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Questions About Natural Products

Type O and Yerba Mate


I'm an O+ who quit drinking coffee and started drinking Yerba Mate. Never felt better. Soothes my stomach. Is it advisable?


Yerba mate, or Ilex paraguariensis is a South American holly tree that provides the leaves and stems from which a popular hot drink is brewed. In traditional cultures the tea is usually drunk from a hollowed out gourd which can be lavishly decorated with silver, or aluminum or just left plain. Yerba mate means, in fact, "gourd tea." The straw-like utensil with which the tea is drunk is called a "bombilla."

It is used in popular medicine and employed in commercial herbal preparations as a stimulant to the central nervous system, a diuretic, and an antirheumatic (1). The plant also has a considerable amount of antioxidant activity. (2)

Arguments have been raised as to whether Yerba Mate is high in caffeine -or whether the particular xanthine in Yerba Mate, given the name 'matteine' has a different action on the body. Since many people feel that Yerba Mate enhances their sleep, this may well be true.

Studies have also shown that the plant does have the effect of dropping the 'repiratory quotient' indicating a rise in the proportion of fat oxidized. This appears to indicate that the plant has some potential in the treatment of obesity. (3)

Yerba mate also appears to block the oxidation of the so-called 'bad cholesterol" or LDL (5)

On the down-side, there is some evidence that mate drinking may be associated with increased risks of aero-digestive cancers (4) though this may be an interaction between mate and other factors such as alcohol or tobacco smoking.

Can I make it a recommendation? Not really. Though I suspect that an occcasional cup is fine as long as one controls for other lifestyle issues, such as excessive use of alchohol, or smoking.

1. Gosmann, G., Schenkel, E.P. and Seligmann, O.; A New Saponin from Mate, Ilex Paraguarensis, J.Nat.Pbod. 52(6), 1367 (1989)

2.Schinella GR, Troiani G, Davila V, de Buschiazzo PM, Tournier HA. Antioxidant effects of an aqueous extract of Ilex paraguariensis. Biochem Biophys Res Commun. 2000 Mar 16;269(2):357-60.

3. Phytomedicine 1999 Oct;6(4):231-8 Thermogenic effects of commercially available plant preparations aimed at treating human obesity. Martinet A, Hostettmann K, Schutz Y

4. Epidemiology 1994 Nov;5(6):583-90 Mate, coffee, and tea consumption and risk of cancers of the upper aerodigestive tract in southern Brazil. Pintos J, Franco EL, Oliveira BV, Kowalski LP, Curado MP, Dewar R

5. Gugliucci A, Stahl AJ. Low density lipoprotein oxidation is inhibited by extracts of Ilex paraguariensis. Biochem Mol Biol Int. 1995 Jan;35(1):47-56.

The Ask Dr. D'Adamo internet advice column ran from 1996 to 2009, at which time Dr. D'Adamo's teaching and programming responsibilities no longer allowed him to devote time and resources to directly answering visitor questions. However we've recently reorganized this treasure-trove of material and made it again available to his readership. He occasionally posts new entries. These are marked with a NEW tag.

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