Caffeine influences your digestive system in multiple ways. It serves as a diuretic, it quickens the digestive process and it stimulates your colon. The effect of these mechanisms varies based on other physical factors; depending on your situation, caffeine can actually cause, relieve, worsen or prevent constipation.

Unlike vitamins, minerals and other nutrients, there is no set limit for a maximum daily dose of caffeine. Depending on your own sensitivity to caffeine, you could max out with a single cup of coffee, which generally contains up to 100 mg of the stimulating drug.

Excedrin is an over-the-counter medication marketed by the pharmaceutical company Navartis as a pain reliever. Although originally formulated to treat headache pain, Excedrin now includes a family of medications to target other types of pain.

Caffeine pills are stimulants used mainly to enhance awareness and boost energy levels. In some cases, caffeine pills may be used to control appetite.

Swollen lips is a concerning symptom that needs the evaluation of your doctor. Lip swelling often is associated with a severe allergic reaction that could cause death if not promptly treated. Caffeine, like any other drug, can cause an abnormal reaction of your immune system, leading to an allergic reaction.

You need your morning cup of joe and sometimes, you need it fast. Instant coffee serves as a quicker alternative to freshly brewed coffee and all you need to prepare a cup is hot water to dissolve the caffeinated granules. In general, instant coffee contains less caffeine than brewed coffee.

Drinking caffeine not only helps you stay awake, but it can aid in healthy weight management and boost athletic performance. Caffeine may even affect your body’s metabolism. Too much caffeine can be counterproductive, however.

Drinking a cup of coffee won't likely force you to sprint to the bathroom, but too many cups in one day might give your stomach a gurgling feeling that indicates diarrhea is on its way.

It's well known that coffee is one of the most popular drinks in the world. More than 83 percent of American adults enjoy coffee in some form, according to 2013 data from the National Coffee Association. Coffee affects its drinkers differently, but a single cup can often help keep you awake for several hours.

If you've ever wondered why you usually feel better after drinking a cup of coffee, the answer might surprise you. Caffeine increases your brain's production of one of the "feel-good" neurotransmitters known as dopamine. Among its other functions, dopamine is well-known for its pleasure-enhancing properties.

Vegetarianism can be a healthy way to eat, provided that you design your meals carefully to give your body all the nutrients it needs. If your vegetarian diet lacks certain vitamins and minerals, you may develop deficiencies that can be damaging to your health and even life-threatening.

The thyroid gland is an important part of the body’s regulatory mechanisms; thyroid problems can affect everything from body temperature to appetite to the pulse. Thyroid disease can include high levels of thyroid hormones and low levels -- each causes different symptoms.