Stimulant du système nerveux central, la caféine est un alcaloïde issu du café que l’on retrouve également dans le thé et certaines boissons.
Est-il bon ou mauvais de consommer de la caféine?
Jugez-en par vous même.
- En plus d’augmenter la progestérone dans le sang, la caféine protège contre certains types de cancer causés par les radiations, les produits chimiques, les virus et l’oestrogène;
- Plusieurs études démontrent que le café, le thé et la caféine ont un effet protecteur contre le cancer du sein;
- Les buveurs de café sont moins touchés par les maladies affectant la glande thyroïde, y compris le cancer;
- La caféine protège le foie contre les toxines, y compris l’alcool et l’acétaminophène (Tylenol), les enzymes sériques et d’autres dommages;
- Les buveurs de café ont un taux inférieur de cadmium dans les tissus dû à l’ébullition qui élimine les métaux lourds contenus dans l’eau;
- La caféine réduit l’agrégation plaquettaire et contribue à l’absorption de la sérotonine;
- Le café pris pendant un repas aide à prévenir une surabsorption de fer par l’organisme;
- Le café (ou la caféine) réduit les risques de développer la maladie de Parkinson;
- La caféine arrête la production de radicaux libres par l’inhibition de la xanthine oxydase;
- La caféine aide à réduire la production de potassium sérique après l’exercice, stabilise les plaquettes et aide à réduire la production de thromboxane;
- Le café fournit des quantités importantes de magnésium et d’autres nutriments, dont la vitamine B1;
- Tout comme la niacine, la caféine inhibe l’apoptose (auto-destruction des cellules induite par le stress) sans interférer avec le renouvèlement cellulaire normal;
À NOTER : Bien qu’il ait été démontré qu’un retard de croissance prénatal pourrait être causé par l’ingestion d’une trop grande quantité de caféine, cet effet peut être renversé en ajoutant du sucre à son alimentation.
Il ne vous reste plus qu’à vous préparer un bon café!
À votre santé!
Sources et références:
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Pharmacol Biochem Behav 2000 May;66(1):39-45. Caffeine-induced increases in the brain and plasma concentrations of neuroactive steroids in the rat. Concas A, Porcu P, Sogliano C, Serra M, Purdy RH, Biggio G.
Cancer Res 1998 Sep 15;58(18):4096-101. Inhibition of lung carcinogenesis by black tea in Fischer rats treated with a tobacco-specific carcinogen: caffeine as an important constituent. Chung FL, Wang M, Rivenson A, Iatropoulos MJ, Reinhardt JC, Pittman B, Ho CT, Amin SG.
Cancer Lett 1991 Mar;56(3):245-50. Inhibition by caffeine of ovarian hormone-induced mammary gland tumorigenesis in female GR mice. VanderPloeg LC, Welsch CW.
Breast Cancer Res Treat 1991 Nov;19(3):269-75. Caffeine inhibits development of benign mammary gland tumors in carcinogen-treated female Sprague-Dawley rats. Wolfrom DM, Rao AR, Welsch CW.
Cancer 1985 Oct 15;56(8):1977-81. The inhibitory effect of caffeine on hormone-induced rat breast cancer. Petrek JA, Sandberg WA, Cole MN, Silberman MS, Collins DC.
Nutr Cancer 1998;30(1):21-4. Association of coffee, green tea, and caffeine intakes with serum concentrations of estradiol and sex hormone-binding globulin in premenopausal Japanese women. Nagata C, Kabuto M, Shimizu H.
J Environ Pathol Toxicol Oncol 1992; 11(3):177-89. Caffeine, theophylline, theobromine, and developmental growth of the mouse mammary gland. VanderPloeg LC, Wolfrom DM, Rao AR, Braselton WE, Welsch CW.
