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But even 40 mg of caffeine â about the amount in a cup of tea or a can of soda â will give most people a subtle boost. In fact, many people can detect the effects of just 15 mg of caffeine, about the amount in a single sip of strong coffee or a large cup of decaf.
I'll bet you didn't know that caffeine leaches calcium from your body. Three cups of coffee remove 45 mg of calcium. Top that with what soda does. It's not only got a load of caffeine but phosphoric acid, which blocks the absorption of calcium. And finally, watch out not to be eating too much protein. Yep, it also causes the body to lose calcium.