Is it okay to drink pineapple juice when fasting?

Fasting has become an increasingly popular way for people to improve their health, lose weight, and simplify their lifestyles. During a fast, people abstain from eating food for a set period of time. Water is allowed, but the rules around other beverages like fruit juice vary depending on the type of fast.

What is fasting?

Fasting is the practice of voluntarily abstaining from some or all food and drink for a period of time. People fast for religious, spiritual, health, or weight loss reasons. Here are some common types of fasting:

  • Water fast – Consuming only water and no food at all
  • Juice fast – Consuming only fruit and vegetable juices
  • Intermittent fasting – Alternating between periods of fasting and normal eating
  • Time-restricted feeding – Limiting eating to a specific number of hours per day

Fasting allows the body to take a break from digestion and focus on other processes like removing toxins and healing itself. Short term fasts are generally considered safe for most healthy individuals.

Benefits of fasting

Research shows that fasting offers a variety of health benefits:

  • Promotes weight loss – Fasting leads to calorie restriction which can help lose excess fat.
  • May extend lifespan – Animal studies link fasting to longevity.
  • Lowers blood pressure – Fasting was shown to significantly reduce blood pressure.
  • Reduces inflammation – Markers of inflammation decreased during repeated fasting.
  • May prevent type 2 diabetes – Fasting resulted in better blood sugar control.
  • Boosts brain function – Fasting led to increased levels of BDNF, a protein involved in brain health.

In addition to physical benefits, many people find that fasting also improves their mental clarity and focus.

Rules around beverages when fasting

One of the key questions around fasting is whether it is okay to drink anything other than plain water. Here are some general guidelines:

  • Water – Allowed during all types of fasting. Hydration is essential.
  • Black coffee & tea – Allowed during most fasts but may stimulate hunger.
  • Broth – Often allowed during more flexible fasts but contains calories.
  • Juice – Only allowed on specific juice fasts, not water or intermittent fasts.
  • Milk – Not allowed on most fasts due to calories and nutrients.
  • Soda & energy drinks – Not allowed; contain sugar and artificial ingredients.
  • Alcohol – Not allowed; provides empty calories without nutrition.

The key is to avoid any beverages with significant calories, nutrients, or artificial ingredients that could stimulate insulin secretion or disrupt the fasting state. Plain water is universally accepted.

Is pineapple juice allowed when fasting?

In general, pineapple juice is not recommended when fasting. Here are a few reasons why:

  • High in natural sugar – One cup contains over 25g of sugar. This could raise insulin levels.
  • Significant calories – One cup provides 130 calories, which breaks a fasted state.
  • Nutritional content – Pineapple juice has vitamins, minerals, and antioxidants that need to be metabolized.
  • Fiber removed – Juice eliminates the fiber content present in whole pineapple.

For these reasons, pineapple juice is not permitted on water fasts, intermittent fasting, or most other types of fasts. An exception could be a fruit and vegetable juice fast that allows unsweetened pineapple juice in moderation. But it would still promote higher insulin secretion than vegetable juice.

Better beverage options while fasting

So what should you drink instead of pineapple juice when fasting? Here are some better options:

Beverage Reasons It’s a Good Option
Water Zero calories, hydrates without affecting fasted state
Black coffee Minimal calories, provides energy and antioxidant benefits
Green tea Zero calories, provides antioxidants to protect cells
Sparkling water No calories, flavors can help satiety
Diluted apple cider vinegar Minimal calories, may boost metabolism and burn fat
Bone broth Some calories but provides electrolytes
Vegetable juice Some calories but highest in nutrients, low sugar

Focus on unsweetened options that provide maximum nutrition and health benefits without disrupting your fasted state. Herbal teas, mineral water, broths, and diluted juices in moderation can add variety.

Healthier ways to consume pineapple when fasting

Even though pineapple juice may not be advisable during fasting windows, there are other ways to enjoy the benefits of pineapple when you are not fasting:

  • Eat fresh pineapple – Provides fiber, vitamins, enzymes, and antioxidants.
  • Drink unsweetened pineapple water – All the flavor without the concentrated sugar.
  • Add pineapple to smoothies – Blend with spinach, protein powder, etc. for balanced nutrition.
  • Make pineapple infused water – Helps hydrate and adds tropical flavor.
  • Use frozen pineapple in recipes – Add to yogurt bowls, chia pudding, overnight oats.

Pineapple is a very healthy fruit loaded with manganese, vitamin C, copper, and fiber. By consuming it whole or infused into water, you can get its benefits without disrupting your fast.

Potential dangers of drinking pineapple juice while fasting

Drinking juice high in sugar and calories like pineapple juice while fasting could jeopardize many of the health benefits. Here are some potential dangers:

  • Spike in insulin – The natural sugars in the juice spike insulin, inhibiting ketosis.
  • Reduced fat burn – The calories provide fuel for your body, reducing fat burn.
  • Increased hunger – The juice may stimulate appetite, making fasting more difficult.
  • Blood sugar crash – You may experience an energy crash when the fruit sugar wears off.
  • Lack of fasting benefits – Your body may not enter into a fully fasted state.
  • Nutrient imbalance – Juice eliminates the fiber that balances out the sugars.

To get the most out of your fast, avoid drinking high-calorie, sugary beverages like pineapple juice. Stick to plain water, unsweetened teas, black coffee, and at most small amounts of low-sugar vegetable juice for optimal health benefits.


Pineapple juice is not the best choice when fasting due to its high sugar and calorie content. Consuming pineapple juice could potentially negate many of the health and weight loss benefits associated with fasting. Water, black coffee, plain tea, sparkling water, diluted ACV, and low-sugar vegetable juices are better options that preserve a fasted state. The natural sugars and calories in pineapple juice are likely to raise insulin levels and reduce fat burning.

However, you can still enjoy the nutritional benefits of pineapple when you are not fasting by consuming it fresh, adding it to smoothies, or infusing water with it. Overall, pineapple juice is not recommended when following an intermittent, water, or other fast. Stay hydrated and motivated by opting for unsweetened, low-calorie beverages instead.

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