Coffee -  5 foods to improve memory - IMAGE - Women's Health & Fitness

Your daily latte or long black may be keeping your brain in shape says French research, which shows women over 65 who drink three or more cups of coffee a day have better memory function. "Caffeine acts as a mild stimulant to the brain and nervous system, making you feel more alert," says Saxelby. "But if you overdo it, it can make you irritable, anxious, interfere with sleep and leave you with an upset stomach. Aim for no more than 300 mg caffeine a day, which is equivalent to three or four cups of instant coffee or two cups percolated or espresso a day."

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