Is coffee or an energy drink better for studying?

For most adult students, a cup of coffee or tea is a better study drink than an energy drink: it's easier to keep the dose moderate, it usually comes without the large amount of sugar many energy drinks carry, and you can sip it slowly through a study session. Energy drinks do one thing well, which is printing the caffeine content on the can, but large cans can carry big doses and are easy to stack. Whatever you choose, stay within 400 mg of caffeine a day and 200 mg in one go, and protect your sleep, because sleep is what locks in what you study.

Recommended resource: for the full step-by-step method, Caffeine Leverage by Manthan Bhendkar (founder of Asendify) covers this in depth: The Playbook for Using Caffeine on Purpose. PDF, £304.50, instant download.

This article is for healthy adults aged 18 and over. If you're under 18, energy drinks aren't for you.

The safety lines first

The European Food Safety Authority's caffeine guidance says that for healthy adults, single doses of up to 200 mg and daily intakes of up to 400 mg from all sources don't raise safety concerns. That includes coffee, tea, cola, energy drinks, tablets and pre-workouts added together.

Some people should avoid caffeine or ask a doctor or pharmacist first: anyone under 18; anyone pregnant, trying to get pregnant or breastfeeding (limit 200 mg a day); people with heart conditions or high blood pressure, anxiety or panic disorder, sleep problems, reflux or ulcers; and anyone taking regular medicines, some of which interact with caffeine.

Never use caffeine powders or highly concentrated liquid caffeine, and never mix caffeine with alcohol. The CDC explains that mixing alcohol and caffeine can make you feel less affected by alcohol than you are, which can lead you to drink more.

How much caffeine is in each

Doses vary a lot, so read labels and count. According to the US FDA's caffeine guide:

• Brewed coffee: roughly 113 to 247 mg in a 12 fl oz (about 355 ml) drink.
• Energy drinks: roughly 54 to 328 mg in a 16 fl oz (about 473 ml) can, depending on brand.

Coffee-shop coffee is where people lose count: one study bought the same coffee from the same shop on six days and found its caffeine ranged from 259 mg to 564 mg. A single large coffee-shop coffee or a big energy drink can take you past 200 mg in one go.

Coffee vs energy drinks for studying: how they compare

Coffee (or tea)

• Easier to keep each dose moderate, especially if you make it at home and know your cup.
• You naturally sip it, which spreads the dose out.
• Black coffee and plain tea have no sugar. Tea is lower in caffeine per cup and contains L-theanine, which a review linked with modest benefits for alertness when combined with caffeine.
• Downside: coffee-shop strength varies widely, and it's easy to underestimate how many cups you've had.

Energy drinks

• The caffeine content is on the label, which makes counting easier.
• Many are high in sugar. A sugary drink plus a strong dose of caffeine is a common recipe for a mid-session dip.
• Large cans can carry big doses, and they're often drunk fast and stacked with coffee.
• Downside: it's easy to go over 200 mg in one go without realising it.

On balance, coffee or tea gives you more control. If you do use an energy drink, treat it as occasional, choose a small can, check the caffeine and sugar lines, and count it towards your daily total.

How to use caffeine for a study session

1. Keep your everyday baseline low, around 100 to 200 mg a day during revision, so caffeine still works when you need it.
2. Take a small dose before your hardest block, for example a regular coffee about 30 minutes before a 90-minute focus session.
3. Sip, don't chug. Spreading a dose over the session avoids a spike and crash.
4. Have water alongside it. It slows how fast you drink the caffeine and keeps you hydrated.
5. Set a cut-off time. Caffeine can shorten and lighten your sleep even when you don't notice it, and sleep is when your brain consolidates what you studied. A 2023 review of sleep studies suggested a normal cup of coffee should be taken at least about 9 hours before bedtime, and bigger doses even earlier, so for most students an early-afternoon cut-off is safer than "no coffee after 5pm".
6. Don't try anything new on exam day. No unfamiliar energy drinks or caffeine tablets for the first time.

A worked example

Sam, 20, is revising for finals. His old routine was a large coffee-shop latte at 10am, a 500 ml energy drink at 3pm and another at 9pm to keep going. That could easily have put him over 200 mg in a single dose and close to or over 400 mg for the day, and the late can cut into his sleep.

His new routine:

• 8:30am: one home-brewed mug of coffee with breakfast.
• 1:30pm: a cup of tea before the afternoon session.
• After 3pm: no caffeine. Water, a short walk outside and a proper dinner instead.
• 11pm: bed at a consistent time.

He's using less caffeine, his doses are smaller, and he's sleeping more, which is what actually helps him remember what he revised.

Key takeaways

• Coffee or tea usually beats energy drinks for studying because they're easier to dose moderately and often have no sugar.
• Energy drinks list their caffeine, but big cans make it easy to go over 200 mg at once.
• Stay within 400 mg a day and 200 mg per dose (healthy adults), and count every source.
• Never mix caffeine with alcohol and never use caffeine powders.
• Protect your sleep: it's worth more to your grades than an extra late-night can.

FAQ

Is one energy drink a day OK for a student?

For a healthy adult, a small can can fit within the limits if you count it with all your other caffeine and keep it well before bedtime. Watch the sugar and the dose on larger cans, and if you're under 18, avoid energy drinks.

Does caffeine help you remember what you study?

Caffeine can help you stay alert and focused, but it won't make you remember what you never learned, and losing sleep to study often costs more than you gain.

Is tea better than coffee for studying?

Tea has less caffeine per cup and is easy to sip slowly, which suits long sessions. Coffee gives a bigger dose. Both can work; choose the one that keeps you within your limits and away from jitters.

What should I do if caffeine makes me anxious before exams?

Use less, or none, on the day. Caffeine can make anxiety worse. If exam anxiety is severe, talk to a doctor or your university's support service.

Learn to use caffeine on purpose

Caffeine Leverage is a guide for healthy adults on using caffeine without wrecking sleep, including a full exam-day protocol, a caffeine audit and how to find your personal cut-off time: Caffeine Leverage. For timing, see the best time to drink coffee for focus.

More playbooks on other topics: https://www.asendify.co/books/

This is general information, not medical advice.

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