The effects of caffeine on the body- simple guide 2020

The effects of caffeine on the body- simple guide 2020

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The effects of caffeine: Numerous studies have been conducted on the cardiovascular effects of coffee and the results remain contradictory. The difficulty lies in the composition of the coffee: it contains a large number of substances, whose pharmacological effects are complex and sometimes contradictory.

For example, caffeine acts on blood pressure, while polyphenols have a protective effect on the cardiovascular system. The difficulty also stems from the association of many factors that present a cardiovascular risk (overweight, sedentary lifestyle, alcohol, tobacco, high cholesterol, stress…).

But what we know about coffee & caffeine 

  • Caffeine increases blood pressure, but this effect wears off fairly quickly;
  • Coffee is not currently considered a risk factor for high blood pressure; however, health agencies advise people with high blood pressure to limit their consumption to 3 cups per day;
  • High (more than 5 cups per day, or 450 mg of caffeine) and especially high (more than 10 cups per day, or 1000 mg of caffeine) coffee consumption can increase the risk of myocardial infarction in middle-aged people;
  • in people with heart disease, moderate consumption is recommended.

Sport and coffee: Effects of caffeine intake on muscle

  • Caffeine has a beneficial effect on physical exercise during endurance efforts.
  • The mechanisms cited are an increase in the strength of muscle contraction and the optimization of energy metabolism.

Caffeine and doping: From 1983 to 2003, caffeine was on the list of banned substances and was considered a doping agent when its concentration in the urine exceeded 12 g/ml. In 2004, with the establishment of the World Anti-Doping Agency (WADA), caffeine was removed from the prohibited list. 

Usual and moderate consumption of caffeine is not considered doping behavior. However, the authorities remain vigilant, because caffeine is sometimes absorbed in very large quantities, in medicinal or injectable form, by some top athletes: this is true doping, even if it is practiced by only a very limited number of athletes.

Coffee and cigarettes

Caution: in smokers, tobacco and coffee consumption are often associated, and smoking is a cardiovascular risk factor.


The absorption of caffeine is accelerated in smokers.

The effects of caffeine on health

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MYTH #1: coffee is healthy. MYTH #2: coffee is not healthy. FACTS: the way that coffee impacts your health depends on your current health status, your gender and age, the type of coffee and other factors – similar discourse for many other topics in nutrition. 😏 Let's not leave this subject up to speculation anymore and check out the latest science. ➡️ if you are a healthy young adult and drink coffee regularly, you have a LOWER RISK of liver disease, type 2 diabetes, Parkinson's disease, heart attack and stroke. In short, it's ok for you to drink, without exceeding 4 cups a day. ➡️ if you have extra weight to lose, make sure to avoid coffees with added LIQUID CALORIES coming from syrups, sugar, cream and similar ones. ➡️ if you're at risk of or have already developed type 2 diabetes or have issues with BLOOD GLUCOSE regulation, coffee can impact your levels of blood glucose. Thus, reduce or avoid coffee. ➡️ if you're an older adult, coffee tends to have a greater impact on your SLEEP, so avoid or limit coffee intake especially close to bed time. ➡️ if pregnant or planning to be, it's recommended to avoid coffee. Sources: meta-analyses published within the last 5 years and Mayo Clinic (full bibliography available in the upcoming website). #coffeeandhealth #healthmyths #healthfacts #pregnancynutrition #diabetesnutrition #sleepquality #coffeecalories #yourhealthcoach

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Parkinson’s disease

Coffee consumption reduces the incidence of Parkinson’s disease among regular consumers: the risk of developing the disease is reduced by a factor of 6 for the consumption of 7 cups of coffee or more.

Caffeine acts in an area of the brain that is altered in Parkinson’s disease, but the exact mechanisms are still under investigation.

Type 2 diabetes

Type 2 diabetes is an increasingly frequent disease, linked to the lifestyle of industrialized countries (overweight, sedentary lifestyle, stress…).

Coffee consumption reduces the risk of developing type 2 diabetes: this reduction is found as early as 3 cups of coffee per day and reaches 30-65% for the consumption of 5-7 cups of coffee per day.


The mode of action of this protective effect is complex (combined action of caffeine and polyphenols).

This is one of the most promising effects of coffee.


Alzheimer’s disease

The first results of research in this area have shown that coffee consumption leads to a reduced risk of developing Alzheimer’s disease, but they need to be confirmed.

Asthma and apnea of premature babies

  • Caffeine has been used for many years to treat respiratory problems in premature infants.
  • Caffeine has the property of dilating the bronchial tubes and its effects on asthma are being studied.

Headaches and migraines

  • Caffeine relieves certain types of headaches.
  • This property is explained by caffeine’s analgesic effect on pain and its effect on the vessels.

The effects of caffeine on the body


The effects of coffee on :

The digestive system

Caffeine stimulates gastric secretion and also stimulates the pancreas and gallbladder. Coffee is a diuretic, it does not cause stomach ulcers and increases the motor activity of the colon.


  • Consumption of caffeine helps delay sleep.
  • At high doses, it can disrupt the different phases of sleep.


  • Moderate caffeine consumption stimulates perception and attention. This effect is particularly pronounced in sleep-deprived subjects.
  • Caffeine accelerates the reaction time to a command, i.e. it reduces the time it takes for the brain to process information.
  • Caffeine improves certain memory functions by facilitating “data entry”.


  • Coffee increases the level of alertness and information processing.
  • It decreases the feeling of tiredness and drowsiness.
  • A recent French study has shown that coffee consumption, 30 minutes before driving at night, significantly reduces the risk of road accidents, without altering the quality of future sleep.

Coffee and cancer

  • Coffee protects against colon cancer ;
  • Coffee protects the liver from alcoholic cirrhosis and cancer;
  • A protective effect of coffee against cancers of the pancreas, mouth, pharynx and oesophagus is to be confirmed.
  • Caffeine and its action

The best known health effects of coffee are related to the action of caffeine on the brain.



Caffeine and theine are different molecules?


Coffee does not affect digestion?


Does caffeine have a beneficial effect on headaches?


Caffeine improves visual perception?


Usual coffee consumption in a “healthy” person leads to heart problems.


Caffeine induces a phenomenon of dependency on regular consumers?

Addiction is defined as “a behavior focused on seeking and repeatedly and compulsively taking a psychoactive substance”. However, caffeine, considered the most widely used psychoactive substance in the world, does not meet most criteria for an addictive drug.

Coffee reduces drowsiness while driving?


Caffeine increases alertness and powers of concentration?


Research is underway into the potential preventive effects of caffeine in Parkinson’s disease and type 2 diabetes. ?


Coffee contains more antioxidants than tea.?

Coffee is the beverage containing the most polyphenols, and it is these polyphenols that provide antioxidant properties to coffee.

Coffee contains vitamins and minerals.?

We find mainly vitamins B3, but also B2, B5, and B6; as well as potassium, magnesium, calcium, and sodium.

Caffeine is found in foods and beverages other than coffee.?

Caffeine is also found in tea, chocolate, sodas, energy drinks.

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