Coffee is one of the most popular beverages worldwide. For many people, a cup of coffee in the morning provides the boost they need to start their day, while others depend on it to stay alert during long working hours. However, drinking coffee frequently throughout the day can significantly increase your caffeine intake.

Moderate coffee consumption can be part of a balanced lifestyle for many healthy adults. Problems are more likely to occur when caffeine intake becomes excessive or when someone is particularly sensitive to its effects.

So, how much coffee is considered too much, and what can happen if you regularly exceed the recommended caffeine limit? Here's what you should know.

How Much Caffeine Can You Have in a Day?

For most healthy adults, the U.S. Food and Drug Administration (FDA) says that 400 mg of caffeine per day is an amount generally not associated with negative effects.

However, this should not automatically be interpreted as four or five cups of every type of coffee.

The amount of caffeine in coffee can vary considerably depending on the type of beans, serving size and preparation method. A large café coffee, for example, may contain substantially more caffeine than a small cup prepared at home.

It is therefore better to monitor your total caffeine intake rather than simply counting cups.

Coffee Isn't the Only Source of Caffeine

Another important point is that your daily caffeine intake doesn't come exclusively from coffee.

Tea, energy drinks, cola, chocolate and some medicines or supplements may also contain caffeine. Someone drinking three cups of coffee along with several cups of tea or an energy drink could therefore consume much more caffeine than they realize.

Checking labels can help you estimate your overall intake.

What Happens When You Drink Too Much Coffee?

Excessive caffeine can affect people differently. Some individuals can drink coffee without experiencing noticeable problems, while others develop symptoms even after relatively small amounts.

Too much caffeine may contribute to:

• Difficulty falling or staying asleep
• Restlessness or feeling jittery
• Headaches
• Increased heart rate or palpitations
• Anxiety or nervousness
• Upset stomach or nausea

If you regularly experience these symptoms after drinking coffee, reducing your caffeine intake may be worth considering.

Coffee Can Affect Your Sleep

One of caffeine's most noticeable effects is increased alertness. While this can be useful during the daytime, it may become a problem when coffee is consumed later in the day.

Caffeine can remain in the body for several hours. As a result, an afternoon or evening coffee may interfere with sleep in some people.

Poor sleep can then create another problem: you may feel tired the following morning and reach for even more coffee, creating a cycle of caffeine use and inadequate sleep.

If coffee seems to affect your sleep, consider reducing your intake later in the day.

What About Coffee During Pregnancy?

Pregnancy requires a lower caffeine limit than the general recommendation for healthy adults. It is therefore incorrect to say that every pregnant woman must completely avoid coffee unless advised to do so for an individual medical reason.

The American College of Obstetricians and Gynecologists (ACOG) advises that pregnant women keep caffeine consumption below 200 mg per day.

People who are pregnant or breastfeeding should discuss caffeine intake with their healthcare professional, particularly if they consume several caffeinated beverages each day.

Don't Stop Suddenly If You Consume a Lot of Caffeine

People who regularly consume large amounts of caffeine may experience withdrawal symptoms if they suddenly stop.

These can include headaches, tiredness, difficulty concentrating and irritability.

If you're trying to reduce a high caffeine intake, gradually cutting back may be more comfortable than stopping abruptly. For example, you can reduce serving sizes, replace one regular coffee with decaffeinated coffee, or slowly decrease the number of caffeinated drinks you consume.

Who Should Be More Careful With Coffee?

The 400 mg figure is a general guideline rather than a target everyone should try to reach.

Some people are much more sensitive to caffeine. Certain health conditions and medications may also affect how caffeine impacts the body.

If coffee repeatedly causes a racing heartbeat, significant anxiety, digestive problems, persistent sleep difficulties or other concerning symptoms, speak with a healthcare professional instead of simply trying to tolerate the effects.

How to Enjoy Coffee More Sensibly

You don't necessarily need to give up coffee altogether. Instead, pay attention to serving size, caffeine content and how your body responds.

Try to avoid using coffee as a substitute for adequate sleep. Keep track of caffeine from tea, soft drinks, energy drinks and other sources as well.

If you're consuming several coffees every day, switching some of them to decaffeinated options can help reduce overall caffeine intake without completely giving up the habit.

Bottom Line

For most healthy adults, up to 400 mg of caffeine per day is generally considered an amount not associated with negative effects, but that doesn't mean everyone can comfortably tolerate that much.

Instead of relying on a fixed number of cups, consider the caffeine content of your drinks and your total intake throughout the day. If coffee is causing insomnia, headaches, nausea, anxiety, restlessness or a rapid heartbeat, cutting back could help.

Pregnant people should generally stay below 200 mg of caffeine per day, while anyone with specific medical concerns should seek personalised advice from a qualified healthcare professional.