MYTH: Drinking coffee increases a blood pressure.

Yes, that’s true, caffeine (contained in coffee) can increase blood pressure but only for a short time. After one or two hours it will come back on a normal level. Coffee is not responsible for long-term high blood pressure [1].

MYTH:  Drinking coffee increases the risk of osteoporosis

Yes, actually excessive intake of caffeine can slightly decrease a calcium absorption. However, studies established that moderate amount of coffee has no negative effect on bone mass [1]. If you are still  afraid of it, I recommend you to drink coffee with milk.

MYTH:  Coffee with milk is not absorbed well.

Yes, if you drink coffee with cow-milk and you are lactose intolerant. But if you are healthy, you should not have any problems.  According to Doc.MUDr. Pavel Kohout (2010) drinking coffee with milk or food can slow the absorption of caffeine and delay its stimulative effects. According to study of Duarte GS. a Farah A. (2011) milk can affect the bioavailability of chlorogenic acid.  This substance is one of many antioxidants that are contained in coffee.

Do not be affraid of drinking coffee with milk, added milk can increase calcium intake[4].

MYTH:  Drinking coffee causes dehydration.

Studies established that caffeine has slight diuretic effect. These effects can cause urination, especially for the first 2 hours after drinking coffee, but not for 24 hours. In addition, after 3 to 5 days of regular coffee consumption, your body begins to develop tolerance. Coffee just as water, tea or soup, contributes to daily water intake [1].

The health problems associated with drinking coffee is rather caused by bad eating habits: For example, many people drink coffee instead of breakfast. If you miss breakfast, you increase the risk of frequent nibbling during a day.

Coffee has a negligible energy value, but by adding cream or sugar, its energy value increases significantly. Drinking coffee is also often accompanied by cakes and desserts, or even smoking cigarettes that are definitely not suitable for healthy lifestyle. Regular drinking coffee with whipped cream and consumption of dessert can support unwanted gain weighting.




[1]       DUYFF, Roberta Larson. Academy of Nutrition and Dietetics Complete Food and Nutrition Guide, 5th Ed. 5th edition. New York: Houghton Mifflin Harcourt, 2017. ISBN 978-0-544-52059-2.

[2]          DOC. MUDR. PAVEL KOHOUT. Tisková konference – Káva – životabudič nebo zabiják? | Institut kávy. [online]. 2014 [vid. 2018-06-08]. Dostupné z:

[3]          DUARTE, Giselle S. a Adriana FARAH. Effect of simultaneous consumption of milk and coffee on chlorogenic acids’ bioavailability in humans. Journal of Agricultural and Food Chemistry [online]. 2011, 59(14), 7925–7931. ISSN 1520-5118. Dostupné z: doi:10.1021/jf201906p

[4]          Scientific Opinion on Dietary Reference Values for calcium. EFSA Journal [online]. nedatováno, 13(5), 4101. ISSN 1831-4732. Dostupné z: doi:10.2903/j.efsa.2015.4101




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