How coffee causes exhaustion, fatigue and addiction, Pt 3

Caffeine works by mimicking a hormone that tells the adrenal glands to crank out more adrenaline. The adrenal glands think there is a stressful situation and that they are supposed to be making more adrenal hormone.
Herbal Defense by Ralph T Golan ND, page 280

A dosage of 50 to 100 mg caffeine, the amount in one cup of coffee, will produce a temporary increase in mental clarity and energy levels while simultaneously reducing drowsiness. It also improves muscular-coordinated work activity, such as typing. Through its CNS stimulation, caffeine increases brain activity; however, it also stimulates the cardiovascular system, raising blood pressure and heart rate. It generally speeds up our body by increasing our basal metabolic rate (BMR), which burns more calories. Initially, caffeine may lower blood sugar; however, this can lead to increased hunger or cravings for sweets. After adrenal stimulation, blood sugar rises again. Caffeine also increases respiratory rates, and for people with tight airways, it can open breathing passages. Caffeine is also a diuretic and a mild laxative.
The New Detox Diet by Elson M Haas MD, page 30

Caffeine and nicotine overstimulate the adrenal glands. When these substances, other stressors, and a generally poor diet are combined, the adrenals can enter into a state of emergency. They become depleted of important vitamins, such as B-complex vitamins and vitamin C.
Complete Encyclopedia Of Natural Healing by Gary Null PhD, page 233

Although we think of caffeine in coffee as the "wake-me-up" chemical, chronic use of it may cause fatigue, headache, moodiness, and depression in some people. Because caffeine boosts energy through increasing the production of ATP, the basic unit of energy production in your body, one school of thought suggests that chronically stimulating this system may deplete it, sort of like overworking the soil in farmland. Recommendation: If you are a caffeine junkie (more than 3 cups of coffee a day) and can’t get through the day without your coffee fix, you may be promoting your fatigue with caffeine and need a rest period. Go slowly with your reduction to zero caffeine to avoid developing overwhelming sleepiness and a bad headache.
Doctors Complete Guide Vitamins Minerals by Mary D Eades MD, page 324

Caffeine can have a detrimental effect on blood sugar. When caffeine is ingested, the nervous system is stimulated. Adrenaline is released and, in turn, the liver begins to emit stored blood sugar. Insulin is then released, and blood sugar drops below normal—a common seizure trigger for people with epilepsy. Caffeine can also constrict blood vessels in the brain. It is important for people with epilepsy to know that caffeine can be an ingredient in medications, including some antihistamines and decongestants.
Disease Prevention And Treatment by Life Extension Foundation, page 739

For an optimal response to our plan, we recommend eliminating or sharply reducing your caffeine intake. Caffeine raises levels of adrenaline, causes overexcitation, increases stress, and impairs the relaxation response. It’s hard to be at peace when you’re revved up on caffeine.
Ultraprevention by Mark Hyman MD and Mark Liponis MD, page 241

Watch out for coffee. The caffeine in coffee can upset blood-sugar levels, leaving you fatigued and longing for a quick-pick-me-up snack. Limit coffee to two cups a day.
Food & Mood By Elizabeth Somer MA RD, page 57

Caffeine, in fact, is the most widely used cognitive-enhancement product in our society. Numerous tests have proved that, when used in moderate amounts, caffeine boosts concentration and alertness. Because it is a stimulant, it increases output of adrenaline, and can temporarily improve memory and mood.
Brain Longevity by Dharma Singh Khalsa M.D. with Cameron Stauth, page 266

Caffeine acts directly upon the central nervous system. It brings about an almost immediate sense of clearer thought and lessens fatigue. It also stimulates the release of stored sugar from the liver, which accounts for the "lift" coffee, cola, and chocolate give. But these benefits may be far outweighed by the side effects:
Vitamin Bible for the 21st Century by Earl Mindell, page 315

Caffeine doesn’t add energy to your system, it just burns up your reserves at a faster pace. You get a short-term boost at the expense of long-term jitters and fatigue.
The Unofficial Guide to Beating Stress by Pat Goudey, page 136

On the physical level, we need a steady source of energy to accomplish our goals. Nothing is more frustrating than to be motivated, to have a great plan, but no energy to carry it out. When I ask patients about their reasons for drinking coffee, the most common response is: "I need the energy." The irony is that caffeine is a major cause of fatigue. Depending on caffeine to get you through the day might work for a while, but in the long run it will make your dreams harder and harder to achieve.
Caffeine Blues By Stephen Cherniske MS, page 43

Avoid caffeine — it increases the stress hormones and adrenaline, which causes a spike in blood sugar.
Ultraprevention by Mark Hyman MD and Mark Liponis MD, page 306