Coffee: how much you can drink and what adds calories
There are three questions about coffee, and they are different: how much caffeine is safe, does coffee harm your health, and why a latte with syrup costs as much as a full meal. The first has a numerical answer, the second a cautious one, and the third an arithmetic one—and it is the latter that most often turns out to be practically important.
How much caffeine
The generally accepted benchmark for a healthy adult is up to 400 mg of caffeine per day, and no more than about 200 mg at one time. For pregnant women, the benchmark is lower—around 200 mg per day, and this issue should be discussed with a doctor.
| Drink | Caffeine, approximate |
|---|---|
| Espresso, 30 ml | 60–80 mg |
| Americano, double espresso | 120–160 mg |
| Cappuccino, latte with one shot | 60–80 mg |
| Filter coffee, 250 ml | 80–120 mg |
| Instant, cup | 60–80 mg |
| Black tea, cup | 40–50 mg |
| Can of cola | 30–40 mg |
| Energy drink, 250 ml | about 80 mg |
The values are approximate: the content depends on the variety, grind, extraction time, and serving size. Regarding the drinks in the last two rows, see the articles on soda and energy drinks.
Where the calories in coffee are
Black coffee by itself is 2–5 kcal per cup, which is practically zero. Everything else comes from additives:
- Milk. A 300 ml latte with whole milk is about 150–180 kcal.
- Syrup. One serving is about 20 g of sugar, around 80 kcal.
- Sugar. Two spoons are about 40 kcal, and they rarely make it into a food diary.
- Whipped cream and toppings. These easily add another hundred.
Bottom line: a seasonal drink with syrup and whipped cream costs 400–500 kcal—like a full meal, but without satiety. This is the same mechanism as with juices and soda, analyzed in the article on juices.
Practical conclusion: if you are counting calories, coffee drinks are one of the most frequent unrecorded items, along with alcohol. Regarding the mechanism, see the article on calorie counting apps.
Does coffee dehydrate
Caffeine has a mild diuretic effect, but the volume of liquid in the cup offsets it. In people accustomed to coffee, the effect is even weaker due to adaptation. Coffee in moderate amounts counts toward the total volume of fluid consumed per day—more on this in the article about water.
Who should limit it
- Those with sleep disorders. Caffeine is eliminated slowly: half of the dose taken remains in the body after several hours, so coffee after lunch affects the night more than it seems. The link between sleep, appetite, and weight is in the article about sleep deprivation.
- Those with anxiety and heart rhythm disorders—this is a question for a doctor, not a general recommendation.
- Those with reflux and gastritis may find that coffee exacerbates symptoms; this is checked by observation.
- During pregnancy—the benchmark is lower than the general one and should be discussed with a doctor.
What to do in practice
- Count caffeine from all sources, including tea, cola, and energy drinks.
- Move your last cup to the first half of the day if your sleep is suffering.
- Look at the additives, not the coffee. Black coffee has nothing to do with the caloric content of your diet; syrup does.
- Order with higher-fat milk, but in a smaller volume, if taste is important: 200 ml instead of 400 makes more of a difference than the choice of milk.
Frequently asked questions
- How much coffee can you drink per day?
- The generally accepted benchmark for a healthy adult is up to 400 mg of caffeine per day and no more than about 200 mg at a time. This is approximately three to four cups of filter coffee or two double americanos.
- How many calories are in coffee?
- In black coffee—2–5 kcal per cup. Calories come from additives: a 300 ml latte with whole milk is about 150–180 kcal, a serving of syrup is about 80, and a drink with whipped cream and toppings can easily reach 400–500.
- Does coffee dehydrate?
- No. Caffeine has a mild diuretic effect, but the volume of liquid in a cup offsets it, and in people accustomed to coffee, the effect is even weaker. Coffee counts toward the total volume of fluid consumed during the day.
- Why does coffee after lunch interfere with sleep?
- Caffeine is eliminated slowly: a significant portion of the dose remains in the body several hours later. If sleep is affected, it makes sense to move the last cup to the first half of the day.
- How much caffeine is in tea and cola?
- A cup of black tea contains about 40–50 mg, a can of cola contains 30–40 mg, and a 250 ml energy drink contains about 80 mg. When calculating daily caffeine intake, these should be considered along with coffee.
Read next
- Energy drinks: what's in the can and where the effect comes from — The composition of an energy drink looks impressive: taurine, glucuronolactone, inositol, B vitamins, and guarana extract.
- Tea: how much caffeine is in it and what is known about its benefits — Black, green, oolong, and white teas are all the same leaf from the same plant, differing only in the degree of oxidation.
- Soda and its "zero": what changes when sugar is removed — The difference between regular soda and its "zero" version comes down to one line in the ingredients: a sweetener instead of sugar.
This article is for general information. It is not medical advice, a diagnosis, or a prescription for treatment or a diet, and it does not replace a consultation with your doctor. If you have a health condition, are pregnant, take medication, or follow a diet prescribed to you, decisions about food belong with your doctor.
Figures from regulations, guidelines and studies are given as they stood when this article was prepared and may since have changed; check them against the primary sources. This article is not advertising, an offer, or individual advice, and neither the author nor the site owner is responsible for decisions taken on the basis of it.