Is Coffee Good for You or a Burden? A Clinical Nutritionist Answers Four Key Questions

Brief (coffeeyo.com): A morning pick-me-up and an afternoon refill, coffee is now a daily drink for many workers. But is it a health drink or a burden on the body? A clinical nutritionist says the answer is not a simple yes or no—it depends on what you drink, how much, when, and whether it suits you.

Liu Shaojie, Deputy Chief Physician of the Clinical Nutrition Department at the First Affiliated Hospital of Xiamen University

A morning pick-me-up and an afternoon “refuel,” coffee has become a daily drink for many professionals. Yet though they all go by the name coffee, some are just espresso with water while others contain large amounts of milk, syrup and cream; some people feel energized after drinking, while others experience palpitations, trembling hands and insomnia. Is coffee a health drink or a burden on the body? The answer is not a simple “can drink” or “cannot drink”—the key lies in what you drink, how much, when, and whether it suits you.

Q: What are the benefits of drinking coffee in moderation?

Caffeine can temporarily block adenosine receptors in the brain and reduce drowsiness, so moderate consumption can improve alertness, attention and reaction speed, and even help exercise endurance for some people. But this effect only temporarily eases sleepiness; it cannot eliminate the fatigue and cognitive decline caused by lack of sleep. After a late night, coffee may make you feel more awake, but your judgment and ability to handle complex tasks may not be fully restored. Therefore, coffee should not be used as a “cure” for staying up late, and you should certainly not drive long distances, exercise intensely or perform high-risk operations right after drinking it.

Coffee also contains polyphenols such as chlorogenic acid. Studies have found that habitual coffee drinking is associated with lower risks of all-cause mortality and of type 2 diabetes, some liver diseases and Parkinson’s disease. But it must be stressed that “associated” is not the same as “causal.” Coffee is not medicine, nor does it mean people who do not already drink it must start for the sake of health. A balanced diet, regular exercise, adequate sleep and not smoking remain the foundation of good health.

Q: What is the difference between espresso, Americano, latte, mocha and cappuccino?

Espresso, also called Italian espresso, is the “base” of most specialty coffees. A single shot is about 30 ml, small in volume and strong in flavor, typically containing 60–75 mg of caffeine; the exact amount varies with bean type, dose and extraction method.

An Americano is espresso with water added. If the number of shots is the same, adding water only dilutes the taste and does not reduce the caffeine content. Therefore, when ordering you should pay attention to how many shots are used, not just the cup size.

A latte is made of espresso and a larger amount of milk, providing some protein and calcium, but choosing whole milk, a large size or adding syrup will increase its energy content.

A cappuccino also contains espresso, milk and milk foam, but usually less milk than a latte, with a more prominent coffee flavor. Without added sugar, its energy is generally lower than a latte of the same cup size.

A mocha can be understood as a latte with chocolate sauce added, and sometimes cream as well; it is usually the one with the highest sugar and energy content among these coffees.

Those who want to control weight, blood sugar or blood lipids can give priority to unsweetened espresso or Americano, or unsweetened small lattes and cappuccinos, and minimize added white sugar, syrup, condensed milk, cream and non-dairy creamer.

Q: How can you drink coffee in a way that is better for your health?

For most healthy adults, total daily caffeine intake should generally not exceed 400 mg, and a single dose is best kept under 200 mg. This counts all sources, including coffee, tea, cola, energy drinks, chocolate and some medications. Caffeine content varies greatly between stores, bean types and cup sizes, so the phrase “how many cups a day” is not accurate. When buying coffee, you can check the product label or ask how many shots are in a cup.

Drinking coffee on an empty stomach does not necessarily harm the stomach, but if symptoms such as acid reflux, stomach pain, nausea or palpitations appear, you should switch to drinking after meals, reduce the dose or choose decaf. Decaf is not completely caffeine-free either, and sensitive people should still be cautious.

There is no single best time to drink coffee that suits everyone. Most people do well arranging it from after breakfast to the afternoon. The metabolic rate of caffeine varies significantly between individuals. Studies have found that even consuming a high dose of caffeine up to six hours before bedtime can shorten sleep time. Therefore, it is generally recommended to stop caffeine at least six hours before sleep; those prone to insomnia or sensitive to caffeine can move that cutoff to noon. If you sleep poorly at night and then rely on coffee the next day, it is easy to fall into a vicious cycle of “insufficient sleep—drink coffee—worse sleep.”

Moderate coffee usually does not significantly dehydrate habitual drinkers, but it cannot fully replace plain water. Suddenly stopping after long-term heavy consumption may bring brief withdrawal reactions such as headache, fatigue and reduced attention; tapering off gradually is generally easier to tolerate than quitting abruptly.

Q: Who should be cautious about drinking coffee?

Pregnant women and women trying to conceive should keep total caffeine under 200 mg per day. Because caffeine can enter breast milk, breastfeeding women should drink as little coffee as possible or avoid it, otherwise infants may become irritable or experience changes in sleep.

Children and adolescents are advised not to use coffee, milk tea or energy drinks as a daily way to stay alert.

Those prone to insomnia, anxiety, palpitations, gastroesophageal reflux, or with poorly controlled blood pressure should minimize coffee intake. If persistent palpitations, chest tightness or obvious dizziness occur after drinking, stop and seek medical attention promptly.

Those taking medication who are unsure whether it interacts with coffee can first consult a doctor or pharmacist.

In addition, people with iron-deficiency anemia, those on a mainly plant-based diet, or those taking iron supplements should drink coffee 1–2 hours apart from meals or iron supplements to reduce the impact on non-heme iron absorption.

People with high blood lipids who regularly drink unfiltered coffee such as French press or Turkish coffee may consider switching to paper-filtered coffee to reduce intake of substances such as cafestol that can raise LDL cholesterol.

Source: First Affiliated Hospital of Xiamen University (Dr. Liu Shaojie), compiled by Chen Jing.

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