Can You Drink Water While Fasting? Everything You Need to Know

Fasting has become increasingly popular in the UK, whether for weight loss, health benefits, or religious reasons. But one common question that keeps popping up is: can you drink water while fasting?

Let’s be honest—there’s a lot of confusion out there. Some people believe all food and drink must be avoided, while others say water is fine. So, what’s the truth?

In this guide, we’ll break it all down clearly and simply. Whether you’re doing intermittent fasting, a 24-hour fast, or observing Ramadan, you’ll find everything you need to know about drinking water during a fast.

At its core, fasting simply means going without food for a set period of time. There are different types of fasting methods, including:

• Intermittent fasting (e.g., 16: 8 or 5: 2 method)
• 24-hour fasts
• Alternate-day fasting
• Religious fasting (such as during Ramadan or Lent)

Each type has its own rules, but most involve a period when no food is consumed. What about liquids, though—specifically water?

The short answer: Yes, in most cases, you can and should drink water while fasting.

In fact, staying hydrated is not just allowed during most types of fasts—it’s essential. The only exception is during dry fasts, such as certain religious fasts like those observed during the daylight hours of Ramadan , where neither food nor water is consumed.

For all other fasting types, plain water does not break a fast. It has no calories, sugars, or nutrients that would interfere with the process of fasting.

Let’s take a closer look at different fasting types and what the guidelines are around drinking water.

Yes, you can drink water. In intermittent fasting, you have “eating windows” and “fasting windows.” During the fasting periods, water is not only allowed but encouraged to keep you hydrated and help with hunger.

Yes, drink water freely. If you’re going for longer fasts (e.g., 24 hours or more), drinking water is absolutely essential. Not drinking enough could lead to headaches, fatigue, or even dizziness.

Depends on the time. During Ramadan, Muslims fast from sunrise to sunset, which includes refraining from water. However, once the sun sets, it’s important to rehydrate thoroughly.

Tip: After breaking the fast in the evening, make sure to drink enough water to stay hydrated until the next sunrise.

No, water is not permitted. This type of fasting is stricter and usually done for religious or spiritual reasons. It’s not recommended for long durations due to the risk of dehydration.

Drinking enough water is vital to how your body functions—especially during a fast when you’re not getting hydration from food.

Here’s why staying hydrated is a must:

• Boosts energy levels : Water helps combat fatigue, especially in the early stages of a fast.
• Reduces hunger : Sometimes what we think is hunger is actually dehydration. A glass of water can help you feel full.
• Flushes out toxins : Your body continues detoxifying even during a fast. Water helps the kidneys eliminate waste.
• Improves concentration : Dehydration affects your mood, memory and focus.
• Prevents headaches : One of the most common fasting side effects is headaches, often due to lack of water.

In short—water is your best mate while fasting.

There’s no one-size-fits-all answer, but the NHS recommends around 6–8 glasses of fluids a day—and this includes water, low-fat milk, and sugar-free drinks.

However, when fasting, especially during extended periods or hot weather, you may need more.

Keeping up your fluid intake isn’t always easy—especially if you’re not eating. Here are some practical tips:

Add slices of lemon, cucumber or mint to make it more interesting. As long as there’s no sugar, it won’t break your fast.

Especially in warmer months, cold water can feel more refreshing and reduce the urge to snack.

Set hourly reminders to take a few sips—especially useful if you’re busy or forget easily.

So, can you drink water while fasting? Yes—unless you’re dry fasting, drinking water is not only allowed but highly encouraged.

Staying hydrated helps reduce hunger, supports your body’s natural detox processes, and keeps your energy levels up. Whether you’re doing the 16:8 method, preparing for Ramadan, or just trying out a new health routine, make water your best ally.

Just remember:

• Stick to plain water or non-caloric beverages.
• Avoid sugary or milky drinks that could break your fast.
• Listen to your body and stay consistent with hydration.

If you’re new to fasting or have health conditions, it’s always wise to consult your GP or a nutritionist before diving in.

Stay safe, stay hydrated, and happy fasting!