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  • Writer's pictureHema Chakraborty

Is black coffee safe: Can we consume it daily?

Updated: Nov 2, 2022

A common eating pattern is called intermittent fasting cycles between periods of eating and fasting.

According to research, intermittent fasting may help people lose weight and lower their chance of developing certain chronic diseases like heart disease, diabetes, and Alzheimer's disease.

If you're new to intermittent fasting, you might be wondering if you can have coffee while you're fasting.

This blog will clarify whether or not coffee is permitted during an intermittent fast.

Coffee won't end your fast.

It is doubtful that moderate use of liquids with extremely few or no calories will significantly interfere with your fast.

A cup of black coffee (240 ml) has only 3 calories, very little fat, protein, and trace minerals.

The nutrients in 1-2 cups (240-470 ml) of black coffee are typically insufficient for most people to cause a major metabolic alteration that would end a fast.

Some claim that coffee reduces appetite, making it simpler to maintain your fast over time. However, there is no scientific evidence to support this.

Coffee might increase the advantages of fasting.

Unexpectedly, coffee may improve a lot of the advantages of fasting.

These include enhanced cognitive performance as well as decreased risk of heart disease, blood sugar, and inflammation.

Metabolic advantages

Many diseases have chronic inflammation as their primary cause. Both coffee consumption and intermittent fasting may help lower inflammation, according to research.

According to some studies, drinking more coffee may lower your risk of developing metabolic syndrome, a condition that is characterized by high blood pressure, excess body fat, excessive cholesterol, and elevated blood sugar levels.

Coffee consumption has also been linked in studies to a lower incidence of type 2 diabetes. Additionally, drinking up to three cups (710 ml) of coffee daily is linked to a 19% lower risk of dying from heart disease.

Mental health

Intermittent fasting's ability to improve brain function and guard against age-related neurological illnesses is one of the main reasons it has become so popular.

It's interesting to note that coffee shares and enhances many of these advantages.

Regular coffee drinking is linked to a lower risk of mental decline, Alzheimer's disease, and Parkinson's disease, just as intermittent fasting.

Your body produces ketones, which are related to better brain function, as energy from fat when you're fasting. Early studies suggest that caffeine in coffee may also encourage the synthesis of ketone bodies.

Through enhanced autophagy, intermittent fasting may potentially promote the health of the brain.

Your body uses autophagy to replace damaged cells with healthy ones. According to research, it might protect against mental decline brought on by aging.

Additionally, a mouse study linked coffee consumption to noticeably higher autophagy.

Therefore, incorporating little amounts of coffee into your intermittent fasting plan may be extremely useful.

Adding ingredients can lessen the advantages of fasting.

While coffee by itself is unlikely to break your fast, additional additions might.

Filling your cup to the brim with high-calorie additives like milk and sugar can interfere with intermittent fasting and limit the advantages of this eating regimen.

According to several well-known media and health sources, you won't need to break your fast as long as you consume between 50 and 75 calories per fasting window. However, there is no scientific support for these assertions.

Instead, while fasting, you should consume as few calories as you can.

For instance, during your fasting windows, lattes, cappuccinos, and other coffee beverages high in calories or sweetened should be avoided.

Black coffee is optimal, but if you must add something, 1 teaspoon (5 ml) of heavy cream or coconut oil would be good choices because they won't drastically change your blood sugar levels or overall calorie intake.

Other considerations

Caffeine is included in roughly 100 mg of every 240 ml of coffee.

Too much coffee consumption may cause negative effects like heart palpitations and brief spikes in blood pressure.

According to one study, drinking a lot of coffee—up to 13 cups (3.1 liters) per day—raises fasting insulin levels and may cause a temporary decline in insulin sensitivity.

You should limit your coffee consumption if you're utilizing intermittent fasting to raise your fasting insulin levels or increase your insulin sensitivity.

Additionally, consuming too much coffee may impair the quality of your sleep. Your metabolic health can be harmed over time by a lack of sleep, which could offset the advantages of intermittent fasting.

The majority of studies show that consuming up to 400 mg of caffeine daily is probably safe for most people. This is equivalent to 3 to 4 cups (710 to 945 ml) of ordinary coffee per day.

Can you have coffee during a fast?

Coffee consumption during a fast is ultimately a matter of personal preference.

There is no reason for you to start drinking coffee if you dislike it or don't already. A diet including a lot of wholes, healthy foods will provide you with many of the same health advantages.

But there's no need to give up if a hot cup of coffee seems to ease your fast a little. Just keep in mind to use moderation and to stay away from unnecessary additives.

If you discover that you're drinking too much coffee or struggling to fall asleep, you might wish to reduce your intake and concentrate just on intermittent fasting.


During times of fasting, you can consume little amounts of black coffee because it has very few calories and won't likely end your fast.

In fact, coffee may increase the advantages of IF, such as less inflammation and enhanced cognitive performance.

However, you want to avoid adding too many calories.

As excessive consumption might be harmful to your health, it's also advisable to monitor your intake.


How much caffeine is in coffee?

A cup of coffee contains about 95mg of caffeine on average. With precise coffee brewing, we dissolve (or extract) the same proportion of coffee regardless of the brewing technique. That is, while the concentration of flavor will vary, the total quantity of caffeine should be pretty consistent whether your finished cup is a 30ml espresso or a 250ml filter-brewed coffee.

Is there a difference in caffeine levels between light and dark-roasted coffee?

Does coffee have more caffeine than tea?

How many cups of coffee can you consume each day?

Can you drink coffee when pregnant?

Is coffee healthy?

How many calories are there in a cup of coffee?

Is coffee a laxative?

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