Unlike a cup of Joe, tea contains the amino acid theanine, which may improve attention and alertness, say Lakatos and Shames. And you’ll still get a little boost from caffeine (about 35 to 50mg per cup compared to the 100 to 140mg in a cup of coffee). Just make sure you don’t drink it too close to bedtime, caution Lakatos and Shames: “You don’t want the caffeine to affect your sleep—if you can’t get a good night’s rest your energy level will be low.”
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