Health effects of chocolate no medical or regulatory authority has approved any health claim. "Theobroma cacao", the cacao tree, produces seeds containing flavanols. The seeds have been used to make beverages for some 2000 years in Aztec, Olmec, and Maya civilizations in central and south America. The drinks were ascribed a wide variety of curative and stimulant properties, unsupported by experimental evidence. In the 19th century, chocolate as a solid was invented, and milk and sugar were added to create milk chocolate, high in fat and sugar. Doubtful research, sometimes funded by the chocolate industry, has at times made suggestions of possible health benefits
Dresden Botanical Garden unusual "Quercus phellos" as well as "Corydalis nobilis", "Hamamelis", rhododendrons, magnolias, and so forth; a systematic section; an alpine garden collecting a variety of European high mountain plants, including gentian ("Gentiana"), species of saxifrage ("Saxifraga"), "Dianthus caryophyllus", numerous cruciferous plants and primroses; and a garden that contains poisonous, curative, and medicinal plants. The garden also contains five greenhouses of about 1,000 m² total area, containing some 3,000 species, as well as an aquatic greenhouse for "Victoria cruziana" and plants from tropical America including "Ananas comosus", "Tillandsia usneoides", "Theobroma cacao", epiphytic bromeliads, etc. The Great Tropical House (Paläotropis) contains tropical flora