Intermittent fasting (IF) has become not just a global health and fitness trend, but a way of life.
According to Healthline: 
Intermittent fasting is an eating pattern where you cycle between periods of eating and fasting.
It does not say anything about which foods to eat, but rather when you should eat them.
Doing IF is not just for losing weight, but also for better metabolism, improving medical conditions like diabetes, more optimal brain activity, a stronger immune system, and basically living longer[2, 3, 4].
While it focuses more on when to eat, rather than what, many people still ask this big question:
Can you drink coffee or tea while intermittent fasting?
According to Dr. Akil Palanisamy, physician and author of The Paleovedic Diet:
"Autophagy is the self-cleaning process by which the body's cells break down and recycle damaged proteins and components. This is activated by intermittent fasting, but anything other than water (even black coffee) disrupts it to some extent.” 
Dr. Rhonda Patrick, a Ph.D in biomedical science and expert on nutritional health, seems to agree in this interview with Joe Rogan. She says that drinking black coffee, green tea and vitamin supplements break the fast.
On the other hand, some experts agree in saying that caffeine is okay while fasting, but only to a certain extent:
“Zero-calorie beverages are okay. As previously stated, I drink green tea in the morning for my caffeine kick while writing. If you want to drink water, black coffee, or tea during your fasting period, that’s okay. Remember, don’t overthink it – keep things simple! Track your results, listen to your body.”
"If you’re on a time-restricted fast and you’re in no-eating hours, it’s best to stick to no- or low-calorie drinks like water, coffee (with no milk) and tea. If you’re on an alternate day diet or something similar, even during low calorie hours, you can technically drink whatever you’d like — but remember, this will count against your calories. Would you rather spend 100 calories on an apple or a glass of milk? It’s your call.” 
Is having black coffee fasting? Doctors keep telling patients it is all right to have black coffee before fasting blood work (fasting sugar, fasting lipid panel).
It depends to some extent on what test is being performed, but for many tests that require fasting, intake of non-carbohydrate containing liquids a few hours before testing will not impact results. We have worked here to make 1 standard definition of “fasting” that encompasses most test requirements. We allow clear liquids (water, black coffee) up until 2 hours before a test or procedure. The definition of fasting should be clarified for all procedures in your institution if possible.
Good news - the answer is a resounding YES!!! Here are four (4) reasons why you should NOT ditch your coffee just yet:
Caffeine boosts your metabolism.
If weight loss is your primary goal for doing intermittent fasting, then this is music to the ears. There are 3 ways that caffeine boosts your metabolism:
It suppresses appetite.
According to Livestrong, caffeine can help you lose your appetite: 
In a study published in "Clinical Nutrition" in January 2009, 27 participants consumed capsaicin, which occurs naturally in hot peppers; green tea, which contains caffeine; sweet peppers; capsaicin plus green tea; or a placebo on 10 separate days. Researchers then analyzed the participants' appetite, food intake, body weight and heart rate and found that green tea consumed with or without capsaicin led to increased satiation, or fullness, and reduced calorie intake.
It keeps you in a happy disposition.
We talked about this at length in the article How does caffeine affect your mood.
It keeps you alert and attentive, eases and reduces the risk of depression, helps you get along with people better, and basically just turn you into a walking ball of sunshine.
These are the things you especially need when going through intermittent fasting!
It’s a way to treat yourself.
When doing something that’s beyond your usual rhythm, you need something to motivate you and keep you happy.
If you’re a coffee-lover, having your usual cup of joe is definitely one way to treat yourself and one piece of normalcy you can have during the “ordeal” of fasting - which isn't easy!
And just by taking some of the experts’ advice above, you’ve got nothing to lose by having your java fix!
Read our article What coffee and caffeine do to you when fasting to find out more.
Coffee, tea and other forms of caffeine are allowed in intermittent fasting, except for when they contain sugar and exceed a certain amount of calories.
Our take? Keep it to a low-calorie count and you can enjoy the benefits of caffeine and intermittent fasting altogether!
To find out how caffeine can benefit your fasting, watch this video:
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The afternoon slump would be OK if you could just lie down for a little nap. But most of us have to earn a living, and management would likely frown on anyone who went home from 2 to 4 p.m. for a siesta. Unless (a) you’re somewhere in Europe – where this is perfectly acceptable or (b) you have the total freedom to create your own schedule every day.
But what if an afternoon nap is out of the question? How can you cope with an urge to sleep after lunch?
This article suggests ways on how you can beat the afternoon slump.
It’s common knowledge that coffee brings a whole range of benefits, the most popular being that instant kick in the morning.
It’s not just coffee that can be habit-forming. The benefits of regular caffeine fix themselves can lead us to grab one cup of joe after another.
But what if one day you decide to take a break from your favorite cup?
What happens when you stop drinking coffee?
Here are some of the interesting things that could occur.
How many cups of coffee do you normally have in a day?
Two? Three? Four? More?
If you’ve read one of our articles “Here’s how much caffeine you can have in a day,” you will know that the sweet spot is 400 mg a day. That’s equivalent to 4 cups of brewed coffee.
This is the ultimate good news for coffee-lovers, right?
But what if you go beyond four cups of joe a day? What exactly will happen?