bodies), it becomes congested. And when the liver is congested, it doesn’t properly ﬁlter the blood. Impure blood ends up circulating through the body, impeding cells’ ability to regenerate and grow healthy tissue.
Unfortunately, drinking decaffeinated coffee isn’t any better than drink- ing regular coffee, because it can contain large concentrations of trichloroethylene—a chemical that’s also used as a degreasing agent in the metal industry and a solvent and dry-cleaning agent in the clothing industry. Trichloroethylene is also related to vinyl chloride, a chemical in plastic that’s been linked to certain types of liver cancer.
If you can’t fathom getting through the day without that coffee taste, try herbal drinks with chicory, which has the ﬂavor you love without the harmful side effects. If you need a pick-me-up to start the day, give yerba mate a try. It has effective stimulants but doesn’t produce as many of the negative health effects that caffeine does. An even better, more healthful, option is herbal tea. Herbal teas seem weak to you? Pump them up by using two or three tea bags per cup of tea and letting them steep for a longer period of time. Add a bit of nut milk if you’d like to drink them latte-style (see recipe on page 93).