J Environ Pathol Toxicol Oncol 1994;13(2):81-8. Enhancement by caffeine of mammary gland lobulo-alveolar development in mice: a function of increased corticosterone. Welsch CW, VanderPloeg LC. Previously we have reported that the stimulatory effect of caffeine on lobulo-alveolar development in the mammary glands of female Balb/c mice is not due to a direct action of the drug on the mammary gland but appears to be due to a caffeine-induced alteration of a yet to be defined systemic physiological process (VanderPloeg et al., J Environ Pathol Toxicol Oncol 11:177-189, 1992). “In the present study, we administered caffeine (via the drinking water, 500 mg/L) to ovariectomized, estrogen- and progesterone-treated Balb/c mice. After 30 days of caffeine treatment, a significant (p < 0.001) enhancement of lobulo-alveolar development in the mammary glands of the hormone-treated mice, compared with hormone treated control mice, was observed.”
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Br J Nutr 1999 Aug;82(2):125-30. Inverse association between coffee drinking and serum uric acid concentrations in middle-aged Japanese males. Kiyohara C, Kono S, Honjo S, Todoroki I, Sakurai Y, Nishiwaki M, Hamada H, Nishikawa H, Koga H, Ogawa S, Nakagawa K
Cancer Res 1997 Jul 1;57(13):2623-9. Effects of tea, decaffeinated tea, and caffeine on UVB light-induced complete carcinogenesis in SKH-1 mice: demonstration of caffeine as a biologically important constituent of tea. Huang MT, Xie JG, Wang ZY, Ho CT, Lou YR, Wang CX, Hard GC, Conney A.H.
Biol Neonate 1981;40(3-4):196-8. The effects of maternal carbohydrate (sucrose) supplementation on the growth of offspring of pregnancies with habitual caffeine consumption. Dunlop M, Court JM, Larkins RG.
JAMA 2000 May 24-31;283(20):2674-9. Association of coffee and caffeine intake with the risk of Parkinson disease. Ross GW, Abbott RD, Petrovitch H, Morens DM, Grandinetti A, Tung KH, Tanner CM, Masaki KH, Blanchette PL, Curb JD, Popper JS, White LR.
Gen Pharmacol 1996 Jan;27(1):167-70 The influence of antagonists of poly(ADP-ribose) metabolism on acetaminophen hepatotoxicity. Kroger H, Ehrlich W, Klewer M, Gratz R, Dietrich A, Miesel R.
Carcinogenesis 1998 Aug;19(8):1369-75. The coffee-specific diterpenes cafestol and kahweol protect against aflatoxin B1-induced genotoxicity through a dual mechanism. Cavin C, Holzhauser D, Constable A, Huggett AC, Schilter B.
Am J Epidemiol 1994 Apr 1;139(7):723-7. Coffee and serum gamma-glutamyltransferase: a study of self-defense officials in Japan. Kono S, Shinchi K, Imanishi K, Todoroki I, Hatsuse K.
Carcinogenesis 1996 Nov;17(11):2377-84 Placental glutathione S-transferase (GST-P) induction as a potential mechanism for the anti-carcinogenic effect of the coffee-specific components cafestol and kahweol. Schilter B, Perrin I, Cavin C, Huggett AC
J Nutr 1999 Jul;129(7):1361-7. Teas and other beverages suppress D-galactosamine-induced liver injury in rats. Sugiyama K, He P, Wada S, Saeki S
Nutr Cancer 1999;33(2):146-53. Effects of oral administration of tea, decaffeinated tea, and caffeine on the formation and growth of tumors in high-risk SKH-1 mice previously treated with ultraviolet B light. Lou YR, Lu YP, Xie JG, Huang MT, Conney AH.
Ind Health 2000 Jan;38(1):99-102. Effects of coffee consumption against the development of liver dysfunction: a 4-year follow-up study of middle-aged Japanese male office workers. Nakanishi N, Nakamura K, Suzuki K, Tatara K.
Biochim Biophys Acta 1992 Dec 15; 1175(1):114-22. Caffeine promotes survival of cultured sympathetic neurons deprived of nerve growth factor through a cAMP-dependent mechanism. Tanaka S, Koike T.
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