6 of 11 Brain Food #6: Yerba Mate View All < > Start again? You may also like slide show Fish Oils That Taste Good (Really!) Brew up a mug of yerba mate to beat the afternoon slump. Brazilian scientists found that yerba mate, herbal tea gleaned from a South American plant, can enhance short-term brain power. This is likely due to stimulants like caffeine. See the latest science on the surprising up—and downsides of caffeine. You can use your keyboard to see the next slide ( ← previous, → next) Snack on these superfoods to stay focused all day long Promo Subtitle Snack on these superfoods to stay focused all day long. By Matthew Kadey, R.D. Image Alt Text The 11 Best Foods for Your Brain Title Text The 11 Best Foods for Your Brain Media Folder: Media Root Diet Tips Topics: diet foods superfoods By Matthew Kadey, R.D.