What foods might cause discomfort if consumed together with coffee? Nutritionist reveals unexpected NG combination

 7:54am, 4 November 2025

Many people must have a cup of coffee to refresh themselves every morning, but do you know? Although coffee contains caffeine that can wake you up, if paired with the wrong food, it may actually cause a burden! Japanese nutritionist and food lifestyle consultant "Yuya" reminds that although coffee has many health benefits, ingesting it at the same time as certain foods can cause excessive caffeine or affect the body's absorption and metabolism.

Main ingredients and benefits of coffee

The most representative ingredient in coffee is "caffeine". It can stimulate the central nervous system, refresh the mind, improve concentration, reduce fatigue, and also has analgesic effects, so it is often used in medicines to improve headaches or fatigue.

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In addition, coffee also contains a variety of polyphenols, such as "Chlorogenic acid" acid), which is the source of the bitter taste and aroma of coffee. It also has antioxidant and antibacterial effects, helps prevent lifestyle diseases, promotes fat metabolism, and maintains a healthy weight.

Generally, drip filter or instant coffee contains about 60 mg of caffeine per 100 ml; if it is a canned or bottled product, it ranges from 30 to 90 mg, so you need to pay attention to the label.

How much is safe to drink every day? Excessive consumption may cause discomfort

Although coffee can help to wake you up, drinking too much may also cause physical discomfort. Excessive caffeine intake can cause symptoms such as heart palpitations, dizziness, anxiety, insomnia, nausea, or diarrhea.

According to the standards of various countries around the world, the recommended upper limit of daily caffeine intake for healthy adults is about 400 mg, which is equivalent to about 3 cups of ordinary coffee. However, it is recommended that the intake should be reduced for the elderly, pregnant women, or those who have experienced heart palpitations or sleep disorders with reduced metabolic function.

These foods should not be eaten at the same time as coffee!

Nutritionists remind that if some foods containing "high caffeine" are ingested at the same time as coffee, the body will absorb too much caffeine in a short period of time, increasing the risk of discomfort. One of the most common NG combinations is:

Coffee + Chocolate

Although the two taste well together, dark chocolate, especially "high cocoa chocolate", does not have low caffeine content. Generally, chocolate contains about 30 mg of caffeine per 100 grams, while high-cocoa chocolate can contain more than 100 mg. If you add a cup of 200ml coffee (about 120mg of caffeine), it may exceed the standard in a short period of time.

Coffee + Energy Drinks

The caffeine content of energy drinks is about 40 to 100 mg per 100 ml, and a 250 ml bottle may be as high as 160 mg. If consumed at the same time as coffee, it is easy to increase the heartbeat and cause dizziness or anxiety.

According to the Food Safety Commission, the risk of adults ingesting less than 200 mg at one time is low. However, if a variety of caffeinated foods such as coffee, chocolate, and energy drinks are ingested in a short period of time, this safe value may be exceeded.

If you want to drink coffee, you don’t have to worry about overdosing it. It’s safer to do so.

If you don’t want to give up coffee completely, you can choose “low-caffeine” or “diluted” products. A survey by the Japan National Life Center shows that the caffeine content of this type of product is about 70% of that of ordinary coffee, which is more friendly to people with sensitive constitutions.

At the same time, you can also avoid concentrated intake by adjusting the drinking time, such as drinking coffee in the morning and enjoying dessert or chocolate in the afternoon, with an interval of at least 2 to 3 hours.

Drink coffee smartly to achieve good health!

Coffee itself contains a variety of ingredients that are beneficial to the body. As long as you master the principle of appropriate amount and avoid eating it at the same time as high-caffeine foods, you can enjoy the aroma and refreshing effect with peace of mind. Nutritionists remind: "The key is not to quit coffee, but to know how to drink it." Drinking it in moderation, with a balanced diet and adequate rest, makes coffee a refreshing and healthy cup in your daily life.