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Home > Living Well > Health Library > Guaraná for Weight Control
Some dieters say that guaraná helps improve weight loss results.
The herb guaraná contains caffeine and the closely related alkaloids theobromine and theophylline; these compounds may curb appetite and increase weight loss. Caffeine's effects are well known and include central nervous system stimulation, increased metabolic rate, and a mild diuretic effect.1 In a double-blind trial, 200 mg per day of caffeine was, however, no more effective than a placebo in promoting weight loss.2 Because of concerns about potential adverse effects, many doctors do not advocate using caffeine or caffeine-like substances to reduce weight.
Guaraná contains substances similar to caffeine that could be responsible for caffeine-like responses in the body, including central nervous system stimulation, increased metabolic rate, and a mild diuretic effect.3 There is no research demonstrating guaraná is effective for weight loss on its own.
As with any caffeinated product, guaraná may cause insomnia, trembling, anxiety, palpitations, and urinary frequency.4 Guaraná should be avoided during pregnancy and breast-feeding.
Certain medicines interact with this supplement.
Guaraná (Paullinia cupana) is a plant with a high caffeine content. Combining caffeine drug products and guaraná increases caffeine-induced side effects.
Last Review: 05-23-2015
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