When we consume too much coffee, we can become addicted to it. It can overstimulate the brain and drain the adrenal glands, causing chronic fatigue when the body is in a constant state of artificially induced hyperactivity. It can elevate your mood when you are on it, but it also has the effect of causing a mood ‘crash’ when coming off of it. This can lead to irritability, impatience and depression. Large amounts of coffee can adversely affect blood sugar regulation. In addition, too much coffee can eventually stain your teeth. Coffee is also very acidic and if too much is consumed, it can cause stomach and intestinal irritation and discomfort.