1 chamomile tea Mariha-kitchen-Thinkstock.jpg

Thinkstock

Research has shown that luteolin in chamomile tea improves cognitive functioning when you’re awake. Loss of memory was reversed in older mice fed with a luteolin-rich diet. A separate study found that people who drank green tea before a cognitive functioning test performed significantly better than those who drank a placebo. Higher consumption was associated with a lower prevalence of cognitive impairment.