Caffeine provides no nutritional value on its own. It’s tasteless, so you don’t necessarily know if it’s in your food either. Even some medications may contain caffeine without your knowledge.
This ingredient almost always causes some symptoms. At a minimum, you may feel more energetic, but over time, too much caffeine may cause withdrawal symptoms. According to the Mayo Clinic, it’s safe for most healthy adults to consume up to 400 milligrams of caffeine per day. Keep in mind that a standard-size cup of coffee is eight ounces. If you’re using a mug or getting your fix at a coffee house, chances are you’re drinking 16 ounces or more, so reading labels is important.
As you consume the same amount of caffeine on a daily basis, your body develops a tolerance to it. Other factors like your age, body mass, and overall health can determine your tolerance to caffeine, too. If you want to decrease the amount of caffeine you take, it’s best to decrease your consumption slowly.