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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.
Sodas such as Diet Mountain Dew contain up to 55 mg of caffeine in a can, and the majority of diet sodas have about 40 mg of caffeine.Just to give you a comparison, a cup of espresso contains about 100 mg of caffeine. I mention this because there has been a recent focus on caffeineâs effect on insulin sensitivity.he short answer is that drinking diet soda does not cause a rise in blood sugar level. Some studies have linked artificial sweeteners, such as the aspartame (NutraSweet) used in many diet sodas, with weight gain. Weight gain increases insulin resistance, which leads to an increase in blood sugar level.